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Power Supplies

 

ATX Hot Swap Load Sharing Power Supplies

Part # Description Price

PS-PCPC-800X

PC Power and Cooling brand, Hot Swappable 800W Rev 2.01 ATX PS2 Power Supply 27-0301 HSR-5400A UL CSA TUV Heavy Duty Load Sharing with fail sensors for fan rotation and power supply failure. Professional Quality. 100KH MTBF, 20ms Hold Time VAC, 90-135 VAC or 180-270 VAC switchable, 47-63Hz, Efficiency 70%, Overload Protection 120%, PG Delay 300ms, Off 1ms, Line Regulation 1%, Power Regulation +/-5% (We don't know who makes this model)

$800

PS-ZIPP-800X

Zippy/Emacs RP2-5400F-RV2 (HSR-5400F-RV2) Hot Swappable 800W Rev 2.01 ATX PS2 Power Supply    UL CSA TUV Heavy Duty Load Sharing with fail sensors for fan rotation and power supply failure. Professional Quality. Editor's Choice for Redundant ATX PS!

$400

PS-ZIPP-800XF

Zippy/Emacs ARD-6400F/FRONT Hot Swappable 800W Rev 2.01 ATX PS2 Power Supply    UL CSA TUV Heavy Duty Load Sharing with fail sensors for fan rotation and power supply failure. Professional Quality. This power supply only fits in our 4U 5 Bay Rack Mount

$400

PS-PCPC-600X

PC Power and Cooling brand, Hot Swappable 300W Rev 2.01 ATX PS2 Power Supply UL CSA TUV Heavy Duty Load Sharing with fail sensors for fan rotation and power supply failure. Professional Quality. 100KH MTBF, 20ms Hold Time VAC, 90-135 VAC or 180-270 VAC switchable, 47-63Hz, Efficiency 70%, Overload Protection 120%, PG Delay 300ms, Off 1ms, Line Regulation 1%, Power Regulation +/-5% (We don't know who makes this model)

$390

PS-ZIPP-600X

Zippy/Emacs RP2-5300F-RV2 Hot Swappable 600W Rev 2.01 ATX PS2 Power Supply  CSA TUV Heavy Duty Load Sharing with fail sensors for fan rotation and power supply failure. Professional Quality.

$340

PS-ZIPP-600XF

Zippy/Emacs ARD-6300F/FRONT Hot Swappable 600W Rev 2.01 ATX PS2 Power Supply    UL CSA TUV Heavy Duty Load Sharing with fail sensors for fan rotation and power supply failure. Professional Quality. This power supply only fits in our 4U 5 Bay Rack Mount

$340

PS-500X

Zippy/Emacs MR2-6250F Mini Hot Swappable 500W (Dual 250W) Rev 2.01 ATX PS2 Power Supply  CSA TUV Heavy Duty Load Sharing with fail sensors for fan rotation and power supply failure. Professional Quality. Fits in our 2U 3-bay chassis  (2U3B $350)

$300

 

ATX Power Supplies

Part # Description Price

PS-618W

Potant 618W RPS618F Power Supply for Alpha MB264DP  designed specifically for the Alpha MB264DP dual processor motherboard, fits the Axxion Tl-22 chassis.

$700

PS-600W

600W Rev 2.01 ATX PS2 Power Supply OEM'd by PC Power. We carry this power supply for the Sparc AXMP motherboards. This model does not supports the DEC Alpha MB21264DP

$420

PS-ZIPPX-400W

Zippy/Emacs brand 400W Rev 2.01 ATX PS2 Power Supply made by Zippy/Emacs:  UL CSA TUV, Professional Quality. Zippy/Emacs Model AP2-5400F-RV2. See AP2 Specs, 100KH MTBF, 20ms Hold Time VAC, 90-135 VAC or 180-270 VAC switchable, 47-63Hz, Efficiency 70%, Overload Protection 120%, PG Delay 300ms, Off 1ms, Line Regulation 1%, Power Regulation +/-5% Editor's Choice for ATX PS!

$140

PS-PCPCX-400W

PC Power and Cooling brand 400W Rev 2.01 ATX PS2 Power Supply made by Zippy/Emacs:   UL CSA TUV, Professional Quality. Zippy/Emacs Model AP2-5400F-RV2. See AP2 Specs, 100KH MTBF, 20ms Hold Time VAC, 90-135 VAC or 180-270 VAC switchable, 47-63Hz, Efficiency 70%, Overload Protection 120%, PG Delay 300ms, Off 1ms, Line Regulation 1%, Power Regulation +/-5%

$180

PS-SPI-400W

Sparkle / SPI / PowerMan  FSP400-60GT/I 400W ATX Rev 2.01 Power Supply made by SPI: 100KH MTBF, 16ms Hold Time, 90-132 VAC or 180-264 VAC switchable, 48Hz to 63 Hz, Efficiency 65-70%, Overload Protection 150%, PG Delay 100-500ms, Off 1ms, Line Regulation 1%, Power Regulation +/-5%. 

$100

PS-SPI-350W

Sparkle / SPI / PowerMan  FSP350-60GT/I 350W ATX Rev 2.01 Power Supply made by SPI: 100KH MTBF, 16ms Hold Time, 90-132 VAC or 180-264 VAC switchable, 48Hz to 63 Hz, Efficiency 65-70%, Overload Protection 150%, PG Delay 100-500ms, Off 1ms, Line Regulation 1%, Power Regulation +/-5%. 

$90

PS-PCPCX-300W

PC Power and Cooling brand, SPI FSP300-60GT 300W ATX Rev 2.01 Power Supply made by SPI: 100KH MTBF, 16ms Hold Time, 90-132 VAC or 180-264 VAC switchable, 48Hz to 63 Hz, Efficiency 65-70%, Overload Protection 150%, PG Delay 100-500ms, Off 1ms, Line Regulation 1%, Power Regulation +/-5%. 

$120

PS-SPI-300W

Sparkle / SPI / PowerMan  FSP300-60GT/I 300W ATX Rev 2.01 Power Supply made by SPI: 100KH MTBF, 16ms Hold Time, 90-132 VAC or 180-264 VAC switchable, 48Hz to 63 Hz, Efficiency 65-70%, Overload Protection 150%, PG Delay 100-500ms, Off 1ms, Line Regulation 1%, Power Regulation +/-5%. 

$80

PS-G-300W

Generic 300W ATX Rev 2.01 Power Supply 

$70

PS-SPI-250W

Sparkle (SPI OEM Power Man) 235W or 250W FST235-60GT or FST250-60GT Series ATX Rev 2.01 Power Supply (Personal Quality) 100KH MTBF. For ATX Pentium Only.

$50

PS-G-230W

Generic 230W-250W ATX Rev 2.01 Power Supply 

$35

 

ATX 1U Power Supplies

Part # Description Price

MPW-6230F

Zippy/Emacs brand 230W Rev 2.01 ATX PS2 Power Supply made by Zippy/Emacs:  UL CSA TUV, Professional Quality. Zippy/Emacs  See Specs, 100KH MTBF, 20ms Hold Time VAC, 90-135 VAC or 180-270 VAC switchable, 47-63Hz, Efficiency 70%, Overload Protection 120%, PG Delay 300ms, Off 1ms, Line Regulation 1%, Power Regulation +/-5%

$160

MPW-6200F

Zippy/Emacs brand 200W Rev 2.01 ATX PS2 Power Supply made by Zippy/Emacs:  UL CSA TUV, Professional Quality. Zippy/Emacs  See Specs, 100KH MTBF, 20ms Hold Time VAC, 90-135 VAC or 180-270 VAC switchable, 47-63Hz, Efficiency 70%, Overload Protection 120%, PG Delay 300ms, Off 1ms, Line Regulation 1%, Power Regulation +/-5%

$150

MPW-6180F

Zippy/Emacs brand 180W Rev 2.01 ATX PS2 Power Supply made by Zippy/Emacs:  UL CSA TUV, Professional Quality. Zippy/Emacs  See Specs, 100KH MTBF, 20ms Hold Time VAC, 90-135 VAC or 180-270 VAC switchable, 47-63Hz, Efficiency 70%, Overload Protection 120%, PG Delay 300ms, Off 1ms, Line Regulation 1%, Power Regulation +/-5%

$140

MPW-6150F

Zippy/Emacs brand 150W Rev 2.01 ATX PS2 Power Supply made by Zippy/Emacs:  UL CSA TUV, Professional Quality. Zippy/Emacs  See Specs, 100KH MTBF, 20ms Hold Time VAC, 90-135 VAC or 180-270 VAC switchable, 47-63Hz, Efficiency 70%, Overload Protection 120%, PG Delay 300ms, Off 1ms, Line Regulation 1%, Power Regulation +/-5%

$140

 

AT Power Supplies

Part # Description Price

PS-ZIPP-800A Sale

Zippy/Emacs Hot Swappable 800W Rev 2.01 AT PS2 Power Supply    UL CSA TUV Heavy Duty Load Sharing with fail sensors for fan rotation and power supply failure. Professional Quality. Editor's Choice for Redundant AT PS! Sale price limited to stock normally $440!

$300

PS-ZIPP-600A

Zippy/Emacs Hot Swappable 800W Rev 2.01 AT PS2 Power Supply    UL CSA TUV Heavy Duty Load Sharing with fail sensors for fan rotation and power supply failure. Professional Quality. (Professional Quality)

$390

PS-ZIPP-400W

Zipply Emacs or SPI 400W AT PS2 Power Supply 14-0012 SP2-4400F UL CSA TUV (Professional Quality)

$150

PS-ZIPP-350W

Zipply Emacs or SPI 350W AT PS2 Power Supply 22-0009 SP2-4350FI UL CSA TUV (Industrial Quality)

$130

PS-ZIPP-300W

Zipply Emacs or SPI 300W AT PS2 Power Supply UL CSA TUV (Professional Quality)

$110

PS-G-300W

Generic AT 300W (Personal Quality)

$ 50

PS-G-250W

Generic AT 250W (Personal Quality)

$ 40

 

AT and ATX DC-to-DC Converters -48V
These are typically used in computers for telecom, industrial automation and aviation applications requiring a direct connection to a -48V DC battery source.

Part # Description Price

PS-ZIPP-DD2-300

Zippy/Emacs brand 300W ATX PS2 Power Supply made by Zippy/Emacs:  UL UL+C FCC TUV, Professional Quality. Zippy/Emacs Model DD2-6300F. See DD2 Specs, Dimensions: 150mmX149mmX86mm (LxWxH)

$200

PS-ZIPP-DD2-300

Zippy/Emacs brand 300W AT PS2 Power Supply made by Zippy/Emacs:  UL UL+C FCC TUV, Professional Quality. Zippy/Emacs Model. See DD2 Specs, Dimensions: 150mmX149mmX86mm (LxWxH)

$190

PS-ZIPPX-DD2-250

Zippy/Emacs brand 250W AT PS2 Power Supply made by Zippy/Emacs:  UL UL+C FCC TUV, Professional Quality. Zippy/Emacs Model DD2. See DD2 Specs, Dimensions: 150mmX149mmX86mm (LxWxH)

$170

 

Technical Considerations

Index

Choosing the Best Quality ATX Power Supply

If you are looking for the highest quality ATX 400W power supply on the market we whole heartedly endorse the Zippy/Emacs AP2-5400F-RV2 400W model. The Zippy/Emacs AP2-5400F-RV2 400W power supply is resold by PC Power and Cooling under the brand name Turbo Cool 400. It is also relabeled and sold by California PC Products as their new 400W power supplly. All three power supplies are identical except for the label.  Zippy USA, Inc. (Shin Jiuh Corp of Taiwan) has a long established history in the power supply business.  US Power & Technology Corporation (USP&T) of El Paso, Texas, established in 1968, originally resold Emacs Power Supplies made by Zippy USA, Inc.  US Power oversaw their own production facility in Taiwan and did final product assembly, custom OEM modifications, and quality control operations in their El Paso facilities. In 1998 US power went out of business. However, the same folks are now running Magtech (915)774-0066.  Two of their former customers included California PC Products of Hollister, CA, and PC Power and Cooling of Carlsbad, CA. However, due to recent quality control issues with  Magtech power supplies, both California PC Products  and PC Power and Cooling have ceased resale of Magtech 400W ATX power supplies and switched to the  Zippy/Emacs AP2-5400F-RV2 400W model. Zippy/Emacs also makes a 300W ATX model, the AX2-5300F(B), which is currently under evaluation.

Another innovative company is the FSP Group. The FSP Group was formed in 1994 as a merger of Fortron\Source Co. Ltd. (SFS) of Taiwan, established in 1989 and Sparkle Power International (SPI) founded in 1993. The FSP Group has a 1,000,000 unit per month power supply production capacity with over 700 workers at its Factory 3 in Shenzeng, China.  The FSP Group makes high quality 235W, 250W, 300W and 350W ATX power supplies with a MTBF of 100,000 hours. FSP Group produces the FSP-300-60GI 300W ATX power supplies which is resold under the brand name PowerMan and bundled with the full tower In Win chassis. The FSP-300-60GI vents air into the chassis from the rear. In contrast, FSP Group's FSP-300-60GT model exhausts air from the chassis to the rear. FSP Group's FSP-300-60GT is now resold by PC Power and Cooling as the new Turbo Cool 300 and by California PC Products as their new 300W power supplly.

A final company worth review is Enermax who also makes good quality power supplies. For a comprehensive listing of ATX Power Supply manufacturers and OEM's see the official ATX power supply page.

The Basics of Power

An ATX power supply converts 7 amp, 110 volt, 60Hz alternating current (AC) into +5V, +12V, -5V, -12V and +3.3V direct current (DC). (4 amp, 220 volts at 50Hz is used in most locations outside the US). For this task one transformer is used for the 12V rail while a second transformer is used for the 5V and 3.3V rails. The +5V rail wire is generally red and supplies power to the motherboard and expansion cards. The +12V rail wire is yellow or red and supplies power to CD-ROM's hard disks and other devices with moving parts such as fans. +12V is also supplied to the ISA bus for ISA cards that may require it. Generally the -12V (blue) and -5V (white) rails are no longer used. In ATX power supplies an orange 3.3V lead is provided for low voltage P5 and P6 processors. Older AT power supplies lack the 3.3V rail. AT motherboard obtain the 3.3V from the +5V rail using an on board passive voltage regulator or switch regulator.  This is more expensive so newer ATX power supplies provide a 3.3V rail directly from the power source. Black is ground. Finally, a gray "Power Good" rail is used to confirm a sufficient load is present.

+5V Standby and ATX Power-Up

In addition, ATX power supplies provide a "+5V Standby" (+5Vsb) rail which is generally purple. (Note this is not the same as the normal +5V power lead) generated by a solenoid relay which is directly connected to the AC input bypassing the main transformer. This lead is always powered on even if all other rails are off. This allows certain circuits in the motherboard to remain active even when power supply is off. The +5V standby rail is used for software mediated power up of the system. The software power-up may be triggered by activity of the modem or network card or it may be activated at a predetermined time. A green "Power On" lead is used by the motherboard to signal the power supply to turn on. 

Older revision 2.0 ATX power supplies used a 0.01 amp +5Vsb rail. As of late 1997 revision 2.01 ATX power supplies have switched to a 0.750 amp or greater +5Vsb terminal. Mixing power supplies and motherboards with different revisions is a common cause of power-on and power-off problems.

MTBF in Hours

Mean Time Before Failure (MTBF): This is a statistical measure of the number of thousands of hours before the mean (average) unit failure. If a power supply has a 30,000 hour MTBF (~11.4 years) then a set of 30 power supplies have been run for 1,000 hours and only a single failure occured during this period. Note this means that the combined total life of all 30 power supplies was 30,000 hours (1,000 hours times 30 power supplies)  before the first power supply failed. The MTBF is the sum of the number of hours of all of the power supplies tested, not the life of each power supply.

MTBF means very little if you don't know the duty cycle. The duty cycle is the fraction of hours the device was actually in use during the testing period. Some manufactuters list a 100% duty cycle which means they are testing the power supplies by running them 24 hours a day 7 days a week (168 hours per week) non-stop. Others might use a 24% duty cycle which means they are testing them for a normal 40 hour work week: 5 days a week times 8 hours a day. So for example, a 100,000 hour MTBF unit tested on a 24% duty cycle actually has only a 24,000 hour MTBF on a 100% duty cycle. The device was actually only powered on for 24,000 hours. Note that MTBF values are generally rounded up to the nearest 10,000 hours or 100,000 hours for things like hard disks. A more useful measure is the MTBF for the total "Power On Hours" (POH). It is not uncommon for a good power supply to have a MTBF of 30,000 POH (~3.4 years) and a 1.25% failure per 1,000 hours of operation.

Mean Cycles Before Failure (MCBF) is the number of times the unit can be turned on and off before a mean failure in the population tested. In a good power supply this value is about 10,000.  

Finally, manufacturers can fudge figures a lot by using a lower or higher temperature for their testing. Generally the lower the termperature used the higher the MTBF one can obtain. Generally MTBF is tested at 25C. 

Hold Time VAC in ms

Hold Time VAC: This is the amount of time a power supply will continue to produce ample DC current to your computer after a power failure. 15-20ms is considered excellent. Low quality power supplies will have a hold time of 2-4ms. This may be important if you plan to use a dumb UPS that may not immediately "kick-in." However, all good quality smart UPS should yield a continuous stream of AC power without interruption so the hold time will not be critical in this case. However, this could be important if you do not use any sort of UPS and your power supply is subject to many gray outs.  

VAC Ranges and Frequency Ranges

VAC and Frequency Range: The AC Voltage range that is allowed for input to the PS. Typically the AC Voltage ranges from 90-135 VAC (US) or 180-270 VAC (Europe) and is switchable. Likewise a range of frequency values is acceptable, commonly 47-63Hz. A larger range is a good thing. This value is only important if you have a power source that deviates from the normal specifications.

Efficiency

Efficiency: The efficiency with which the PS converts AC to DC current. Typically this is 70%. 

Overload Protection

Overload Protection: This value lists the maximum that DC output is allowed to vary. Lower is good. Good values are 120%-150%.

Power Good (PG) Delay and Off Delay

Power Good (PG) Delay and Off Delay: It takes a power supply at least 100ms to completely power up before it can offer the proper DC voltages to the computer. The computer will not attempt to turn on until the power supply is finished powering up and sends a Power Good (PG) signal to the motherboard via a PG terminal. On power up the Power Good (PG) terminal is polled for a brief period before the PC turns on to check the status of the power supply. Only after the +5V and +3.3V rails are above threshhold does the PG signal go "high." The PG signal stays on until the PC is ready to power off. The period of delay between switching on the PS and the actual application of power is the PG delay. Typical values are 100-300ms. The PG delay of the power supply should roughly match the PG delay specification of the motherboard or power on problems may occur. When shutting off the PS a delay of about 1ms is required. This is called the Off delay.

The PG  signal is generated by the +5V terminal plus a 10K resister. Frequently the PG terminal is attached to a watch dog timer card. The watch dog timer card will issue and alert if the power supply goes down. 

Power Regulation

Power Regulation: The allowable range of the +5 and +12V amperage. A good PS typically has a +/-10% error margin or better.

Calculating the Power Consumption of a PC

You can not buy a power supply with too much power. Excess power will merely not be generated if not required. However, It is critical to supply enough power (Watts) to your computer components.  The total power output in Watts (W) is merely the product of the Voltage (V) and the current (Amps). A typical 300W power supply will have the following values: 

DC Output of a 25Amp, 300W rev 2.01 ATX Power Supply

Voltage V DC

+3.3 Orange

+5 Red

+12 Yellow

-12 Blue

-5 White

+5Vsb Purple

Current (Amps)

14

30

12

.6

.3

.8

As noted above the negative voltages are not used anymore. The key voltages to look at are the +5V, +3.3V and +12V outputs. The specifications for each component in your PC will list the total number of Amps it consumes for each type of voltage terminal. You can find these values on the manufacturer's WWW sites. To calculate the number of Watts consumed per terminal multiply the number of amps times the voltage for that terminal, then sum the resulting values. For example, lets calculate the number of Watts consumed by a Cheetah 18GB hard disk. He is the data we need:

Description Amps (+12v) Amps(+5v) Amps(+3.3v) Watts
Cheetah 18GB Hard Disk 2.9 0.9 0 39.3

Calculate the number of Watts consumed as follows:

Number of Watts = (2.9A x 12V) + (0.9A x 5V) = 39.3W

Create a table listing these values for each component in your computer. You may find it easier to create this table in a spreadsheet. Tabulate the +12V amps used in one column and the +5V amps in a second column, the +3.3V amps used in a third column. In the last column list the total Watts consumed. Here is an example for a typical high end system:

Component

Amps (+12v)

Amps (+5v)

Amps (+3.3v)

Total Watts 

Max Value (From Power Supply Spec)

12

30

14

340.2

Cheetah 18GB Hard Disk

2.9

0.9

0

39.3

Toshiba SCSI CD-ROM

1.5

1

0

23

BusLogic 958 PCI SCSI Controller

0.5

5

7.6

56.08

SoundBlaster AWE64 ISA

0.175

2

0

12.1

Matrox Millennium II PCI

0.5

5

7.6

56.08

NetGear PCI Network Card

0.5

5

7.6

56.08

Intel CPU Fan

0.1

0

0

1.2

Sunon Chassis Fan

0

0.3

0

1.5

Sunon Chassis Fan

0

0.3

0

1.5

Teac Floppy Drive

0

1

0

5

CalPC Bay Cooler Fans

0

0.3

0

1.5

ASUS P2B Motherboard w/128MB RAM and 266MHz CPU

1

7

0

47

Total Consumed (Calculated Sum)

7.175

27.8

22.8

300.34

You should not exceed the amp ratings for the individual voltage supply nor the total Watts.

Note that to calculate the amount of power used by an expansion card use these standard values which are the maximum power consumption in Amps per bus slot per the design specification of each bus respectively. Note that your card will probably consume less power than these maximal values:

Bus Type +12v power +5v Power +3.3v Power Watts
ISA 0.175 2 0 12.1
EISA 1.5 4.5 0 40.5
VL-Bus 0 2.0 0 10.0
PCI 0.5 5.0 7.6 56.1
AGP Up to 9.2 0 Up to 7.6 25-110W

Different cards will consume different amounts of power. If in doubt use the maximum value. Note that an AGP can consume up to 9.2A on the +12V rail and up to 7.6A on the +3.3V rails. However, the total consumption can not exceed 110W. This has been a problem for some motherboard/graphics card combinations like the Riva TNT which draws 6A from the 3.3V rail and the older P2L97 motherboards which only provide 3A on the 3.3V rail.  For more information on AGP visit the AGP Forum at: http://www.agpforum.org/. For more information on PCI cards see the PCI Special Interest Group at: http://pcisig.com/.

Note that the values we have calculated are actually an overestimate. We have calculated the maximum theoretical power that each expansion card can consume. The actual cards will consume less, probably half as much. We have also calculated the maximum consumption values for the disks assuming all will be at peak activity simultaneously. We can see from these values that the choice of a high end 300W power supply is adequate for our sample system.

If you plan to build a dual Xeon system you should use a 400W power supply. Each 400MHz 512K Xeon processor will use 30.8W. The 400MHz 1MB Xeon will use 38.1W. The 450MHz 512K Xeon will use 34.5W.  The max plate cover temperature is 75C. For information on Xeon power consumption see: http://developer.intel.com/design/pentiumii/xeon/datashts/

Motherboard Connector Pinout

 

Motherboard Connector Pinout

Pin

Color

Output

1

Orange

+3.3V DC

2

Orange

+3.3V DC

3

Black

GRND

4

Red

+5V DC

5

Black

GRND

6

Red

+5V DC

7

Black

GRND

8

Gray

POK

9

Purple

+5V DC

10

Yellow

+12V DC

11

Orange

+3.3V DC

12

Blue

-12V DC

13

Black

GRND

14

Green

PS – ON

15

Black

GRND

16

Black

GRND

17

Black

GRND

18

White

-5V DC

19

Red

+5V DC

20

Red

+5V DC

 

Peripheral Device Pinout

 

Pin

Color

Output

1

Yellow

+12V DC

2

Black

GRND

3

Black

GRND

4

Red

+5V DC

 

Manufacturer WWW Links

Zippy/Emacs
Joyance MA Power
Axxion ASUS/Elan Vital
Elma In Win
Enlight Topower
Chenbro Other ATX Chassis Vendors

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