A Compatible Power Supply Unit to Replace Original?

[Petros_K]

When replacing a power supply unit, if the new unit says it has a 20-pin connector for the motherboard, will all 20-pin connectors fit the same way?

I've got an old Compaq EVO D310. Original power supply unit:
model: DPS-250RB A
220 Watts
20 PIN (motherboard connector)
1 x 4-Pin CPU Power Connection
4 x 4-Pin Molex
2 x Floppy Disk Driver Power Connection
+3.3V@15A, +5V@11A, +12V@5A, +12.8V@7.5A, -12V@0.15A, +5VSB@3A
Motherboard parts diagram is here: http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c00571576/c00571576.pdf


I want to replace it with this:
model: HEC 350W Power Supply - 80+ Bronze (HEC-350TA-2RK)
350 Watts
1 x 20
1 x 4-Pin Main Connector
2 x 4-Pin Molex
1 x Floppy
4 x SATA
+3.3V@21A, +5V@15A, +12V1@14A, +12V2@14A, -12V@0.3A, +5VSB@2.5A

Not sure what these specs mean, e.g., +3.3V@15A vs +3.3@21A. Is this about efficiency more or less?

Unit size: These are both labeled as ATX form factor, but I'm not sure if the HEC power supply unit is the right size for the original EVO D310 case.

 

[toyftw]

When replacing a power supply unit, if the new unit says it has a 20-pin connector for the motherboard, will all 20-pin connectors fit the same way?

I've got an old Compaq EVO D310. Original power supply unit:
model: DPS-250RB A
220 Watts
20 PIN (motherboard connector)
1 x 4-Pin CPU Power Connection
4 x 4-Pin Molex
2 x Floppy Disk Driver Power Connection
+3.3V@15A, +5V@11A, +12V@5A, +12.8V@7.5A, -12V@0.15A, +5VSB@3A
Motherboard parts diagram is here: http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c00571576/c00571576.pdf


I want to replace it with this:
model: HEC 350W Power Supply - 80+ Bronze (HEC-350TA-2RK)
350 Watts
1 x 20
1 x 4-Pin Main Connector
2 x 4-Pin Molex
1 x Floppy
4 x SATA
+3.3V@21A, +5V@15A, +12V1@14A, +12V2@14A, -12V@0.3A, +5VSB@2.5A

Not sure what these specs mean, e.g., +3.3V@15A vs +3.3@21A. Is this about efficiency more or less?

Unit size: These are both labeled as ATX form factor, but I'm not sure if the HEC power supply unit is the right size for the original EVO D310 case.

Hi - ATX PSU's are std width & height, the length (depth) can vary, but not normally an issue. Would have to be a very small case.
Of bigger concern is replacing it with an HEC PSU. HEC is a low quality PSU mfg.

Those specs you refer to don't have anything to do with efficiency, they are power specs, and you need not be concerned with the +3.3v & the +5v, almost all PSU's have more than enough amps for those rails, as so little is
drawn from them. They key spec is the +12v rail(s) amps. The CPU, GPU, HDD, etc draw their current form
the +12v rail(s).

So, if you have not already purch the HEC unit, please select a different brand. Antec, Most Corsair, Seasonic, XFX,
Rosewill Capstone, most Silverstone, Enermax, and a few others.

 

[Petros_K]

What about the 20-pin connector? How will I know if it fits my Compaq motherboard? Are all these connectors the same?

What specifically is wrong with this unit made by HEC? http://hecgroupusa.com/products/switching-power-supply/atx-12v/hec350ta/

If you look at the specs for the HEC unit, it's got to be able to handle more power demand than my existing 220 watt unit that was made in China for Compaq more than 10 years ago.

(I am not using the system for gaming.)