gtx 460 12v rail ?

[hardbg123]

So i have a 500w thermal master PSU.
The problem is that it supports only 20a on the 12v rail.
Here are all the specs:
+12v rail- 20a
+5v rail- 30a
+3.3v rail- 30a
-12v rail- 0.5a
5vsb- 2a
500w.

Also the other option for gpu is the gtx 560 ti.
P.S. i have 1 6 pin and i plan on using 2xmolex to 1x6 pin to power the gpu.

 

[WyomingKnott]

What is your question? Do you want to know the best graphics card that you can push with that PS, or do you want a new PS that will run that card?

IMHO, do not ever use a 2x Molex to 6-pin GPU power. You invite a fire. The PS is not designed to provide that power. I strongly suggest that you get a new PSU that can handle whatever graphics card you are going to need.

 

[hardbg123]

What is your question? Do you want to know the best graphics card that you can push with that PS, or do you want a new PS that will run that card?

The question is can i power the gtx 460 or gtx 560 ti with that psu.

 

[TJ Hooker]

That "500W" PSU can only supply 240W on the 12V rail. That's pretty bad. I would not recommend installing any card that requires any power connectors with that PSU. Definitely don't start using adaptors to get around your lack of power connectors.

The question is can i power the gtx 460 or gtx 560 ti with that psu.

No.

 

[WyomingKnott]

No, you cannot. You need a power supply with 2x 6-pin PCI connectors to be safe. If the PS does not have them, then it is not designed to power the card and you have a fire hazard.

 

[Susquehannock]

Many cards are shipped with two 4-pin molex to 6-pin adapters. Are these manufactures intentionally causing fires? Probably not.

A single 4 pin peripheral (aka-molex) using 18-ga wire is capable of 60w on the 12v side. Double that for the aforementioned adapter, it can supply more than enough for the 75w 6-pin PCIe.

Anyway ... that PSU does seem inadequate given it's specs.

 

[TJ Hooker]

Many cards are shipped with two 4-pin molex to 6-pin adapters. Are these manufactures intentionally causing fires? Probably not.

A single 4 pin peripheral (aka-molex) using 18-ga wire is capable of 60w on the 12v side. Double that for the aforementioned adapter, it can supply more than enough for the 75w 6-pin PCIe.

I don't think the concern is that you'll burn out the wires. When people recommend against using adaptors, it's because if a PSU doesn't have a given number of power connectors, it probably isn't cut out to power a GPU that requires that number of power connectors. Just as a general rule of thumb.

 

[Susquehannock]

^^ quite true. Thinking a PSU with single 12v rail of that amperage might be old. At least in design.