Will my PSU be ok for this graphics card??

I run a Corsair HX620 in my box and I have been very impressed and satisfied with this power supply. I don't think after using a modular power supply that I would ever go back to a non-modular power supply for my home machine. Keeping the wiring neat and tidy is a key element to a nice computer for me.

Fumz said:

Don't be deceived by PSU's that claim to have dual, triple and quad +12 volt rails; they're not. Yes, true dual rail PSU's exist, but they're rare, hard to find and a bit pricey. What you'll most often find is that the manufacturer has simply "split" the +12 volt rail. This isn't optimal because once slit, power cannot move back and force between rails if the system needs it... your conclusions were correct.

I'm not sure that I buy that. People used to have trouble with the way some multi-rail PSUs were wired, when trying to use a pair of high-power graphics cards in SLI.

SLI and CrossFire Push Power Supplies to the Limit - CPUs, Boards & Components by ExtremeTech

I think that multiple small voltage regulators may be cheaper than one high-capacity one.

A 9400GT needs no external power, and consumes less than 40W max, so I'm pretty sure that it would operate in grx's system.

I have no idea whether a game like GRID would run tolerably at any settings on grx's system, with the upgraded GPU. Adding a $100+ PSU to permit adding a $40 graphics card sounds like a poor bargain.

bobkn said:

Fumz said:

Don't be deceived by PSU's that claim to have dual, triple and quad +12 volt rails; they're not. Yes, true dual rail PSU's exist, but they're rare, hard to find and a bit pricey. What you'll most often find is that the manufacturer has simply "split" the +12 volt rail. This isn't optimal because once slit, power cannot move back and force between rails if the system needs it... your conclusions were correct.

I'm not sure that I buy that. People used to have trouble with the way some multi-rail PSUs were wired, when trying to use a pair of high-power graphics cards in SLI.

So what's all this rubbish about multiple 12 volt rails?