Power Splitter to Graphics card from psu

[Shawn]

My psu only has 2 spare female 4 pin molex cords. my graphics card came with a 2x6 pin pci to 4 male 4 pins. Would I be able to just put 2 Way 4 pin PSU Power Splitter Cable between the two cords to make up for the lack of molex's on my psu. would this cause a problem in amperage and voltage. don't know about that stuff but dont want to fry the innards of our computer.

This is the computer i'm working with

CyberpowerPC Gamer Ultra GUA250 AMD FX-4100

I'm upgrading the stock gfx card from gt520 to gtx560. The gtx560 only need 450 my psu supports 500. Shouldnt be a problem. Thoughts? I think this is called daisy chaining correct me if im wrong. Someone has told me that my graphics card would be unstable if i did that but why would that be?

[kalniel]

Total wattage on the PSU counts for nothing unfortunately, you need to know the amperage provided on the 12V rail(s) - this information will be listed in a table on the side of the PSU.

Wiring up the cables like that is possible, though you just need to check that you're not ending up using thin gauge wire for a high(ish) amperage - this is the main reason PCI-E cables are seperate from molex AFAIK.

[carvedeye]

+1

Definitely check the specs of your PSU, the molex cable(s) that came with the card you should just bin and get a decent PSU if you have not got one already.

[scaryjim]

The other consideration is power draw through plug. 6 pin PCIe can handle 75W, standard molex in only rated to (iirc) 60W - that's why the PCIe adapters are 2x molex to a single 6pin adapter (technically you can't draw enough power through a single molex).

If your existing PSU doesn't have any PCIe connectors then it's very unlikely to be of a good enough quality to run a gtx560. I wouldn't risk it and would buy a *good quality* 400W PSU (this will be plenty to run a rig with a single gtx560).

[Macadee]

Pre-built sytems usually skimp on the power supply to keep cost down and will be sized with no upgrades in mind.

Chances are you will need a new PSU also, best if you can find and post the details from the PSU info sticker on the side.