I have very little experience with a GPU that requires a PCI-E cable going directly into it , so at the moment i wired my desktop GPU (the GTX 680) with 2 of the 3 PCI-E cables i had coming from my PSU , this (i think) means it's running on 150W of the maximum 225W power input , i can run most modern games on full no problem on this build i have.
I was just wondering what sort of performance increase i would get (if any) by putting the full 225W into the GPU?
here's the full specs of my build if anyone needs them -
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor
Motherboard: Gigabyte GA-Z77-D3H ATX LGA1155 Motherboard
Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory
Storage: Seagate SV35.5 2TB 3.5" 7200RPM Internal Hard Drive
Video Card: Asus GeForce GTX 680 2GB Video Card
Power Supply: Corsair Builder 750W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply
When you install a graphics card you attach the exact power cables it call for. No less, and obviously you can't add more.
The GTX680 only has two power inputs so i don't know what you are talking about.
i should probably clarify...
my PSU has 3 output cables labelled PCI-E , each one being 6/8 pin connectors and from my understanding each one provides 75W , the way i have them connected to the GPU is one in the 6 pin slot , and one in the 8 pin slot (using one half of the PCI-E 2 x 6 pin to 1 x 8 pin splitter that came with the GPU) thus providing only 150W of the 225W rated
The splitter is combining two 6-pins to create an 8-pin.
Thus you are supplying 75W + 75W + 150W = 300W.
If I understand correctly you did NOT use both 6-pins for the adapter. You SHOULD DO THAT.
Your games won't run any better, but what's probably happened is you've been drawing just under 225W. There are scenarios where you would have CRASHED your PC because you weren't provding enough power.
1) Connect BOTH 6-pins to the 2x6-pin-> 8-pin adapter.
2) Games won't run faster. You're simply ensuring your PC won't crash under a more demanding GPU task.