6770 power..


Jun 8, 2011
So I have 4 Options here with my problem. I'm trying to solve it.

I have 3 PSUs I can use ATM. (All pretty much such)
so PSU 1) 450 Watt 22A +12V Rail.
2) 200 Watt PSU +12V 10A
3) 180 Watt PSU +12V 17A

CPU-ID HWMonitor says the power draw is 176.0 Watts. I don't know if thats correct so I would like someone to verify that for me....

I am more than %100 I am going to buy a new PSU but thats in a few days and I want to test my card before to make sure its not DOA.

So here are my options from what I see:
1) Use the 450 Watt for the MOBO & GPU.
2) Use the 450 Watt for MOBO and 180 Watt for GPU
3) Use the 450 Watt for MOBO and 200 Watt for GPU

So which option should I go with.

PS: The 6-Pin converter I got with the card only uses 1 4-Pin Mollex.
My card: http://www.newegg.com/Product/Product.aspx?Item=N82E16814102941

My rig: 4 Sticks of DDR3 1333 (2x 2GB & 2 x 1 GB)
AMD Phenom X4 B55
1 5.4k RPM 2.5'' HDD
2 Case fans ( 120mm?)
1 COMBO Drive (PATA)
You must have an old or very crappy 450 Watt PSU, it's more like a 300 Watt unit at best. 22 Amps on the +12V rail is not likely going to be enough for your 6770 and the rest of your system. If you use a second PSU to help power your graphics card, that might just barely be adequate if you put your system under load, but you will be cutting it very close, your graphics card will still pull most of its power from the motherboard and your "450 Watt" power supply. The secondary power supply will only give your card the wattage needed above the 75 Watts pulled form the slot, which would be about 33 Watts for a 6770.

I strongly recommend that you get a new power supply before you try to use your 6770. Pushing old or crappy PSUs to their absolute limits is not a good idea, there is a risk that you could damage your components if one of your PSUs blows. Look for a good quality 400 or 450 Watt unit. Something in that category should have roughly 30Amps between its +12V rails. That will adequately power your system.