What power supply do i need for 2 gigabyte gtx570 soc

[kevwal]

i've just bought 2 gigabyte gtx 570 soc cards & was wondering wot power supply i would need to run them efficiently. at present i am using a corsair 850hx is that enough or should i go to 1000watt, also my cpu has a moderate overclock "i7 2600k"

 

[beenthere]

This will help you sort it all out accurately.

As far as PSUs are concerned, be informed. Before you buy any PSU read accurate, objective PSU reviews at reputable sites such as www.jonnyguru.com or www.hardwaresecrets.com on the EXACT model PSU that you are interested in as some brands have good and poor quality PSUs.

You can also get an accurate rating of how much PSU power is required for your current or future system at the PSU calculator link below. Once you know the total PSU watts required then you need to confirm that the 12v rail has enough amps. to support your Vid card(s) and the rest of the PC system.

There are several websites that show the Vid card power consumption in watts. Divide the watts by 12 to determine the amps. required on the 12v rail(s). Add 15 amps for the rest of the PC on the 12v rail and you now know the Minimum total 12v rail amps required under full load. It's best to have at least 5-10 amps. reserve on the 12v rail available under full load so the PSU is not loaded to 100%.

It's also worth noting that people often misunderstand the 80% power rating. This is a rating of the PSU's energy efficiency not it's output. 80% plus PSUs use less grid power to produce the same PC power. If it's 80% Bronze, Silver or Gold the cost savings on electricity is pretty small between Bronze, Silver and Gold unless you are paying very high rates for electricity so any 80% rated quality PSU is fine even if not Gold. For those who leave their PC on 24/7 a quality 80% PSU is a good investment.


http://extreme.outervision.com/psucalculatorlite.jsp

http://www.guru3d.com/article/geforce-gtx-560-ti-sli-review/14

http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_560_Ti/25.html

 

[jsc]

I figure a pair of GTX570's will need about 40 amps. Figure another 10 amps for the CPU. That's about 600 watts. Add another 100 - 150 watts for motherboard, memory, and drives.

I estimate that your present PSU will be running at around 80 - 85% of rated capacity when under load. Personally, I'd prefer a little more headroom, but you should be OK.

 

[kevwal]

Thx guys looks like i'll be going with a 1000w psu prob stay with corsair