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How much extra power does OCing 2 GTX 460's take?

I am planning to run 2 EVGA 460 SE's in SLI and overclocking them. I already have one SE. Wish I had the regular one but I'll have to work with what I have. I have an Antec Earthwatts 650 watt power supply.
I was wondering if i were to overclock the speeds using the EVGA precision tool to maybe these speeds: (I pulled them off hardware canucks review) How much more power would doing the OC draw, in comparison to stock settings?

Graphics Clock: 851Mhz
Processor Clock: 1702Mhz
Memory Clock: 3980Mhz (QDR)

I know that 650 watts alone is cutting it close, so will overclocking these two cards in SLI be too much for my power supply to handle? If the above is too aggressive than maybe a little bit less would work? This is what else i have on my comp

i7-950 (no OC)
Asus Sabertooth X58
Corsair 600T case
6 GB RAM
1 64 GB SSD
1 1TB HDD
1 CD/RW
1 networking card

Thanks for your help guys.
7 answers Last reply Best Answer
More about extra power ocing take
  1. The GTX 460s are pretty low power. I believe that your current PSU is fine for 2 in SLI even overclocked.
  2. This site shows a similar system going from 447W to 502W after overclocking a pair of 460s.
    TechSpot: Nvidia GeForce GTX 460 SLI Performance Review, Power Consumption

    Looks like you're good.
  3. Best answer
    The Antec EarthWatts EA-650 is able to provide 45 Amps on its combined +12 Volt rails.

    A single GeForce GTX 460 SE @ 650 MHz has a Maximum Graphics Card Power draw of 160 Watts (i.e. 13.3 Amps from the +12 Volt rail)

    A single GeForce GTX 460 SE @ 851 MHz has a Maximum Graphics Card Power draw of 174 Watts (i.e. 14.5 Amps from the +12 Volt rail)

    Two GeForce GTX 460 SE @ 851 MHz in 2-way SLI mode will draw 29 Amps from the power supply's +12 Volt rails.

    That leaves 16 Amps on the +12 Volt rails to power the CPU, motherboard chipset, hard disk drives, CD/DVD/BR drives, etc. which is plenty.
  4. Best answer selected by spenceryuan.
  5. Thanks you guys are awesome. Looks like im ready to ride w two video cards:)
  6. How much extra usually does a mild CPU overclock draw? Maybe looking to get my i7-950 up to 3.8 Mhz
  7. spenceryuan said:
    How much extra usually does a mild CPU overclock draw? Maybe looking to get my i7-950 up to 3.8 Mhz

    When overclocked to 3.8 GHz, without raising the CPU's Vcore, under maximum CPU load it will consume approximately 55 Watts more.
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