Is my Power supply good enough for 6850 crossfire?

Current specs:
AMD Phenom II X4 965 at 4.ghz, 1.45v cooled with Corsair H60 watercooler push/pull
Asus M5A97 Motherboard
8Gb Wintec DDR3 1600 4x2gb
Kingston HyperX Memory Fans
MSI Cyclone Edition R6850 oc to 930 core 1200 mem
1 Rocketfish sound card
7 total case fans, 120mm blue LED
2 12'' cold cathode strips
500gb 7200 RPM WD HDD
3 80gb 7200 RPM HDD in Raid0
NZXT Sentry 2 fan controller
OCZ ModXTreme 600w Modular PSU

Question is, does my 600w powersupply have enough juice to add another MSI 6850? If I do crossfire it I most likely have both of my cards at stock speeds. It does say its crossfire/sli ready but considering all the extra stuff I Have drawing power, idk if I'll have enough.
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  1. Without looking at the amperage draw of the video cards and amperage delivery of the PSU, I can't say definitively, but generally speaking, 600 watt power supplies are right on the edge of being able to do x-fire/sli and have enough headroom left over.
  2. more then enough, I have most of what you have with a 400 watt psu
  3. I had a 560tiSLI build a little while back that would shut off while gaming. This only happened once I started overclocking the GPUs.

    I had a Cooler Master 700W PSU. I had no issues when I swapped it out for my current PSU, a 1200W Platimax. I was able to push both CPU and GPUs as hard as I thermally could.

    600W is gonna be a struggle if you ever want to overclock. It's probably fine for stock clocks though.
  4. A system running two HD 6850s in two-way crossfire requires a 600W PSU with at least 40A on the 12V rails and two 75W 6-pin PCIe power connectors. The HD 6850s are not power-hungry cards. Your PSU has sufficient PCIe power connectors and 42A on the 12V rails; it is sufficient for your desired CF upgrade. Your system is not likely to consume over 400W at full load in the CF config. A system with a highly OCd, power-hungry i7 965 consumed 393W at full load: http://www.guru3d.com/article/radeon-hd-6850-6870-crossfirex-review/4 You may have some room for OC, but I would approach it with caution and OC in small increments.
  5. Rugger said:
    A system running two HD 6850s in two-way crossfire requires a 600W PSU with at least 40A on the 12V rails and two 75W 6-pin PCIe power connectors. The HD 6850s are not power-hungry cards. Your PSU has sufficient PCIe power connectors and 42A on the 12V rails; it is sufficient for your desired CF upgrade. Your system is not likely to consume over 400W at full load in the CF config. A system with a highly OCd, power-hungry i7 965 consumed 393W at full load: http://www.guru3d.com/article/radeon-hd-6850-6870-crossfirex-review/4 You may have some room for OC, but I would approach it with caution and OC in small increments.

    +1
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