FX-8320 + GTX 770 in 2-way SLI: How many watts?

I searched in the dang nvidia website and didn't find anything. How many watts do I need?

Please don't say 1000w or something like that. Will 650w be enough? Or should I ramp it up to 750w? I want to OC.

Thanks!
7 answers Last reply
More about 8320 gtx 770 sli watts
  1. You'll be safe with 850W PSU

    PCPartPicker part list / Price breakdown by merchant / Benchmarks

    Power Supply: Corsair Enthusiast 850W 80+ Bronze Certified Semi-Modular ATX Power Supply ($120.98 @ Newegg)
    Total: $120.98
    (Prices include shipping, taxes, and discounts when available.)
    (Generated by PCPartPicker 2014-03-30 08:53 EDT-0400)
  2. But that is very expensive. And won't just 750 be more than enough?
  3. A 650 won't do it. Approx ~230 watts a piece for the GPU's, plus the CPU. Then all the little things added up(fans, drives, ect...). And you need to be several hundred watts above that. You can't put a 650 watt load on a 650 watt PSU. An 850... that is acceptable, if it's a good unit.

    On another subject. The FX 8320 will bottleneck. As the old FX clips are not good for SLI or crossfire. Tom's tested a 8350 with Radeon 7970's back in the day(vs. an i7-3770K).
    http://www.tomshardware.com/reviews/fx-8350-core-i7-3770k-gaming-bottleneck,3407-5.html
  4. Enderegg said:
    But that is very expensive. And won't just 750 be more than enough?


    You want OC your CPU, and for OC you need some headroom i wouldn't cheap out on PSU because once it fail you'll lose all your hardware!
  5. wdmfiber said:
    A 650 won't do it. Approx ~230 watts a piece for the GPU's, plus the CPU. Then all the little things added up(fans, drives, ect...). Then you need to be several hundred watts above that. You can't put a 650 watt load on a 650 watt PSU. An 850... that is acceptable, if it's a good unit.

    On another subject. The FX 8320 will bottleneck. As the old FX clips are not good for SLI or crossfire. Tom's tested a 8350 with Radeon 7970's back in the day(vs. an i7-3770K).
    http://www.tomshardware.com/reviews/fx-8350-core-i7-3770k-gaming-bottleneck,3407-5.html


    It won't bottleneck. Not going to die to lose 5 fps over 120. OC everything and it's good to go. 750 Should be enough. Thanks
  6. I know it's old thread but I'm currently running fx 8320 clocked at 4.4 ghz and 2 gtx 770 reference cards (Titan cooler) and I have it all on corsair cx750m and runs fine. Peak watts on heavy load (prime95 and furmark at the same time) it's 745 watts. And running prime and furmark at the same time it's unreal load which you will never see in real world if you just gaming or whatever you do. So I would say 750 it's enough.
  7. Nvidia calls for a 850 watt PSU for 770's in SLI. Prob be ok with a 750, but a 650 should be too weak. I wouldn't even try it with an Intel CPU(77 watts). However, he said he's was going with a 750, so it depends on how inefficient his CPU is.
    This site(as mentioned by others on Toms) keeps an excellent up to date recommended chart:
    http://www.realhardtechx.com/index_archivos/Page362.htm
    10th column down on the right...

    The 8320 and 8350 are both rated the same, 125 watts. But overclocking by several hundred MHz can put the power consumption "through the roof".
Ask a new question

Read More

Gtx SLI Systems Nvidia