Will this be strong enough?

[ChappedStick]

http://www.newegg.com/Product/Produc...82E16817139015

Is this fine for 6970CF or should I go for something bigger?

 

[VirtualLarry]

I think that should be good. If you're worried, you can adjust the Power-control thing in AMD Overdrive. You get +/- 20% control over the power usage of your card(s).

What kind of CPU are you planning on running with it? Plan any overclocking? If you plan on heavily overclocking both the GPUs and the CPU, then you might want to go larger on the PSU. But at stock, you'de be fine with that PSU, I expect.

 

[ChappedStick]

I plan to use these with a i7 2600k as long as the motherboard prices are reasonable. If I do any overclocking it wont be anything extreme.

 

[TemjinGold]

It'll be enough and then some.

 

[BoomerD]

Hell yes. I'm building a new system with an i5-760, ASUS P7P55D-E Pro board, 4 sticks of DDR3, and the EVGA Superclocked GTX460...and using my Corsair HX620 PSU...and will have power to spare.
That 850 will do everything you ask and more.

 

[SirGCal]

I know they recommend a 550 for a single 6970... 850 enough for crossfire? Perhaps. It would depend on the rest of your system. But I do not know the specs of the processor you listed so... And it just depends how much safety margin you're looking for.

 

[tomoyo]

What's recommended is idiotic. A 450 would be plenty for most systems on a 6970. Also 700 should be more than enough for crossfire.

 

[TemjinGold]

I know they recommend a 550 for a single 6970... 850 enough for crossfire? Perhaps. It would depend on the rest of your system. But I do not know the specs of the processor you listed so... And it just depends how much safety margin you're looking for.

No it would not. There is no way his system can draw anywhere near 850 watts. Period.

 

[SirGCal]

No it would not. There is no way his system can draw anywhere near 850 watts. Period.

You can't really say that there is no way... With a crossfire setup sucking up to a possible 601W, if he's running a bunch of hungry HDDs and/or a RAID setup and a 140W CPU with a lot of memory, he could easily hit it... Just saying it's possible...

Plus, you really want to keep it under the rated power for longevity (though he obvious still wouldn't be maxing it out all the time even if... most likely...). I like to keep it under 75-80% of the rated power which would mean a target of ~ 635-680W max load with that unit. So with a max pull of 601W possible from the video cards (according to Anandtech's own review), that would leave 34-79W for the rest of the system. But I'm conservative and like my systems to last.

GAH - see next post...

 

[SirGCal]

Gah... What I get for doing this half a sleep. Anandtech does total system power, not just video power in their reviews. So my math is off some. Still it would be possible to over-draw it if he had sufficient 'other stuff' in his rig... It is possible but... After realizing my mis-read, I have to agree, you'll probably be fine unless your system is like mine and overflowing with HDDs.

 

[TemjinGold]

Let me spell it out for you: I have a hardware unit measuring how much juice the system in my sig draws from the wall. At gaming load, it maxes at 220 watts. Figure in 80% efficiency on the part of the psu and it means the system is only drawing 176 watts from the psu. His 6970 doesn't draw much more than my 5850. Yes he has two of them but an 850 watt unit can supply enough power for almost FIVE of my system.

Hard drives are like 20 watts each. If you honestly still think there is any way his system can draw even close to 850 watts, I have nothing else to say. Few people these days legitimately need more than a quality 700 watt unit. Most simply greatly overestimate what they need because manufacturers have ramped up PSUs to insane numbers.

 

[rgallant]

http://www.newegg.com/Product/Produc...82E16817139015

Is this fine for 6970CF or should I go for something bigger?

-well for myself I might look at 6970 cf and wondering if my tx850 would be enough.
-580sli=1200w for me
-I wouldn't go smaller myself. I like 50-60% load - big bangs are bad for the heart.
-some people throw #'s around but 600w dc @ 12v is a lot of killingpower -re car batt. - -needs good equipment. re 600 watt a\c light bulbs @120v
-some people with high end gaming rigs have stated 1000w.
-buying new today I would get a 950w-1200 and be done with it.
- in this section 3- 4 years ago one of the big guys at that time ranted and raved at me that no one at any time will every use more than his loving little tx520 could handle.-I guess he's still playing ping pong.

 

[rgallant]

I know they recommend a 550 for a single 6970... 850 enough for crossfire? Perhaps. It would depend on the rest of your system. But I do not know the specs of the processor you listed so... And it just depends how much safety margin you're looking for.

+1 on the safety margin. fire & smoke doesn't match my decor.
-some people don't under stand what there playing with.
-playing stalker cop[8 hrs] on a hot day 60c +[air- not parts] on the temp sensor behind the psu.