6990 x2 quadfire...what PSU?

[penske2298977]

As the title states, if I were to pair up two 6990's what PSU would be required?...each card apparently requires two 8-pin connectors?, did not think there were any power supplies that had 4 8-pin connectors.
Currently I have 5970 x2 and have a toughpower 1000W that has been pretty reliable on an OC'd x58 i7 build. I'm thinking I may need > 1000W for 6990 x 2 to be completely stable, or am I wrong?...thanks in advance for any input.

 

[Joseph F]

A Decent 1200W PSU would probably be safe... unless you're using something crazy like 2x 4.8Ghz Xeons, Then I'd say the 1500W Silverstone PSU on newegg would probably be good enough.

PS. Wait 'till they are released for actual power specs. I would assume they would consume 300W each so 1000W might do the job unless you have 2 CPUs and like a dozen disk drives.

 

[Soccerman06]

Based from

Id say at least 1200w ps if you plan on running the cards at the clocks they are meant to be clocked at and not stock. Otherwise, stock everything and you should be fine with a 1k... but the lower the % on the psu the better.

 

[tomoyo]

Wow 350w. That's outside pci-e spec. So looks like 700w + cpu + extras. I'd say stock speeds, 1000w would be fine, but if you oc with overvolting, 1200w would be much safer.

 

[chewietobbacca]

1200W would be safest though I bet a 1000W *should* be enough

Wow... finally putting those PSUs to use!

 

[Rifter]

if overclocking i would go for a 1500w since the 6990 can pull 450w+ when pushing it overclocking from what we have seen so far. If you are staying stock clock then a 1000w or 1200w would be fine.

 

[RaistlinZ]

If one by itself pulls 450w I don't think running two would pull 900w. Someone correct me if I'm wrong, but I don't think it works that way.

 

[HumblePie]

That 450w is at max OC and 100% load on the card. Otherwise it won't get that high.

But because anyone who builds a system like this is going to run synthetic benchmarks a few times which will push the cards, you need to plan for the right PSU.

So 450w x2 would be 900w. Add in the rest of a decent OC'd system of around 200-250W and you are good at 1200W PSU when pushing your system to the extreme. Some people like extra head room and rather be at the 70%-80% capacity of their PSU instead of 85%+ as some PSU's start losing efficiency that high. If you fit in this category a 1500w supply will do it.

 

[FiLeZz]

As the title states, if I were to pair up two 6990's what PSU would be required?...each card apparently requires two 8-pin connectors?, did not think there were any power supplies that had 4 8-pin connectors.
Currently I have 5970 x2 and have a toughpower 1000W that has been pretty reliable on an OC'd x58 i7 build. I'm thinking I may need > 1000W for 6990 x 2 to be completely stable, or am I wrong?...thanks in advance for any input.

AX1200 corsair will do the job and all the PCIE powercords are 6+2 pin so they are all 8 pin.


I had 2x5970's now on 3x6950's flashed to 6970's waiting on 6990's

 

[Castiel]

Ax1200

 

[tomoyo]

I actually prefer the HCP-1200 over the AX-1200, but both have more than enough cables to work.

 

[f4phantom2500]

AX1200 corsair will do the job and all the PCIE powercords are 6+2 pin so they are all 8 pin.


I had 2x5970's now on 3x6950's flashed to 6970's waiting on 6990's

jesus dude i'd still be more than 100% satisfied with a single 5970...or 6950...

 

[tomoyo]

I assume the only reason for quadfire, is someone running at least 3 lcds. Otherwise I don't see the point of wasting so much money and power.
Also with the official reviews, it's clear that you'd want at least 650-750w for a single card and 1200w for dual.

 

[dav9]

Wow 350w. That's outside pci-e spec. So looks like 700w + cpu + extras. I'd say stock speeds, 1000w would be fine, but if you oc with overvolting, 1200w would be much safer.

So can i drop a 6990 into my motherboard which has pci-e (would i need additional things?) or do you mean it would have to draw its power from a separate 6 or 8 pin connector iirc?

 

[tomoyo]

You need 2 8 pin connectors from psu period. No ways around that.

 

[nwo]

Also with the official reviews, it's clear that you'd want at least 650-750w for a single card and 1200w for dual.

650W if you are not overclocking the card, 750W if you are overclocking the card and CPU.