Crossfire questions

[StonedPenguin]

I have a couple of questions regarding crossfire and my setup.

If I get another 6970 will they both run at 8x or will it be 1 16x & 1 8x?(or 4x?)



Can my PSU handle the upgrade? (I'm looking to upgrade CPU cooler & OC CPU to 4.8-5ghz too)

thanks.

 

[whipgeez]

depends on your motherboard

x8 and x8 is such a minimal difference compared to x16 and x16 anyway, about 1-3 fps max i think

 

[Surveyor]

If it's the motherboard in your sig. then it will be x8 and x8. You won't notice the difference between x8 and x16.

Your PSU (Corsair TX750) should just about run what you want and I believe it has four 6/8 pin PCI-E power connectors which is what you need.

The PSU would be running pretty much full pelt though when the CPU and GPU's are at high load.

 

[StonedPenguin]

Yes it is the motherboard in my sig, the TX750 does have 4x 6/8 pin pci-e connectors your right mate.

With an OC of 5GHZ, and 2 6970's will it be running full pelt?? If so is this a viable option for long term? I dont like the price of those 1KW psu's I'm trying to keep this machine majority 'Corsair' yes call me a fanboy idc. £190 for a 1kw Corsair PSU is a £190 more than i have

 

[StonedPenguin]

Bump.

 

[cmndr_andi]

I'm pretty sure that even with a 5GHz OC and two HD 6970s you will still be running within your PSUs range, even under full load. If you look here, a 6970CF setup draws at most 601W from the PSU - even with a slightly overclocked 130W i7 920 (@3.33GHz).

Looking at this review, at full load a 4.9GHz i5 2500k draws 73W more than at stock speeds - considering the 2500K is a 95W chip at stock then I reckon even under full load and at 5GHz (or as close as you can get) you will still be well within the limits of your seasonic-made corsair 750W PSU.

 

[Stormar]

i think you main problem will be cooling it all there is going to be some heat with 2x 6970 and a oc to 5ghz on air.

 

[StonedPenguin]

i think you main problem will be cooling it all there is going to be some heat with 2x 6970 and a oc to 5ghz on air.

I thought it might be an issue, This is why I brought 5 new Akasa AK-FN058 Apache Black Super 120mm fans for my case, There's a lot of air movement in there now, I dont want watercooling.

Do you know if that that power rating of 601W would include a SSD and a couple of SATA HDD's? or is that rated as a barebone pc?

thanks

 

[cmndr_andi]

The test system used there is pretty barebones, one SSD, three sticks of DDR3, a high end board (R2E) and an overclocked i7 920 @3.33GHz. However, since fans add a couple of watts each and a hard drives and DVD drives uses a maximum of ~7W then I really don't think these things will push you too close to the edge.

 

[StonedPenguin]

Thanks for that. I'll give it a go with the current PSU then, Will be getting the 2nd 6970 int he coming weeks so ill update on progress.