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post #11 of 27
Thread Starter 
Quote:
Originally Posted by Quesoblanco View Post

It depends on the game. I would overclock it as much as possible.


well i can get high as 4.4ghz would that be enough ?
post #12 of 27
Like I said it depends on the game. You cant go higher? You have a good motherboard and cooler
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post #13 of 27
Thread Starter 
Yea i can get up 2 4.7ghz at 1.46v
post #14 of 27
Nothing wrong with 1.46v. Go as high as u can keeping it under 1.55v. The higher the overclock the better. Just make sure temps are within reason.
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post #15 of 27
Thread Starter 
Ok cool 4.7 is the highest i got sny and my vrms overheat and so 4.7ghz good for 2 hd 7870
post #16 of 27
Yeah it will be a nice set up. Try setting up a fan on the VRMs to keep them cool.

http://www.guru3d.com/articles_pages/radeon_hd_7870_overclock_guide,3.html 2 overclocked 7870s pull about 300 watts from the wall. So you will be good with that power supply.
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post #17 of 27
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Ok cool so my psu be ok using 610w at full load ?
post #18 of 27
You won't pull that much power.
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post #19 of 27
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Quote:
Originally Posted by Quesoblanco View Post

You won't pull that much power.

how power will i pull then
post #20 of 27
Quote:
Originally Posted by skitz9417 View Post

Ok cool so my psu be ok using 610w at full load ?

Based on my experiences with dual 7850s, nope! Try Litecoin mining full blast plus BOINC on the 4.6GHz CPU and a couple monitors. The UPS reported it was pulling ~550W at its peak from the wall. Disregarding the monitors and accounting for an 80+ Bronze PSU, that becomes ~450-475W used by the system. You're fine.

Bottlenecks? Depends. If the game is GPU limited, you'd probably be fine running dual 290Xs. However, if the game is heavily CPU-bound, then you'll need to overclock to 10GHz, and even then the GPUs might not be fully utilized. Obviously those are exaggerations, but there is no black-and-white line that separates "bottlenecks" and "no bottlenecks." Overall, there shouldn't be any.

Two 7870s should, in a perfect world, perform slightly worse than a single R9 290. Both setups have 2560 shaders, 160 TMUs, and 64 ROPs. The 290 is GCN 1.1, and as such is somewhat more powerful. The 290 is also a single card, and since scaling is never 100% efficient, is somewhat more powerful. Just be aware that VRAM is not additive in crossfire - if you have a 1GB 7750 and a 4GB 7750 (they do exist, and no, I don't get it either) in crossfire, only 1GB is usable. I'm not entirely sure if bus width and therefore bandwidth is additive. I think no, but I'm not 100% sure.
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