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Another SLI CPU bottleneck question

post #1 of 35
Thread Starter 
I have this setup:

AMD Phenom II x4 965 3.4 GHZ
8GB ddr3 1600mhz 2x4gb
Asus gtx 460 1gb
1080p

IF I add another Asus GTX 460 1gb, will the CPU bottleneck? I read many places it will, but if I oc cpu to 3.8-4.0, will I get at least 90%usage for each GPU in games like BF3, GTA IV, skyrim and new games, with the latest drivers??


IF the 965 is not enough, will the upgrade to 1050t or 1100t, again OCed, stop bottleneck??

I have an AMD board:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128514

I do not wish to upgrade to intel, ever!! maybe long long time later, but now its AMD biggrin.gif

Thanks
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post #2 of 35
Finally a AMD fan! And I would say another one would do fine!
post #3 of 35
The bottleneck in question will be more relevant on CPU-bound games than anything else. Games like BF3 are GPU dependent, no matter what others might try to tell you.

Going SLI 460's with the 965 should prove quite an improvement. Will there be a bottleneck? Sure. Can you mitigate the bottleneck by overclocking to 3.8 or higher? Yes. Will it be enough? Depends on the game.

The best thing you can do for gaming performance on an existing platform, is to upgrade the GPU end of your system. If that means adding another card for SLI, that's what you should do!

Upgrading to an X6 won't do much other than give you more processing power for heavily multithreaded programs. It might help alleviate the bottleneck in games that are both CPU and GPU intensive, such as SC2, but even then it makes no sense to upgrade in that fashion because you're adding cores the equation when you need higher clocks, not more cores. In fact games like SC2 won't benefit from more than two cores anyways, except maybe a triple core to help offload some of the OS to another core.

So take your 965 as high as you can get it - either on air or water - and add that 460 to your system. You'll enjoy the added benefit of being able to run more AA in some games and increased gaming performance overall.
Edited by GanjaSMK - 1/23/12 at 5:29pm
    
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post #4 of 35
this is my system results for gta 4 at max settings, 58fps,cpu usage 76%,system memory 43%,video memory 99%. gta4 isnt that good of a benchmark but thats all i got right now. when i play dirt 3 on high settings i get 100% all 4 cores and 97% video. i dont think your gonna have any issues every game is different.
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post #5 of 35
My only concern is good luck finding another Asus GTX 460, they are out of stock everywhere.
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post #6 of 35
It wouldnt really be a bottleneck but that depends on how you define "bottleneck". A lot of guys consider anything that gives you 1 frame less is a bottleneck. I consider something that takes a huge chunk of performance out to be a true bottleneck. Going from 65 to 60 fps is not a bottleneck but 65 to 35 would be.

It will also depend on your resolution. If youre at 5040x1050 then pretty much anything will be a bottleneck but for 1920x1080 you wont need a $1000 processor to handle it.

So all that being said, no, a X4 with a solid overclock will not hold back a pair of GTX460's. Upgrading to a X6 with a healthy overclock wouldnt be a bad idea either as its always good to have the most CPU muscle you can but you dont have to.
post #7 of 35
Thread Starter 
thumb.gif
Thanks everybody, I guess I will try to find another Asus Gtx 460 and SLI, later on.

Is it possible to SLI evga and asus, even though they both have different clocks?
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Blue Dream
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Noctua 6 Dual Heatpipe with 140mm/120mm Dual SSO Bearing Fans CPU Cooler NH-D14 - Retail
CPUMotherboardGraphicsGraphics
AMD Phenom II x4 965 3.7 ~ 1.376v GIGABYTE 990fxa-UD3 Asus GTX 460 1GB 256-bit SLI Msi GTX 460 1Gb 256-bit SLI 
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post #8 of 35
Quote:
Originally Posted by Aregvan View Post

thumb.gif
Thanks everybody, I guess I will try to find another Asus Gtx 460 and SLI, later on.
Is it possible to SLI evga and asus, even though they both have different clocks?

As long as it's another 460, that's all that should matter.
post #9 of 35
Sure bud, You can SLi any two nVidia cards of the same model regardless of the brands. Just make sure its another GTX460 with the same memory and cudacore count, like GTX460 1GB 336SP with another 1GB 336SP version. And If you use MSI afterburner then it lets you auto sync the top cards clocks with the bottom one. GTX460 in SLi is still an awesome setup, thumb.gif

However I think the setup might pose a slight bottleneck on a Phenom II. Are you able to overclock it a bit further or maybe grab a better processor? redface.gif
post #10 of 35
Quote:
Originally Posted by Aregvan View Post

thumb.gif
Thanks everybody, I guess I will try to find another Asus Gtx 460 and SLI, later on.
Is it possible to SLI evga and asus, even though they both have different clocks?

Yes. You can SLI any 460 from one manufacturer to another. So long as each card is inherently a 460, you're good to go. However, I cannot remember if the 786MB version (slightly less powerful than a true 460 with 1GB) can SLI with a 1GB version.

Just grab any cheap 1GB 460 you can (similar clocks or not) and SLI. You can always increase the clock speed of the lower clocked card to match the higher clock speeds of the other (most likely). And if you don't increase the clock speed of the lower clocked card, the higher clocked card will default (if I remember correctly) to the lower clocked speeds of the other.

( edit )
Quote:
You cant SLi one with lower cuda core or vram count. So it must be another 1GB model.
^- There you go! I thought that was the case but my brain, it just oozes failed memory sometimes. tongue.gif
Edited by GanjaSMK - 1/23/12 at 6:08pm
    
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