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Sli on a i5

post #1 of 24
Thread Starter 
Okay before i dig myself another hole that cost money to get out of, i better ask some questions.


For Christmas, i got a GTX580, at the time i was running a C2D E7500. Everyone basicly said that the CPU was a bottle neck.

So i went out and ordered a i5-760, ASUS P7P55D-E Pro, and 4gb DDR3 2000MHZ ram.


If i was to get another GTX 580, will i be bottlenecked again by the i5?


I kinda realize now, i should have just got an i7, or even SB setup, but money was kinda tight, and hindsight is always 20/20
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post #2 of 24
The only difference between i7 and your i5 is the HT which shouldn't have any effect on GPU performance. What is your CPU at right now?
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post #3 of 24
Overclock the 760 to 3.6 - 4ghz. Without it you will be bottlenecked. Your memory is fast enough to make this overclock a cakewalk.

Being a P55 motherboard, you may get a 3-5% performance loss due to 8x/8x.
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post #4 of 24
Quote:
Originally Posted by whybother View Post
Overclock the 760 to 3.6 - 4ghz. Without it you will be bottlenecked. Your memory is fast enough to make this overclock a cakewalk.

Being a P55 motherboard, you may get a 3-5% performance loss due to 8x/8x.
umm...no you really wont notice too much of a difference between 8x/8x or 16x/16x

where the hell you got any idea his cpu will bottleneck a gtx580 is beyond me....ive run crossfire and sli on my mobo with an i5 750, at stock and on its current overclock, with minimal performance losses, when i say minimal i mean like 4 fps in crysis....

im not flaming...just making an educated point
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post #5 of 24
Thread Starter 
Quote:
Originally Posted by TickleMeElmo View Post
The only difference between i7 and your i5 is the HT which shouldn't have any effect on GPU performance. What is your CPU at right now?
Im waiting for it in the mail.

But i will try to hit 4.0Ghz with the H50 for cooling.
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post #6 of 24
Quote:
Originally Posted by PCSarge View Post
umm...no you really wont notice too much of a difference between 8x/8x or 16x/16x

where the hell you got any idea his cpu will bottleneck a gtx580 is beyond me....ive run crossfire and sli on my mobo with an i5 750, at stock and on its current overclock, with minimal performance losses, when i say minimal i mean like 4 fps in crysis....

im not flaming...just making an educated point
First off, yes, you will not notice the 8/8 vs 16/16 while gaming.

And yes, his CPU will bottle neck a SLI setup of two 580.
Even it it means he is going to lose only 7-8 fps when he already gets a huge FPS count on a 1080p TV, it still means its bottlenecks

Only thing to think about is that SLI of 580s will be such a raw power house, that losing 10-15% from 8/8 and CPU on low OC, won't matter in real gaming on a 1080p TV, but only in benchmarking, which I have a feeling won't matter to the OP very much.
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post #7 of 24
Quote:
Originally Posted by PCSarge View Post
where the hell you got any idea his cpu will bottleneck a gtx580 is beyond me....ive run crossfire and sli on my mobo with an i5 750, at stock and on its current overclock, with minimal performance losses, when i say minimal i mean like 4 fps in crysis....

im not flaming...just making an educated point
This is really a blanket statement that is really missing the point on the CPU bottleneck. People go on an on about whether or not this CPU will bottleneck that GPU, but the truth is that Bottleneck, or not, is entirely based on the application.

The point is in some games the CPU will not be fast enough to deliver the appropriate amount of information to the GPUs for rendering. And just because 2x580s is overkill he may not notice the bottleneck, but that doesn't mean its not there...

To test this all you have to do is enable the SLI indicator bar in the nVidia menu and see if they are fully extended during intense gameplay.
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post #8 of 24
The x8/x8 should have no noticeable effect. Maybe 1-2 fps max.
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post #9 of 24
Quote:
Originally Posted by tconroy135 View Post
This is really a blanket statement that is really missing the point on the CPU bottleneck. People go on an on about whether or not this CPU will bottleneck that GPU, but the truth is that Bottleneck, or not, is entirely based on the application.

The point is in some games the CPU will not be fast enough to deliver the appropriate amount of information to the GPUs for rendering. And just because 2x580s is overkill he may not notice the bottleneck, but that doesn't mean its not there...

To test this all you have to do is enable the SLI indicator bar in the nVidia menu and see if they are fully extended during intense gameplay.
+1, sir.

Quote:
Originally Posted by TickleMeElmo View Post
The only difference between i7 and your i5 is the HT which shouldn't have any effect on GPU performance. What is your CPU at right now?
Exactly. IIRC there is very little difference between an i5 and i7 in terms of gaming. And considering the i7 is one of the fastest consumer CPU's available, there really isn't much choice in terms of upgrading from your i5 for gaming purposes.

I think you'll be fine. You have a very fast CPU which may or may not have a slight "bottleneck" with your extremely high-end GPU(s). Bottleneck or not, I would bet that adding another GTX580 would still increase your frame rates. (Only in very high end games, that is. I mean, in the majority of games, a single GTX580 will be enough to max out the graphics with some room to spare anyway).

I think people worry too much about bottlenecks sometimes. As long as your hardware reasonably matches in overall performance I wouldn't let it bother you too much. My 2 cents.
    
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post #10 of 24
Good advice on this thread. i5-760's run great
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