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Will a 1090T @ 4Ghz bottleneck Crossfired unlocked 6950s? - Page 3

post #21 of 32
Quote:
Originally Posted by pioneerisloud View Post

BF3, not to a huge degree. But it would still be there. I have no clue about the percentage though. BF3, last time I checked at least, didn't properly support crossfire / SLI anyway, they were having massive issues with it. I could be wrong though.

I havn't had any issues since day 1. =P

OP: In BF3 I doubt you'd see a bottleneck, I get ~80% out of my 3 with my sig rig.
post #22 of 32
Quote:
Originally Posted by OwnedINC View Post

I havn't had any issues since day 1. =P
OP: In BF3 I doubt you'd see a bottleneck, I get ~80% out of my 3 with my sig rig.

yes. you won't see a bottleneck at all with BF3. if gpu load is low it's a driver issue. the game is well threaded you don't have to worry about bottlenecks if you have a multicore cpu
post #23 of 32
Quote:
Originally Posted by pioneerisloud View Post

The easiest way to tell if you're being CPU bottlenecked....
Overclocks on your CPU and GPU.
If you go from stock to overclocked on your CPU, and you see a huge difference, that's a CPU bottleneck (at least at the lower speeds). If you see very little or no difference (like my i5 in most games), then its not a bottleneck. The ONLY game that I noticed a difference with my i5, is GTA IV. Any other game, I can max out with 60+ FPS minimums at stock (I don't have some of the newer games, so no comment there). So for the games that I PLAY, I'm not bottlenecked, even at stock (except GTA IV).
If you go from stock to a good healthy overclock on your GPU, and you see improvements, that's NOT a bottleneck. If you see little or NO DIFFERENCE with a GPU overclock, that's a bottleneck. Example, I notice pretty big differences with my old 470 and my 580 by going even 75-100Mhz more on them with my i5. With my AMD setup, I saw literally no increase when overclocking my 470 on it.

Oh ok, so say in a benchmark that only uses 2 cores, it would be possible to overclock the gpu and not see a gain and many people might think its a gpu issue rather than a potential cpu bottleneck lol I never thought of that....interesting and something I should keep in mind.

I didnt realise this before but anyone considering to go sli or CF on a $300-400 gpu with an amd should just consider an intel swap instead for nearly the same price, im personally waiting for ivy, almost went SB once I saw how bad the fx-8150 went but decided my cpu is good enough for now and will wait for ivy.
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post #24 of 32
Quote:
Originally Posted by 66racer View Post

Guys (jprovado and pioneerisloud) I found what you guys wrote about due to real world experience to be very informative, thanks!
So how do you properly test to see if there are bottlenecks, for instance with my system, lower it to say 3.8ghz then back to 4244mhz, if a rise in fps occures obviously a bottleneck and possibly even more gains with higher overclock, but if no rise occurs then no bottleneck in the game tested with? Imjust a knowledge nut lol
for anyone interested although not multi gpu here is what an 1100T at 4244mhx 3055mhz cpu-nb looks like in bf3, 1920x1080, ultra msaa off, 64player match
338

no cpu bottlenecks. your gpu load is always high and most of the time at max load. considering it's a new game. if you have low gpu load on some areas it's not a cpu problem but driver related problems instead
post #25 of 32
Quote:
Originally Posted by 66racer View Post

Oh ok, so say in a benchmark that only uses 2 cores, it would be possible to overclock the gpu and not see a gain and many people might think its a gpu issue rather than a potential cpu bottleneck lol I never thought of that....interesting and something I should keep in mind.
I didnt realise this before but anyone considering to go sli or CF on a $300-400 gpu with an amd should just consider an intel swap instead for nearly the same price, im personally waiting for ivy, almost went SB once I saw how bad the fx-8150 went but decided my cpu is good enough for now and will wait for ivy.

I'm gonna look into my benchmark screenshots. I'm gonna give youj a classic example of overall cpu score vs. low gpu score due to cpu bottlenecks (benchamrk can only use 2 threads) gimme a minute. hopefully I can find a couple of 3dmark06 benchmarks I did years ago
post #26 of 32
phenom II 955 @ 3.8ghz+ 5970
404

phenom II 1090T @4.1ghz + 5970
402

notice the cpu score had a huge increase but gpu scores did not? because the gpu benchmarks only used 2 threads. the increase in gpu scores was only becasue of the additional 300mhz overclock. if you had a similar intel system with the same cpu score of 7000+, you will have a much higher graphics score on the intel cpu because with intel cpu's have less cores. they have more performance per core. a 1090T can only use 33% of the cpu's capability (2 out of 6 cores) while the intel cpu can use 50% or 2 out of 4 cores.

an intel cpu will normally have a much higher score than that. usually on the 30k range with a similar overclock
Edited by jprovido - 11/23/11 at 5:55pm
post #27 of 32
Quote:
Originally Posted by jprovido View Post

phenom II 955 @ 3.8ghz+ 5970
404
phenom II 1090T @4.1ghz + 5970
402
notice the cpu score had a huge increase but gpu scores did not? because the gpu benchmarks only used 2 threads. the increase in gpu scores was only becasue of the additional 300mhz overclock. if you had a similar intel system with the same cpu score of 7000+, you will have a much higher graphics score on the intel cpu because with intel cpu's have less cores. they have more performance per core. a 1090T can only use 33% of the cpu's capability (2 out of 6 cores) while the intel cpu can use 50% or 2 out of 4 cores.
an intel cpu will normally have a much higher score than that. usually on the 30k range with a similar overclock

a 7.5% increase in sm3 is still pretty good not gunna lie =P
post #28 of 32
Quote:
Originally Posted by jprovido View Post

no cpu bottlenecks. your gpu load is always high and most of the time at max load. considering it's a new game. if you have low gpu load on some areas it's not a cpu problem but driver related problems instead

Cool, someone was telling me I was bottlenecked on the cpu side, I didnt know how he could say that when the gpu was max and cpu cores werent. There was some good info in here though about different ways a bottleneck can occure. Once I do go intel i will enjoy comparing numbers like you guys did
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post #29 of 32
Quote:
Originally Posted by OwnedINC View Post

a 7.5% increase in sm3 is still pretty good not gunna lie =P

3.8ghz to 4.1ghz did make a difference. the point I was trying to make was with a cpu score of 5000points to 7000points. you should be expecting a BIG improvement in overall score esp if you know know that you're cpu bottlenecking (btw I'm using a accelero xtreme on my 5970 back in the day. it was a monster overclocker tongue.gif afaik it was clocked at 950mhz core but did not have any impact in performance compared to stock with benchmarks like this). turns out the performance of a phenom II x6 1090T @ 4.1ghz is no different from a phenom II x2 @ 4.1ghz in games that can only utilize 2 threads
post #30 of 32
Quote:
Originally Posted by jprovido View Post

3.8ghz to 4.1ghz did make a difference. the point I was trying to make was with a cpu score of 5000points to 7000points. you should be expecting a BIG improvement in overall score esp if you know know that you're cpu bottlenecking (btw I'm using a accelero xtreme on my 5970 back in the day. it was a monster overclocker tongue.gif afaik it was clocked at 950mhz core but did not have any impact in performance compared to stock with benchmarks like this). turns out the performance of a phenom II x6 1090T @ 4.1ghz is no different from a phenom II x2 @ 4.1ghz in games that can only utilize 2 threads

I even learned something today from all this =P

I always thought the GPU's would use all of a CPU regardless of how threaded the game was.
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