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Overclocking in crossfire - Page 2

post #11 of 20
i think what OP is getting at is the debate = hypothetically OC gpu(+15% performance) + OC GPU(+15% performance) does or does not equal +30% performance in sli/cfx (correct me if im not understand your question). But as we all know, sli/cfx does not double your performance, so in a sense your brother is right. if you take the above example, you wouldnt get 30%, maybe 20% additional from OC.
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post #12 of 20
Dirt 3 Benchmark Catalyst 11.6 App Profiles 11.6 CAP 3
1920x1080
Ultra Settings
8xMSAA

Single 5850 Stock Clocks
Core 765mhz
Mem 1000mhz
Avg FPS: 46.95



Single 5850 Overclocked
Core 840mhz
Mem 1000mhz
Avg FPS: 50.43


CrossfireX 5850's Stock Clocks
Core 765mhz
Mem 1000mhz
Avg FPS: 88.45


CrossfireX 5850's Overclocked
Core 840mhz
Mem 1000mhz
Avg FPS: 94.29


Seems your brother has been proved wrong The difference between the single card stock and single card oc is about 3fps whilst in the crossfire overclocking yielded an extra 6fps.
Edited by fashric - 7/22/11 at 4:22pm
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post #13 of 20
I like the question raised here. I've been wondering myself, in fact, as running quad-crossfire provides so much potential horsepower @ stock clocks..if it makes sense to further push the system considering potential heat & strain on components for what may be utterly negligible benefit. I'ma run a few tests myself here (dunno why I haven't ever before?) to see just how many "fps" are boosted in high clock relative to stock & underclocked values.
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post #14 of 20
Thread Starter 
Quote:
Originally Posted by fashric View Post
Dirt 3 Benchmark Catalyst 11.6 App Profiles 11.6 CAP 3
1920x1080
Ultra Settings
8xMSAA

Single 5850 Stock Clocks
Core 765mhz
Mem 1000mhz
Avg FPS: 46.95

Single 5850 Overclocked
Core 840mhz
Mem 1000mhz
Avg FPS: 50.43

CrossfireX 5850's Stock Clocks
Core 765mhz
Mem 1000mhz
Avg FPS: 88.45

CrossfireX 5850's Overclocked
Core 840mhz
Mem 1000mhz
Avg FPS: 94.29

Seems your brother has been proved wrong The difference between the single card stock and single card oc is about 3fps whilst in the crossfire overclocking yielded an extra 6fps.
I'm sorry to bother you even more but can you take screens of your benchmark/s? I want definitive proof that I can show him.
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post #15 of 20
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post #16 of 20
Thread Starter 
Quote:
Originally Posted by fashric View Post
Pics added
Thanks man, I use to have a 5850 myself, they were awesome cards. Hopefully he'd be satisfied with these benches. :]

Edit: Just talked with my bro, he's partially convinced but not completely, he doesn't believe the cards are OC'd enough to provide definitive data. Plus the memory is also untouched on those 5850's so that could effect part of the equation.
Edited by Tyrant1337 - 7/22/11 at 4:58pm
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post #17 of 20
Well let him think what he wants its been proven that he's wrong right here. Overclocking higher isn't going to change anything and overclocking the memory yields very little extra performance so isn't really worth it and I would love for him to explain how he thinks it will have a negative impact on the performance which it would need to do if he was to be proven correct. To put it politely he's clutching at straws.
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post #18 of 20
Heaven Benchmark Catalyst 11.6 App Profiles 11.6 CAP 3

Single 5770 Stock
Core 850
Memory 1200
FPS 19.8

Single 5770 OC
Core 920
Memory 1250
FPS 21

Crossfire 5770 Stock
Core 850
Memory 1200
FPS 37.5

Crossfire 5770 OC
Core 920
Memory 1250
FPS 39.6

I will up the OC to see if it scales better.
post #19 of 20
Quote:
Originally Posted by XXXfire View Post
I like the question raised here. I've been wondering myself, in fact, as running quad-crossfire provides so much potential horsepower @ stock clocks..if it makes sense to further push the system considering potential heat & strain on components for what may be utterly negligible benefit. I'ma run a few tests myself here (dunno why I haven't ever before?) to see just how many "fps" are boosted in high clock relative to stock & underclocked values.
so ur fps went from 1000 to 1200 ? damn u and ur dual 6990's! lol
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post #20 of 20
Quote:
Originally Posted by tictoc View Post
Heaven Benchmark Catalyst 11.6 App Profiles 11.6 CAP 3

Single 5770 Stock
Core 850
Memory 1200
FPS 19.8

Single 5770 OC
Core 920
Memory 1250
FPS 21

Crossfire 5770 Stock
Core 850
Memory 1200
FPS 37.5

Crossfire 5770 OC
Core 920
Memory 1250
FPS 39.6

I will up the OC to see if it scales better.
Hi,

With your 5770's, How much eye candy settings were applied in
the tests.

Later
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