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6970+6990.. Different clock speed = better performance - Page 2

post #11 of 19
Thread Starter 
I hadnt touched the 6990, it is running fine as is, i was just looking for a bit extra voltage on the 6950 which i flashed.

That said, even with all the PCS up, clocked only through CCC etc, the results i am seeing with different clocks are still occurring. If i run all cards at 920, i get less fps than if i run the 6990 at 920 and the 6950 at a lower clock. I tested all the way from 830 up to 900 for the 6950, and the best fps was at 850 with 860 not far off. The 6950 will run at this clock on stock voltage no sweat so i have reflashed back to stock bios. Between BC2 and BF3 with multiple levels on each, i keep seeing that a different clock around 60-80hz results in 4-6fps better performance.

Ive spent so much time just playing with the computer, i think its about time i actually tried playing the MP! Thanks for your help Ken, i can now clock only through CCC, and with my LCD keeping track of GPU info, i dont need afterburner at all. Win.
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post #12 of 19
Quote:
Originally Posted by whippy View Post
I hadnt touched the 6990, it is running fine as is, i was just looking for a bit extra voltage on the 6950 which i flashed.

That said, even with all the PCS up, clocked only through CCC etc, the results i am seeing with different clocks are still occurring. If i run all cards at 920, i get less fps than if i run the 6990 at 920 and the 6950 at a lower clock. I tested all the way from 830 up to 900 for the 6950, and the best fps was at 850 with 860 not far off. The 6950 will run at this clock on stock voltage no sweat so i have reflashed back to stock bios. Between BC2 and BF3 with multiple levels on each, i keep seeing that a different clock around 60-80hz results in 4-6fps better performance.

Ive spent so much time just playing with the computer, i think its about time i actually tried playing the MP! Thanks for your help Ken, i can now clock only through CCC, and with my LCD keeping track of GPU info, i dont need afterburner at all. Win.
This will lead me to assume it's more related to the CPU though being clocked at 4 GHz. I don't think you should worry about it, you will see the scaling potential of these cards when you go with higher resolution such as 2560x1600 or multi screens. Otherwise, don't see the benefits of BF3/BF2 running at 200FPS at a 60Hz @1920x1200/1080.
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post #13 of 19
Thread Starter 
Ken, i am running 5760x1080. I did this testing with no CPU bottleneck, all cards ran at max and I double checked by dropping and increasing cpu clock multiplier to make sure it made no difference, it didnt.

I really have no explanation why having them clocked this way gives better results, but it does every time.
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post #14 of 19
Ah my bad. At that resolution 3-8 FPS makes a difference. This is just a wild guess, it could be the combinations of core/ memory clocks. You could try raising the memory clocks with the combinations of core clocks. For 6990, 1375-1450 is the sweet spot or go beyond 1500, in between often see the ECC kicks in.
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post #15 of 19
Thread Starter 
I found that increasing the memory clock gave noticeable gains, and am running all cards at 1450. But between the testing of core clock differences i had all memory clocks the same for all tests to ensure the gap in core clock was the only contributor to the increase.

Video ram has ECC? or is it a different ECC than what i am thinking of? (ie server memory error correction) I tried at 1550 on one occasion, but crashed straight away. Performance with memory at 1500 was nil/negligent, so stayed at 1450.

My mind keeps rolling to thoughts about the pcie lanes, and the fact that the 6950 is running on x16 in entirety while each gpu on the 6990 in effect has x8 bandwidth. Each gpu on that card has potentially 5%(?) less bandwidth available than the 6950 does. I dunno how that could be related to what im seeing, but its something i keep thinking about.
Edited by whippy - 10/28/11 at 8:27am
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post #16 of 19
Quote:
Originally Posted by whippy View Post
I found that increasing the memory clock gave noticeable gains, and am running all cards at 1450. But between the testing of core clock differences i had all memory clocks the same for all tests to ensure the gap in core clock was the only contributor to the increase.

Video ram has ECC? or is it a different ECC than what i am thinking of? (ie server memory error correction) I tried at 1550 on one occasion, but crashed straight away. Performance with memory at 1500 was nil/negligent, so stayed at 1450.

My mind keeps rolling to thoughts about the pcie lanes, and the fact that the 6950 is running on x16 in entirety while each gpu on the 6990 in effect has x8 bandwidth. Each gpu on that card has potentially 5%(?) less bandwidth available than the 6950 does. I dunno how that could be related to what im seeing, but its something i keep thinking about.
There's an error correction algorithm on the image renders, if you clock too far your card will not go faster because it is too busy re-rendering the bad frames. Your bandwidth lane wise is fine, but your cpu is on the low side.

**Also it's not about the lane width, it's about the delay in speed in rendering the frames in extreme lane width differences like for ex.. x16 and x4 crossfire. That is bad cuz the x16 card finishes so much faster then it has to wait to sync up with the x4 card. Your x16 6950 is barely hitting x8 so that is def not an issue anyways.
Edited by tsm106 - 10/28/11 at 8:49am
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post #17 of 19
Thread Starter 
Quote:
Originally Posted by tsm106 View Post
There's an error correction algorithm on the image renders, if you clock too far your card will not go faster because it is too busy re-rendering the bad frames. Your bandwidth lane wise is fine, but your cpu is on the low side.

**Also it's not about the lane width, it's about the delay in speed in rendering the frames in extreme lane width differences like for ex.. x16 and x4 crossfire. That is bad cuz the x16 card finishes so much faster then it has to wait to sync up with the x4 card. Your x16 6950 is barely hitting x8 so that is def not an issue anyways.
Interesting, thanks for that.

The 6950 clocks up to 930 stable, thats how i was using it before adding the 6990. While running the 6990 at 920, anything above 850 on the 6950 starts reducing the fps. If i match the clock rates between the cards, no matter what clock it is, it wont get as good a fps as if i have them at different rates. Strange!
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post #18 of 19
If you are still using Afterburner, it's not stange at all. Whatever PCS + % set in CCC Overdrive will be reset to Default + 0% by Afterburner everytime PC restarts.
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post #19 of 19
Thread Starter 
Missed this reply. No wasnt using afterburner, but i will double check tomorrow in CCC to make sure the PCS isnt at 0. cheers
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