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Own an 8800? You might want to look at this.

post #1 of 21
Thread Starter 
Originally posted here.
http://www.ocforums.com/showthread.php?p=5070814

While I was overclocking my video cards I noticed that even when I clock my card to 656 RivaTuner shows it at 648. I thought this must be a mistake. Nope, I was wrong. ATItool may say 656 but in reality its only 648.
The gpu clocks moves in 27mhz intervals.
The shader clock goes in 54mhz intervals based on the gpu clock
The mem clock goes in 18mhz intervals.

These are the only real clocks you can achieve with your card.
stock
gpu/shader
575/1350
594/1404
621/1458
648/1512
675/1566
702/1620


Use ATItool to clock to any setting then use RivaTuner or Everest to check your ACTUAL clocks. If someone can get a screenshot of a GPU clock not on that list or in the same repitition please upload it.
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post #2 of 21
i have this with the 8600GTS too 742 max clock on the GPU.....higher than that was not possible.....(some sort of restriction) or the same thing descibed in the link above....
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post #3 of 21
Thread Starter 
Check Rivatuner to see if you are at 729.
This interval thing may only affect 8800's
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post #4 of 21
experiment: when i set the clock to 692mhz, it actually is on 688mhz....shader clock @ 1512mhz
And @ 722mhz GPU its actually @ 720, and the shader clock @ 1566...the shader clock remains the same between 688mhz and 720mhz......
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post #5 of 21
Thread Starter 
8600 series seems to be on a different clockset. Anyone else with 8800 or 8600 to confirm either of our clocks?
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160gb WD Scorpio Black Raid 0 Slot load Windows 7 x64 19" NEC Flatron 
PowerCase
400w 1u server (modded) 50 Cal Ammo Can (Fully Custom) 
CPUMotherboardGraphicsRAM
q8300 EVGA 750i FTW nvidia fx 4000 pci 4x2 ddr2 
Hard DriveOptical DriveCoolingOS
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post #6 of 21
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post #7 of 21
I posted an article in the news section two months ago with the FULL list of 8800 clock bands.... let me go find.
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post #8 of 21
This is most likely just mis-communication between ATI tool and Rivatuner. That are ATI Tool should no be used, and Riva Tuner will allow your to OC correctly?
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post #9 of 21
Once again...
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post #10 of 21
Quote:
Originally Posted by trendy View Post
This is most likely just mis-communication between ATI tool and Rivatuner. That are ATI Tool should no be used, and Riva Tuner will allow your to OC correctly?
this occurs with any clocking tool on mine...
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Samsung 40" TV Razer Lycosa/LogitechG13/Belkin n52te Antec 650W triple rail Thermaltake shark bigtower 
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