nx7800 gtx 512 oc

A

adrian kratisto

New Member
im new to overclocking.
I believe my msi geforce cards can be oc. They came with oc options. I want to use myvvidia control panel to oc these. IM not sure how to do it. Do i go in increments of 3 for both core clock frequency (550) and memory clock frequency (1.7)


start with 553/2.0 which is + from default? How does it work? whats the ratio?

how far can i go?
 
you sure its a gtx? i dont know if they go as "low" as 550mhz do they? mine was default at 650mhz.
you overclock the core first, in increments of 5-10. if you start to get "artifacts" or basically the picture turns bad, then you turn it down around 20mhz... then repeat only for memory.
then, test it by playing games on the highest settings you possibly can to stress it. if you get more artifacts, then lower each another 5mhz to create more stability.
my gtx is clocked at 702mhz and 1.78ghz
i can get it to 718mhz and 1.82ghz but sometimes gives me artifacts so i underclocked a bit.
EDIT: sorry! the title reads 7800gtx... i thought it said 7900 lol
 
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"you overclock the core first, in increments of 5-10. if you start to get "artifacts" or basically the picture turns bad, then you turn it down around 20mhz... then repeat only for memory."

ok so i move the core slider up 5-10. If i start to see artificats i move the core slider -20mhz?


"then repeat only for memory"

repeat what?
 
repeat the process with the memory clock. memory speed matters a lot for video cards.
yes, if you see errors or blotches on the screen, then move the slider back down 10-20mhz to make it more stable. same goes for memory.
normally i reboot after this... then try maxing out video settings in one of your favorite games... one that uses a ton of GPU processing power, and test for artifacts. 3dmark06 is also a good test to run for artifacts.
theres two clocks on a video card, "core" and "mem" is normally what theyre referred to as. ones the actual processing module and ones where all the graphics data is stored.
 
If your using coolbits (which it sounds like you are) you can select "detect optimal settings and clock upwards from there.. saves doing the first few increments i found.
 
absolutely right. im gonna go off coolbits and work my way up

I tested it using coolbits and at a certain point it told me my hardware couldnt support my desired frequencies.

Is this the limit?
 
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well, if it tests and it comes up with errors then you KNOW its not stable. the only way to tell for sure if its 100% stable is to play the games and never get artifacts.
 
Do i go in increments of 3 for both core clock frequency (550) and memory clock frequency (1.7)
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You can start off a little higher, maybe six or seven mhz for the core, ten or twenty for the memory, then when you need to start lowering the speed take it back up in smaller increments.

start with 553/2.0 which is + from default? How does it work? whats the ratio?
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For the memory thats the right idea, but the RAM is measured in Ghz, so its actualy 1700 Mhz, and your raising it 300 Mhz, not a good idea for one step ;)

how far can i go?
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Only one way to really find out, all cards scale differently. Your memory should be able to go up to 1800 Mhz at least though because its 1.1 ns (rated at 1800 mhz).

Try using rivatuner to OC, it has some other neat options also.
 
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