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9800gtx overclocking

post #1 of 7
Thread Starter 
I just got a new 9800gtx today and was wondering if anyone had any recommended overclocks for this thing. Now that I think about it, i can just mimic the clock speeds of the overclocked versions of this card for sale... but input is still fun. What speeds are good/safe to run this card at?
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Asus A53s
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post #2 of 7
800 Core ~ 2200 Shader ~ 1200 Memory

Those are pretty easily obtained clocks. I think youre better off going for balance rather than just OC the crap one in particular.

Make sure you scan for artifacts using ATI Tool - whatever clocks you have.
Edited by keyboard_commando - 5/24/08 at 4:41am
post #3 of 7
As high as you can get them stable really, it all depends on how cool you can keep it, and how you balance out core to shader/memory.
    
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post #4 of 7
Thread Starter 
I see this quite often, three values... I only have ntune right now for overclocking... What programs can I use to over clock the shader memory?
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post #5 of 7
post #6 of 7
Just got one too at 700/1100 default core/mem clock settings. I'm using 3Dmark06 and rivatuner to stress the card for O/Cing runs. At the card's default clock and fan setting, it runs up to 90C, with with SM2/3 scores of 5050/5000. No problems. Sounds a bit warm, but that's not my call. This is all Nvidia 'plug 'n run' in a 70F ambient room . . . and it runs fine.

To control temps during initial O/C runs, I set the fan to 100% with riva. Gcore temp stayed at 70C, but the card would not complete a 3Dmark run at 825/1100 (core/memory). It will not run at 825, temp was not factor here. That's my chip's top stop.

At 800/1200, it ran fine and completed all 3Dmark runs with SM2/3 scores of 5490/5240. Temp remained at 70C.

That fan is really noisy at 100%, so I started to slow it down. I found at Any core temp above 70C (@ 800/1100), 3Dmark would artifact/freeze. I experimented and found that a fan speed of ~ 75% finally tamed the temp down to 70C and allowed 3Dmark to complete.

The SM2/3 scores were about liner with the O/C. ~ 5%. It needs the fan at 75% to maintain a stable O/C, but is right on the edge. Anything > 70C starts to artifact. So

1) That required increase in fan noise,

2) plus no temp headroom for increased summertime ambient temps,

3) plus a virtually undetectable 5% performance boost,

4) plus "balancing" down to a more sustainable O/C renders any performance increase even more undetectable =

O/Cing this card is primarily for the fun-factor, but (pragmatically) is really not worth the trouble.
post #7 of 7
Thread Starter 
I don't mind saying that so far, I'm perfectly happy with this card at it's stock ratings ... I'm coming from a 9600gt (great performer for the $$$) so it's better than what I used to have. I'm playing AoC and Crysis right now, and they are already running very smoothly without an overclock so... I'll leave it up to the future as to whether or not I will need to overclock this card, but I'm leaving it alone for now to keep from interfering with my gaming experience.
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