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Shader clock

post #1 of 6
Thread Starter 
I've done some research, but all of the posts, or information in general, I have found is mostly outdated.

I saw a post here, too. But it was over a year old.

I thought I should be able to get more performance out of my 8800GT, so I overclocked it of course So far I am at what seems to be my max, with a 766/1915/919, core, shader, memory, respectively. I couldn't push past it, nothing was stable, not even a half megahertz. So, I let it be for a while, but just recently thought of something. I had noticed that I had an option to link Shader and Core by 300MHz, and it had been enabled by default, so I left it.

But it got me thinking. Maybe one of the two [core, shader] is OC'd too far, not both. Maybe if I unlinked them and found out which was OC'd too high, I could OC the other and get more performance. I started with my Core first, and before I stopped, to write this, I got it to 781 stable, and didn't try higher. However, I started reading a little bit, and noticed some posts and links saying that shader and core are in a ratio together, which is why they are linked.

Basically I made this to see if it is ok to leave my shader at 1915, and crank my core up. I know nothing about the Shader clock, so I don't know if I will lose performance, because they are out of synch, or gain performance because I'm OCing harder. I don't know if it is unstable when both the Core and Shader are being increased, or just the shader, or just the core, which is why I am writing this.

So far, I have seen that the Core can be pushed higher than 20 more MHz, leaving the shader at 1915, which leads me to believe that the shader is holding me back. Seeing the potential, however, I would rather not leave my core way lower than it could be...

I'm really confused, tired and hungry. I hope this was intelligible.
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post #2 of 6
Have you tried it the other way yet? What I mean is have you left your core clock at 766 and tried to increase your shader clock to see if that would go up? I could be wrong but isn't the shader clock more important for gaming then the core clock?
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post #3 of 6
Thread Starter 
The shader clock is at it's maximum (According to everest it is 1890), and my core is at 771, but can go much higher.

My understanding was the opposite actually; the shader gives only minimal improvements to gaming performance, if you're overclocking.
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post #4 of 6
There is no point in leaving the clocks linked. It's very rare that both will hit their max stable OCs that way. If I brought the coreon my GTS 512 to it's limit, the shader clock would be almost 200MHz past it's stable max, if they were linked.

As for performance, it really depends on the game. Some are shader heavy, some aren't. Shader heavy games logically benefit more from a higher shader clock.
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post #5 of 6
I've never really understood the linked sliders in Rivatuner...why do some hting like that? why not link the memory on ther as well?

Do most cards actually OC repectively on the shaders and core? Mine didn't...my shader can go higher then my core
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post #6 of 6
Hi

The best way to find the highest results is to unlink them and clock them to their limits individually. First being the shader clock. Once you hit the shader clock limit, tackle the core clock and find its limit, then finally the memory.

I can't really 'see' which clock really improves real world performance, but from benchmark results, shader clock clearly has the largest impact. I think i see what you're saying about the core 'potential'. I also ran into this with my GTS. I could squeeze a bit more shader clock at the expense of a quite a bit of core clock. I went with the higher core clock and sacrificed minimal shader and it yields better results and better stability in my case.

I have quite a bit of experience with the 8800GT, particularly the MSI model Here with the zalman-like cooler. I've achieved good stability from that one with ~700+/1890/1050 (2000MHZ). This with fan @100% which for this card is quiet.

Cheers
Edited by Nellys197 - 6/22/08 at 3:17am
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