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Core, shader, memory... all related?

post #1 of 10
Thread Starter 
Are they related?

I heard people saying by having a greater shader freq, you can achieve a higher core freq. Does the speed of the memory affect the speed at which is the core can run etc....

Are the speeds related and/or effect the other freqs?
post #2 of 10
If your Core and Shaders are linked, then upping the core automatically ups the shader to stay in proportion, but other then that theres no real correlation between core/shader/mem, get them all as high as you can while still keeping stable
    
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post #3 of 10
By default (stock drivers) nvidia's cards have the GPU clock and the shader clock linked together. Say the GPU has 500MHz, the shader is linked thru a 3x multiplier, thus the shaders are at 1500MHz. If you OC the GPU to 550MHz, the multiplier stays locked by default, so the shaders will be @1650MHz.

Rivatuner can however unlink the two clocks, so that in practice the multiplier between the gpu and thaders is changed. So, by clicking "unlink shader clock" (or som' like that) you can OC the GPU core and the shaders independently.

Memory speed is 100% independent.
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post #4 of 10
very well put ^
    
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post #5 of 10
Thread Starter 
Okay, i overclock with core and shaders unlocked.

You are saying that all three are independent, so the higher the freq i can get on my shaders won't affect the speed i can achieve on the core?
post #6 of 10
Quote:
Originally Posted by alex98uk View Post
Okay, i overclock with core and shaders unlocked.

You are saying that all three are independent, so the higher the freq i can get on my shaders won't affect the speed i can achieve on the core?
Nobody said that, it's just that it is possible to clock them independently. Let's stick to the GPU, it has two clock speeds: core and shader.

The GPU can take only so much OC, so let's say you want to see what is the maximum core clock without touching the shader clock. Say the VID card has the following stock clocks: 500core/1500shader/2000memory.

We leave the 1500sh/2000mem fixed at stock and OC the core, say we find a maximum of 650MHz.

Now we found the max core, we must find the max shader: leave 500core/2000mem fixed and say we find the max shader speed of 1950MHz.

It is rare that you can OC all the GPU to 650core/1950shader, most likely you'll have to back down a little for both the core and the shader clocks to 630/1850 for example.

I tested this on a 7300GT. The shader OCing sucks a lot of power, generates a lot of heat, but it also rips the most benefits. The core clocks and the shader clocks are physically tied together, since they are on the same chip, so while you can clock them independently the maximum OC is not independent.
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post #7 of 10
Thread Starter 
Ok, thanks. Rep+
post #8 of 10
You can probably clock the shader higher with a lower core speed, and vice versa.

The only way they are linked is that they all share the same reference clock (the 27MHz coming from the crystal occilator on the board), the same power source, and they dump heat to the same place.

The linked setting you see when OCing is just a property of the ocing software, not any innate hardware characteristic.
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post #9 of 10
ok how do you know when the max oc has been reached?
edit: is it also based on GPU temps similar to cpu overclocking? if so please give me rough idle and load gpu temp for my evga 9800gx2. thanks
Edited by merwan - 7/7/08 at 7:47am
post #10 of 10
Use ATI TOOL to scan for artifacts if your see yellow and errors you gone over.... let it run 15-20 mins

Also watch your temps!
Edited by Kidem - 7/7/08 at 7:53am
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