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why don't video cards overclock as well as CPUs

post #1 of 18
Thread Starter 
i have an ATI HD5670 the GPU is 775Mhz and the memory is 1000Mhz, i can clock it to about 795Mhz GPU and 1030Mhz memory.

what is up with the meager clocks on video cards? we have CPUs that default at 3.2Ghz why havent we seen at least a 1Ghz or 1.5Ghz GPU card? why dont they overclock much??
post #2 of 18
Quote:
Originally Posted by jcrew3002 View Post
i have an ATI HD5670 the GPU is 775Mhz and the memory is 1000Mhz, i can clock it to about 795Mhz GPU and 1030Mhz memory.

what is up with the meager clocks on video cards? we have CPUs that default at 3.2Ghz why havent we seen at least a 1Ghz or 1.5Ghz GPU card? why dont they overclock much??
more cores in a smaller space. they would be way too hot to clock that well
    
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post #3 of 18
Graphic cards have like, hundreds of cores, consumer CPU's have like, 4 at the most (i7 for example). Imagine trying to run those hundreds of cores at 3 or even 4GHz, bad idea.
Edited by TurboHertz - 6/11/10 at 7:19am
    
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post #4 of 18
The two main reasons are

-Different architecture. (The chips are designed way differently)
-Different manufacturing process. (The chips are manufactured differently)
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post #5 of 18
Thread Starter 
wait... so a video card has hundreds of CPUs?? ( please excuse my noobnes ) my card has 400 stream processors, does that mean 400 CPUs? well i guess that makes since then
post #6 of 18
Quote:
Originally Posted by jcrew3002 View Post
wait... so a video card has hundreds of CPUs?? ( please excuse my noobnes ) my card has 400 stream processors, does that mean 400 CPUs? well i guess that makes since then
Not a CPU, a CPU is the thing in your CPU socket under the cooler, it's a GPU, GPU's have hundreds of cores called "Stream Processors" or CUDA cores" and there is also Shader units and so on, they are what processes the 3D models and textures, and display the pixels on screen.
The reason they have many hundreds of cores is because the above mentioned tasks can be processed in parallel by the GPU, however the work the CPU usually does can't be processed like that (unless it's video ).
Edited by TurboHertz - 6/11/10 at 7:07am
    
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post #7 of 18
Quote:
Originally Posted by sLowEnd View Post
The two main reasons are

-Different architecture. (The chips are designed way differently)
-Different manufacturing process. (The chips are manufactured differently)
/thread
post #8 of 18
The main reason is because you can't increase volts as easily. How far do you think your CPU would get if it was stuck at stock voltage? I think graphics cards do pretty well considering 95% of them aren't volt modded/voltage adjustable.
    
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post #9 of 18
Quote:
Originally Posted by jcrew3002 View Post
wait... so a video card has hundreds of CPUs?? ( please excuse my noobnes ) my card has 400 stream processors, does that mean 400 CPUs? well i guess that makes since then
In Nvidia's case, an SP stands for Stream Processor. The higher end cards have over 200.

In ATI's case, an SPU stands for Stream Processing Unit. The higher end cards have over 800.
post #10 of 18
Thread Starter 
ill have to keep up with my research. Thanx all!
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