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Question about pipes and clockspeed.

post #1 of 4
Thread Starter 
I know the performance ofa graphics card depends on many factors: architecture, clock speeds, memory speed, mem bandwidth, etc.

Is a good measure of gfx performance in terms of core clock and pipes, ceteris paribus, to multiply core clock *pipe?

As in, 400MHz core * 16 pixel pipes = 6400 units of something
600 * 12 = 7200 units

So even though one has 16, it has less output power than the other because of lower clocks?
post #2 of 4
Yes, I beleave you can do a VERY ruff calculation of a videos cards power that way.
post #3 of 4
Im a math physics guy (meaning I know there is a possible combination for any units!), the problem with your example is it does not include all of the variables of a graphics card.

I think that is a problem....

In order to formulate a proper equation for the overall strength of a card you would need to include all variables included in a card.
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post #4 of 4
First of all, the pauldovi guy is correct when we say, we need to understand all the variables, its not right to go dividing and multiplying random numbers by eachother, because your simply getting a collection of numbers, that could relate to the speed of the fill rate, or the number of pixles it can output at a given resolution a second.

You need to understand that, a card will not always be using 100% of its resources, thus it will not have a power output of X as a constant, nor will it always have a output of X if it is ideling, its not easy enough to divide random numbers of core clocks and memory either, because the memory maybe more full at any given time, thus requiring more power. Along with this is the core, if the core is underload, the voltage maybe different. Similarly, take an X800 Pro and an X800 XT PE, even though they use the same core, the voltages could be much more differnet in effect that, to maintain the X800 XT PE core speed, more voltage is given, along with more Mhz and more pipes, thus it will be a hotter card than the X800 Pro that has a slower clock, and 4 less pipes.

Take this for another example, old Pentiums and AMD's, did have a Voltage of around 2 Volts, where as modern processors are around 1.2-1.6, and getting actually less everyday as Intel/AMD find new things with Silicone wafers etc. The processors in 198X and 199X also have much lower Mhz ratings than those of today aswel, and even though their voltages were higher, the actual heat produced was not as much as the 1.2-1.6 voltages of today.
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