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question about effective memory clock

post #1 of 10
Thread Starter 
i am ordering a computer TODAY, as in i am ordering all of the parts and everything, and i am wondering why the gts 450 has 3760MHz Effective Memory Clock and the 5770 has only 1200MHz Effective Memory Clock, the 5770 is supposed to be better so why the big difference in favor of the gts 450?
post #2 of 10
You con't compare video cards just on clock speed, because for the different companies the clock speeds all mean different things.

Just stick with the 5770 because it is the better card.
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post #3 of 10
5770 has quad data rate memory (GDDR5) meaning you have to multiply the 1200 Mhz by 4 so its really 4.8Ghz.....for whatever reason the specs you were looking at didn't point that out i guess.
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post #4 of 10
Thread Starter 
i figured as much, but i am still wondering why the huge difference? is it because the gts 450 has fewer processors? or what?

oh and the gts 450 has gddr5 as well
Edited by phantasmor - 1/25/11 at 7:59am
post #5 of 10
Ya both have Quad data rate memory
GTS 450 940Mhz x 4 = 3760 effective memory
HD 5770 1200Mhz x 4 = 4800 effective memory
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post #6 of 10
Thread Starter 
oh.... that is not the way they worded it, they said 1200Mhz effective memory
post #7 of 10
Ya most sites will say: Effective Memory 1200Mhz (4.8Ghz)
Guess they screwed up that spec page.
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post #8 of 10
Thread Starter 
but i am guessing that effective memory is not the best way to gauge because the 5870 has the same as the 5770, and i know that the 5870 is worlds better
post #9 of 10
You have to take the effective memory, core clock speeds, and most importantly Stream Processors (For ATI Cards) and CUDA Core Processors (Nvidia Cards) into factor. The Processors is the most important thing when it comes to gauging performance. I believe the 58xx series has 1600 Stream Processors ( Don't hold me to that ) and the 5770 have 800 for sure. That's the main reason you get twice the performance.
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post #10 of 10
Quote:
Originally Posted by phantasmor;12136194 
i am ordering a computer TODAY, as in i am ordering all of the parts and everything, and i am wondering why the gts 450 has 3760MHz Effective Memory Clock and the 5770 has only 1200MHz Effective Memory Clock

It doesn't favour the GTS450. The 5770 is 4800Mhz effective.
Quote:
Originally Posted by phantasmor;12136194 
the 5770 is supposed to be better so why the big difference in favor of the gts 450?

The 5770 is faster
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