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DDR3 vs. DDR5?

Last response: in Graphics & Displays
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Anonymous
a b U Graphics card
August 16, 2010 6:01:54 PM

Hello,

I have been researching video cards lately and I am searching for the best bang for the buck. I know many stats can be misleading to sell cards on.
My question: Is there a significant increase in performance of DDR5 over DDR3 that I should exclude DDR3 cards from my search?

More about : ddr3 ddr5

a c 194 U Graphics card
August 16, 2010 6:07:48 PM

Dont exclude DDR3 cards from your search, there are many DDR3 cards that are good, especially in the $100 and below segment. The memory only minimally affects performance, the GPU itself is far more important than GDDR3 or GDDR5.

GDDR5 is quad pumped so its transfer rates are twice as high as DDR3, so if a GDDR5 card has a 128 bit bus and a DDR3 card has a 256 bit bus their memory bandwidth will be basically identical.
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a b U Graphics card
August 16, 2010 6:12:07 PM

The difference is you "quad-pump" the clocks or GDDR5 to get the transfer rate, while you double for GDDR3.

This results in much higher memory bandwidths compared to GDDR3 bases cards, given they have the same bus width and memory speeds.
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a c 376 U Graphics card
August 16, 2010 6:44:43 PM

You simply should not be choosing a card based on memory type(unless it is actually the same card with different options.) The things that really matter are price and performance. Picking one technical aspect that goes into how well a card performs and giving it undue importance isn't going to help you make the best decision.
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August 16, 2010 10:15:52 PM

An interesting test. Take a 4870 and a 4850, two cards that really only differ in that one has GDDR5 memory and one has GDDR3, clock them at the same speeds and see what happens.

These guys already did it. Translated from French:
http://translate.google.com/translate?js=y&prev=_t&hl=e...
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a b U Graphics card
August 17, 2010 3:32:52 AM

If you are searching for a video card, comparing memory type tells you nothing. Absolutely nothing. It's like basing what kind of new car you are going to buy by how many windows it has. No relevance at all, really.
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