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ATI Radeon 5770 - ddr5

post #1 of 4
Thread Starter 
I thought ddr5 would be pretty good until I noticed 5770 is 128 bit. Does it mean ddr5 serves no added benefit to this card compared to cards that are ddr3 but 256 bit? Or is there something I am missing?
post #2 of 4
Quote:
Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.
Taking a base frequency of 400Mhz
800MHz (effective) DDR3 * 256 = 204800
1600Mhz (effective) DDR5 * 128 = 204800

Practically the same, until you notice new DDR5 cards have higher base freq than old DDR3 cards, regardless of bus width

GDDR5 FTW
Edited by ronnin426850 - 8/23/11 at 10:19am
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post #3 of 4
Quote:
Originally Posted by ronnin426850 View Post
GDRR5 FTW
post #4 of 4
The 5770 is a very potent card. It's almost as good as a GTX 260. The smaller bus width is no problem due to the GDDR5 on the ATI card here. In fact, it helps with CrossfireX to the point that dual 5770s are, at minimum, equal to a 5870 if not better.

Three 5770s even scale well.
     
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