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[Tom's] GDDR5 basics

post #1 of 2
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In their Radeon 4870 review Tom's hardware makes an interesting point in regards to the GDDR5 (page 3 of the review).

Quote:
GDDR5 uses an 8-bit prefetch, like GDDR4, but ushers in more innovations. First of all, GDDR5 uses two clock frequencies, CK and WCK, the latter being twice as fast as the former. Commands are transferred in SDR at frequency CK; addresses are transferred in DDR at frequency CK; and finally, data are transferred in DDR and at frequency WCK. In the case of the Radeon HD 4870, which uses GDDR5 at 900MHz, commands are transferred at 900MHz SDR, addresses at 900MHz DDR and data at 1800MHz DDR.

Tom's
Radeon HD 4870: Better Than GTX 260!
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post #2 of 2
I'm well aware that GDDR and DDR are completely different but I wonder if the next generation will borrow some of those innovations used in GDDR5.
    
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