Originally Posted by Panderas
After that fat odl chunk of GDDR5 memory why dont the ATI have a better memory bandwith than the Nvidea counterpart...
It's not clocked fast enough to make up entirely for the difference in bus width:
RV770XT: 3.87GHz * (256/8) = 123.84GB/s
GT200: 2.2GHz * (512/8) = 140.8GB/s
So really, the two have a difference of 17GB/s. But, overall bandwidth isn't everything. The GT200's bandwidth is a 13.7% increase over the RV770XT, but that isn't a huge advantage given the cost of implementing the 512-bit interafce not only in terms of the actual cost to buy the card, but the additional die space it takes up. It's all a compromise to get the required amount of bandwidth to the processor, and ATI/Nvidia just took different paths to get there. The bandwidth difference probably isn't big enough to be THE deciding factor between the two cards anyway. Will the GT200 beat the RV770XT? Probably, but more bandwidth isn't likely to give the RV770 a better chance, the real competition comes in the form of the RV700, which thanks to the die size and power requirements of the GT200 Nvidia won't be able to answer to quickly by slapping two of them together (instead, they'll release a die-shrink version of the GT200).Edited by darkcloud89 - 5/26/08 at 8:08am