256-bit
Information about AMD's upcoming Cayman core is still hard come by, but we have at least one new fact that we can rely on.
Cayman has 2GB of GDDR5 memory and the controller of choice is 256-bit. While in terms of RAM quantity the card beats Nvidia's GTX 580 which has 1.5GB, we can definitely say anything over 1GB is overkill for most users, but it looks good for marketing purposes.
Despite its 256-bit bus, Cayman Radeon HD 6970 looks to be quite close to GTX 580 performance, but we still don’t have anything better than this claim. Launch appears to be set for the week of November 22nd and samples are supposed to get to AMD selected press very soon.
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