AMD's next-generation enthusiast graphics processor (GPU) is shaping up
to be something more unique than expected. The GPU codenamed "Tahiti" is
going to be bleeding-edge in terms of its feature-set. To begin with,
there's talk that it will make use of PCI-Express Generation 3 (Gen 3)
system bus, which will give it a mammoth 32 GB/s of system interface
bandwidth. Next, Tahiti will use a number-crunching architecture that's a
generation ahead of even the VLIW4 it released with Cayman. VLIW4 will
make up for most of the HD 7000 series, but not the top-end Tahiti GPU,
it will use what AMD is referring to as "CoreNext Architecture", which
is expected to boost performance per square millimeter die area beyond
even what VLIW4 manages.
The most recent piece of information is bound to shock and awe. Tahiti,
it appears, will use the XDR2 memory interface. XDR2 is an ultra-high
bandwidth and power-efficient memory bus that's competitive with GDDR5,
maintained by Rambus, which is claimed by it to be a generation ahead of
GDDR5. It's not like XDR2 will be exotic to AIBs, the XDR architecture
is used in game consoles where the high-bandwidth offsets low memory
capacity by allowing quick streaming of texture data. Rambus licenses
XDR memory chip manufacture to notable high-volume vendors. Nordic
Hardware compiled data from various unreliable sources to sketch out
what Radeon HD 7900 series could look like.
Source: NordicHardware
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