AMD Cayman info (or rumor)

[SpuTnicK]

No, a VLIW4 SP is most likely a tad slower than a VLIW5 SP. But a 1536 (384) shader VLIW4 chip will have 20% more real useful SPs than a 1600 (320) VLIW5 chip.

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Your number of 20% higher performance is based on 20% more shaders.

First of all, i didn't came up with this 20 percent figure.
Secondly, read this carefully