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[Raistmer]

There are many mentions about coalesced reads from memory and how it can speedup computations.
But what about writes to memory? Should they be ordered too? Some feature like CPU write-combining buffer exists for ATI GPU (and for GPU at ll) ?

[n0thing]

The writes too should be ordered - linear writes with vec4 will give you the maximum bandwidth.

I have a benchmark which gives about 100 GB/s global memory write speed on 5870 (and 50GB/s on 5770) - it uses coalesced writes as I mentioned.