LuxMark - The OpenCL CPU&GPU benchmark

[jogshy]

After taking a look at the code, I wonder how dependent is this test on the PCI express. I've been never a big fan of passing tons of data by the bus.
Any of you can make a quick test pls? My BIOS does not allow to change the PCI multiplier... but I bet if you put a monster GPU and you put it to 2x a modest GPU running at 16x might be faster.

Also, I think the automatically assigned work size of 64 thread/block may cause an slowdown.

My ... strange.... results:

OpenCL - GPUs only ( a Radeon 5750, catalyst 11.2 ) -------------> 1784 marks


Native CPU ( an obsolete i7 920 ) ----> 3342 marks

So, in my case, the CPU is 2x faster than the GPU... Shouldn't be a GPU faster than a CPU rendering? That's the whole point of Octane, VRayRT and other GPGPU renderers after all...