Ordered 5x 60cm versions today. Figured, what the heck.. I can always lay GPUs on their side outside of my rig if too long.
What PCIe version are these? 1.1, 2.0 or 3.0? Cause bandwidth doubles in each. Most PCIe slots are 2.0 I know, but plugging into an x16 PCIe 3.0 slot should yield... PCie 3.0 bandwidth?
I ask because I also do some CUDA computations, which requires some very high bandwidth. It would double my calculations is it is x1 PCIe 3.0 over x1 PCIe 2.0.
Theses won't give you extra bandwidth nor loose some, since the PCIe controllers are in the CPU and/or the Chipset depending on the platform you're using and in the GPU card, and theses controllers will set the PCIe speed this way : the actual PCIe speed will match the lowest PCIe revision of your hardware.
As USB3 wire are designed to support high bandwidth, I would expect theses risers to work well at 1x PCIe 3.0 speed.
I've ordered 3 of theses 100cm length risers, I'll tell here if they works well.