I am not sure if this is the right forum to ask, so please apologize and direct me to the right place if not.
Currently I am working with 2x HD5970 for an openCL application, and I am using a MSI 790FX-GD70 motherboard. It has 4 PCIe slots and claims to support up to 4 graphic cards.
But the MSI web site says that when you use 2 PCIe slots, they are at 16x, but when you use 4 PCIe slots, the speed of each one is 8x.
So my question is: Can I work with 4x HD5970 at PCIe 8x (with a transfer speed penalty), or HD5970 can only work at PCIe 16x?
Thanks in advance for any insight about this