No you can not, Intel screwed things up here.. On the PCIe bridge on the GPU, they decided to use the same 64-bit, prefetchable address space as the resizable GPU BAR itself and Linux PCI code won't move this resource to make room for the GPU BAR.
It is possible via a kernel patch, but it's a janky hack that causes other issues. The only real solution here is a BIOS from SuperMicro.
An update on this. I have the new BIOS, the new option is available however it causes the system to hang during post when rebar is enabled and any VGA device with rebar support is installed (Intel, AMD or NVidia). I am waiting for an update from SuperMicro at this time.