There's a some slightly incorrect info here regarding the ioDrives you all have been discussing (I worked at Fusion-io/Sandisk for 7 years building high-perf storage systems).
The SX/PX/300/350 are all the same drives. Same FPGA, same firmware, etc... The only real differentiating factor is that the SX300s are on Micron NAND and SX350s were released with SanDisk NAND after they bought us. They all have slightly different warrantied marketing specs for speeds and edurances as the only real difference. The rated capacities/wear life differences are just a factor of the factory over-provisioning at the drive/driver level, which is completely user-adjustable.
The cards by default will limit themselves to 25W under write workloads if they can't get a supported wattage metric from the slot itself. You can enable PCI-e power override to support up to 75W in a proper slot, but the full-height cards max out around 55W at peak write. None of the cards will ever hit 75W.
Current linux support is best handled by using the drivers over at RemixVSL:
RemixVSL
That's what I run in proxmox currently.