The heightof the PCBcard-fixingdevicecan beadjustedaccording torequirements, so therequirementon the heightprocessingprecision of the fixing device is low;
The bottom mini PCIe slot accommodates half height cards (for WiFi, presumably) and you can go ahead and put an mSATA drive or full heightcard at the top.
That said, PC Perspective has put in some quality time with the DDRdrive X1, which places 4GB DRAM and 4GB NAND in parallel on a full height PCIe card, keeping that volatile memory of yours safely backed up on a static disk, just in case.