Proper hardware RAM disk. Years back there were some hardware RAM disks such as Gigabyte i-RAM floating around but nobody makes such things anymore. Today we have adequately fast interconnects (PCIe 3.0), high density DRAM (now at 4Gbit, 8Gbit should be around in a year), though finding the memory controller might be a problem. take one PCIe 3.0 x16 board slap some eight-or-so DDR3 slots on it add a lithium polymer battery-UPS to make the bits stay flipped when it's disconnected from 5VSB find a bootable controller that can do it all You get a 64GB(-128GB+) OS/apps RAM SSD that can deliver 10-16GB/s (PCIe 3.0 x16 cap) at nanosecond-scale access latency. Flash SSDs would be nearly obsolete - until MRAM or such comes around to desktops near you. What would it be, that imaginary piece o' hardware, your nerdy heart desires?