What is a good drive to run p1999 off?

[Baler]

Ramdisk

Edit: Is literally the fastest you can get at the moment. And yes you will load faster than people on SSD (in general)
No don't use USB,. even USB 3.0.
A large quality SSD 1+TB big is your next goto after ramdisk.

ramdisk can pull ~3,000 mb/s
SSD can pull ~500mb/s
for example (not talking about raid setups, which still won't beat ramdisk atm)