Rpcs3 doesn't need a Bios to run, since it's HLE'd. PCSX2 core uses LLE, thus it needs the PS2 BIOS.
My Rig:
OS: Windows 7 Professional 64bit SP1
CPU: AMD Phenom II X4 955 3.2 GHz Stock
Graphics Card: Nvidia GeForce GTX 560 1GB GDDR5
Motherboard: Gigabyte GA-870A-USB3 AM3+ Revision
RAM: Geil 4GB Dual Channel @ 1600Mhz