I multibox 7 accounts on a dell XPS 8700
4th Generation Intel(R) Core(TM) i7-4790 processor (8M Cache, up to 4.0 GHz)
16GB Dual Channel DDR3 1600MHz - 4 DIMMs
NVIDIA GeForce GTX 745 4GB DDR3
1TB 7200 RPM SATA Hard Drive 6.0 Gb/s
You have either OCed your 4790 or you are actually running a 4790k.
I currently run an I7-4790k at stock clock and it runs 4.0 GHz.
I have not attempted to run many bots, only one. I would imagine your computer runs them quite well though.
My specs:
I7-4790k Processor
16GB DDR3 2033MHz - 2 DIMMs
Radeon R9 295x2 (Currently only $600 on Newegg)
Corsair H100i (Watercooler for the processor, top mounted radiator, closed loop)
-Harddrive Irrelevant... although I have a 2 TB Western Digital HDD and a Samsung 840 Evo SSD.
You won't need more than 8 GB of RAM to do what you want, I just use 16 to future proof with 2 Dimms. Also, Dual Channel RAM is standard, so not really much point worrying about that, also the speed of the RAM matters little. Benchmark tests prove very little differences. Your harddrive won't matter, unless ofcourse you go SSD, you can pick up a small 840 Evo for around $80.
My build cost me about $3,000. But I can play any game on the market at ultra settings with well above 120 fps. On my 4k Monitor, I get about 80FPS on most games.
I've built probably 20 computers between my own, friends and clients. If you need help with a build, you are welcome to PM me.