That's a top end SLI rig... similar to the setups I run. To run BF4 with great graphics, you'd be fine with a sub 2,000$ computer. AMD just released a new line of graphics cards that are fantastic for less than 500$, and Nvidia is dropping prices as well. If I were to budget for a computer specifically built for BF3 and similar games, I'd budget it along these lines:
Processor - 320
Motherboard - 120
Graphics Card - 460
RAM - 80
Case - 100
Power Supply - 120
HDD - 50 for HDD (Give or take if you want a SSD)
CD Drive - 10
Monitor - 130
Under 1400$ for a machine that could easily play it on max settings with current hardware and major room for improvement. (Multiple graphics cards, RAM upgrade, SSD etc) - But if you're only gaming on one monitor, you really only need one graphics card. Unless it's a 4k res monitor, of course.
Processor - 320
Motherboard - 120
Graphics Card - 460
RAM - 80
Case - 100
Power Supply - 120
HDD - 50 for HDD (Give or take if you want a SSD)
CD Drive - 10
Monitor - 130
Under 1400$ for a machine that could easily play it on max settings with current hardware and major room for improvement. (Multiple graphics cards, RAM upgrade, SSD etc) - But if you're only gaming on one monitor, you really only need one graphics card. Unless it's a 4k res monitor, of course.