how much is laptop worth

model: Asus g751j 17.3" screen Intel Core i7-4710HQ CPU @ 2.50GHz Ram: 24GB 1 TB drive + 256GB BluRay/DVD NO touchscreen or pen capability HDMI Its in really good condition because this thing has been my baby through college. Wanting to sell it and try to build a budget desktop, but dont really...

Has anyone run 3way or 4way sli/cf? What was it like? What games did you found scaled well? In the end do you think it was a waste? And finally i read somewhere that adding the 3rd card eliminates microstutter if any, is this true?