processor -intel i5 2400(3.1ghz)
motherboard- MSI H67MA-E35
ram-CORSAIR 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333
gpu-zotac gtx 560 1gb
psu...xfx proseries 450w
this system costs 640$
and an another system
processor-amd FX - 6200 (3.8ghz)
motherboard-asus M5A97 PRO
ram-CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866
gpu-sapphire 7770 1gb
psu.xfx proseries 450w
this system costs 620$
among this which offers best gaming at 1600x900 at high details like bf3,the run and other than game i do a lot of decompressing using 7zip,heavy internet user and also hear music and watch movies..
no that is not that important for gaming and everyday use for gaming i5 2400 with gtx 560 is the way.
the hd 7770 is on pair with hd 6850 which is lower in performance then gtx 560.gtx 560 is on pair with hd 6870 so the better choice for gaming gpu will be gtx 560.
for gaming cpu intel does well job in making of gaming cpu and an i5 2400 is very good and fx chips are not good for gaming even after overcloking it doent matter whether its 6 core processer most games uses less cores an phenom ii x 965,970,980 will do better then fx 6 cores processer in gaming and i5 2400k does better then that cpus i mention there so for gaming cpu i5 2400 will be an better choice. .
i will use only stock cooler to how much extent i can overclock and i can also downgrade the mobo to asus M5A97 which is 25$ cheaper than pro version so with that 25$ can i upgrade to a good gpu like 6850... will that be any good ?
no the whole system you are getting with i5 and gtx 560 is good for overall performance the hd 6850 performs less then gtx 560 and hd 6850 performs like hd 7770 that u have in amd so why are you going to amd one if the intel is good go with intel built system in that two option or if u want amd then get phenom one that will be more better then fx chips really.