I currently run battlefield 3 on low to avoid performance hitches while playing online. I believe I am being held back by my cpu. My question is if I were to upgrade my cpu to a qx6850, the fastest quad core cpu my current motherboard supports, would I see a significant upgrade in performance over my e6550? It looks like I can acquire this cpu for around $200 off of ebay. Compared to the roughly $400 it would cost to upgrade to a more current mother/cpu/memory combo. Obviously the $400 option would net me better performance but I am poor so I would like to go with the cheapest viable option but I also don't want to just throw money away if the qx6850 wont give me the boost I want over my current setup.
honestly you should hold out and just bight the bullet and when you save up the money get a sandy bridge cpu and ram mobo. its either 200 now and 400 later or just 400 now. the 200 dollars would be a band aide to the bigger problem.
Bf3 needs a good fast quad core to be good online, dont let people tell you otherwise.