As title, can i know what is the best Oc rate for my card?
Me and my friend also playing dragon nest currently but my friend using sapphire hd7770 me using sapphire hd 7850 oc
but y i'm so lag on graphic n his smooth

Here is my PC spec :

PROC : Intel core i5-3470 3.2ghz
MOBO : Asrock z77 extreme 4
RAM : Corsair x2 4GB
GPU : Sapphire HD7850 oc 2GB GDDR 5
PSU : Xigmatek 500w
HD : WD 500GB
Casing Fan : 6x 12cm Cooler Master 2000rmp

Can i know how much can my card being oc?
any1 here hav the same gc with me that playing oc?
If yes can please provide some guide of ocing rate.
THX