games lags after short gameplay

n-force

Honorable
Aug 7, 2013
35
0
10,540
if i minimize and return the game lag stops so i gotta minimize the game to play smooth card 6870 games gta 4 and bf3 when anti alising 4x bf3 takes less time to lag its related to graphics card memory i guess i watch it with playclaw in bf 3 it s about 980 mb used in gta it goes 1004 and starts lagging just right then.
changed psu yesterday didnt help cleaning stuff didnt help cpu x4 965 temp max 59 gpu tried 2 cards xfx and sapphire both 6870 both 1 gb so i m kinda confused what can be causing a problem like this and pls if u have playclaw and bf3 tell me how much memory u use at ultra 1440x900 with a directx11 card.
edit:btw gpu temp about 75 max for xfx.
 

n-force

Honorable
Aug 7, 2013
35
0
10,540
i switched turbo fan mode that lowered temps in bf3 cpu was about 55-56 gpu was about 74 and problem did occurred again i tried using a program named heavyload fps drops 1900 from 3100 in 30 minutes now i ll test gpu alone. BTW in assasin s creed 4 black flag i m only lowering msaa to 4x and shadows to very high (low soft shadows) others are all at allowed max no problems occurs and gta 4 starts to lag in just a while when everything maxed so i came to a point only cpu intensive programs and games lag.games i play bf3(occurs),payday 2(occurs),gta 4(problem occurs in shorter amount of time),cod 4,black flag,outlast no problems in these 3 games.
edit:i forgot to mention windows 7 64 bit clean install didnt solve my problems and about memory stuff i think it s because cpu cannot answer gpu speed and lags.