When i play Skyrim @maximum settings (without .ini tweaks ) Msi afterburner shows ~1400mb Gpu memory usage. When i apply all the .ini tweaks which increase image quality of the game , i see ~2750mb gpu memory usage in msi afterburner but i can play the game at constant 60 fps without any lag.How does it possible ? I know that with 2 Hd6970 2gb gpus games can use maximum of 2gb gpu memory and if i exceed it game should be start lagging. I donht understand this situation. Does msi afterburner shows wrong memory usage?
i7- 2600k @~5ghz
16gb Kingston Hyperx 1600mhz
2x Asus Hd 6970 Direct Cu II @940 cc 1450 mc
2x 2 Tb WD Caviar black 7200 rpm Sata III with 60gb Ssd Intel Smart Response
@ 1920x1080 60hz