Why GFX card with more RAM?

[SEE]

I installed a 2Gb version of the 560Ti and monitored vram usage. Just as a comparison I loaded IL1946 maxed to the hilt on a mission using Cannons Channel map - VRam was around 1.6GB so I knew that the extra VRAM was actually being called on at 1080p native res.

Using the Quick mission 'Bomber Intercept London' with 15 ac and Flak, etc.
I tested Vram using my CloD MP settings which are High except for Buildings/ Land Detail at medium and Trees Off, the max Vram used was around 1GB and FPS very playable even on a 2.7Ghz Duel Core - some stutters as you might expect over London.

Setting Textures to Original and repeating the mission added a bit more Vram use at 1.2GB. I then cranked every setting to the highest available except for SSAO and VRAM went to 1.6GB - at low alt over London the FPS took a severe hit but no suprises there on my system.

I don't particularly see a lot of Visual impact when having some settings such as Buildings and Land detail set to medium other than improved FPS and lower Vram usage. Dropping the resolution to 1600 x 900 and max Vram used was less than 1Gb using my MP video settings as described earlier.

My next upgrade will be the PC Mobo but will wait untill the next patch is out.