[64 bit] GPU ran out of video memory? (BF2+FEAR2+TF2)

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http://ubuntuforums.org – Dear people, I've just spent my past fifteen hours trying to resolve some video-memory related issue, while at the same time playing Battlefield 2, F.E.A.R. 2 and Team Fortress 2 on Ubuntu_12.04_64-bits with Catalyst_13.3-beta3 under Wine_1.5.26, PlayOnLinux_4.2 and Steam itself, but for some reason F.E.A.R. 2 and at random Battlefield 2 will crash stating that there's not enough video memory, or vram and that "384MB" is not enough? How can this be possible with an +2GB graphics card running without any form of anti-aliasing and everything set to either low or off, while AMD Catalys (Hardware)