It has 512MB of GDDR3 memory unless I'm reading this specs sheet wrong. And it has 767MB reserved from main RAM if needed(Total 3GB).
I've played Medieval II: Total War, EVE Online Premium and Supreme Commander also with this and they run nicely enough for me. And I haven't had any crashes or other anomalies so far.
I've actually had a nice heated "nerdrage" (No offense meant) discussions about the TurboCache causing performance loss because it's hijacking system memory. But from my own experience I won't sign that argument. Perhaps with laptops that have 1GB or 2GB RAM that argument might be plausible but when you have 3GB or more RAM I really have hard time even in believing that.
Oh and I dont play 3DMark. I find it a rather boring game.
Bloody hell the cat puked on the carpet AGAIN... *sigh*