82845G/GL/GE/PE/GV Graphics Controller
I would need more info than that like brand etc. but even than its impossible to tell really. As for Low and High End, i simply advise people to download the High End, and see if they work for you, if yes thats cool, if not, than try the Low End versions.
I pretty much asume that the threshold is on the 128 mb videocard, which is what i also have. Mostly it works fine, but on some maps that have alot of different (S3TC) textures it drops in framerate.
But it also depends on how powerfull your computer is as far as CPU, memory, type of HD and more important the number of harddrives sitting in your comp. Having seperate drives for swapfiles dramatically improoves performance on any system.
As i also mentioned, the High/Low end specs are only guidelines and nothing more. Its kinda try and error really. In addition to all that i didnt take in account what renderer is being used, OpenGL or D3D9, that too can make a difference.
And since there is no way for me to test it, i simply advise downloading the High End and see if that works

And hopefully it does

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