IIRC many plants in and/or near Beijing have been halted, thus lowering the pollution quite a bit, but it will get wors as soon as the olympic games end.
Try to copy the folder "abc" of a default Y installation (simply download and unzip it somewhere, no need to unlock this installation too. We just want the folder) into your y22/y24 installation.
This has helped me, but remember to backup first.
You might also want to check other vids of the same channel out, which explains in a quite detailed manner how to install HDD, thermal compond, GFX cards, the lot.
I think you could have got something much better if only you had the patience to ask before ordering...the 8500GT is a mid-low end GFX card, it should move LFS good, but don't expect too much.