Hey you all,

That's maybe a ridiculous problem which happened in windows 8 64 bit Graphics not the 32 bit. In general, windows 8 64 bit works perfect. but my graphics 3D Gaming subscore dropped from a 6.9 to a 2.0 since upgraded to win 8 64 bit. I have an ATI Radeon 4850 with the latest catalyst 9.6, and I cannot understand why going 64 bit would do this.

many thanks for your any help.

Actually, not encountered such kind of problem. Just check your graphic card or send it to the after sale