The other day, I was troubleshooting my buddies computer parts. I put his 3870x2 into my win8 machine (replaced 5870). When I started it up, win 8 beeped and booped and beeped an booped and presto, it was working like a charm. Amazing, didn't have to touch drivers at all.
As mentioned, I only remove drivers if downgrading them.
#1: FX-6350, Antec Kuhler 920, MSI 970 Gaming, Asus 5870/V2, ASUS Xonar D2X, GSkill (F3-14900cl9d-8gbxl), Antec Truepower New 750, Arc Midi, Win8.1pro x64
#2: MSI A88X-G45, AMD A10-7850K, IGP, Antec900 case, AMD 2x4GB 2133 (R938G2130UK), Antec 750 True, 128GB Sandisk SSD, WD Black 1TB, Win8.1pro x64
#3: Athlon 64 X2 4200+, AGP 1950pro, Audigy 2, Asus A8V-D, 2gig ram, Enermax 465P. Now on Win8.1pro cat 10.2