AMD ATI RADEON 4870 1GB GDDR5

Bought a used 4870, I have an svideo to component adapter, and i'm only getting a monochrome output. Using the latest driver available for it on windows 10. If going back to an older OS is going to fix the issue, thats fine, but i'd like to avoid it if possible but prefer to stay on 10. It...

Anything better than the Z87-G43? I would OC to at least 4.2GHz