Are you running ATI 5870, 6870 or Nvidia 460?

[Former_Older]

Well that's why I ask about the cards

I'm running an ATI Radeon 5700 @ 1 gig, in a system with 8GB Ram and an i7 870

If I run 10.9 or above, I get blocky text. If I run 10.8 I am 100% good

By only changing driver versions, I can get blocky text, or fix the blocky text. I can do this at will, depending on driver version

Since This is the sole change I make, and I can reliably introduce the problem by choosing a driver and reliably get rid of the problem by choosing a driver, the only conclusion is it's driver-dependent, given my hardware

So that's why I'm interested if the info given that 'problems are fixed post 10.8' applies to just the cards the OP states, or what