Hi all, I've recently installed my ATI 5870 card from a 1,1 Mac Pro to a - almost brand new - 5,1 Mac Pro (the one in sign). Everything works well but I often see artifacts on screen (glitches, thin black rows parallel to the lower late of finder's windows, etc etc...). After a two week monitoring: Finder it's the only app that seems affected (games and other apps runs smoothly), artifacts are more frequent the first hour after the boot than I almost have no artifacts at all, some times a log off / log in seems to fix the issue. I have artifacts with - all up to date - 10.7, 10.8 and 10.9 too I had no artifacts at all with the 1,1 MacPro; no artifacts with a GeForce GT 120 installed on the same 5,1 MacPro; actually I have both the 5870 an the GT120 installed on the 5,1 Mac Pro (5870 connected to a 23" Cinema Display, GT120 connected to a Dell U2312HM and I got artifacts. Any idea?