After testing out some driver versions, I noticed some performance regression on payday 2, 5-10fps difference compared to 3445. the performance seems starts to decrease on 3621.
and some graphical glitches too on payday 2. seems to be happening on every driver version.
https://dl.dropboxusercontent.com/u/119591896/pd2_intel/2014-10-09_00002.jpg
https://dl.dropboxusercontent.com/u/119591896/pd2_intel/2014-10-09_00005.jpg