i bought the 290x 2 days ago and since then I sometimes receive the HT sync error. So the pc is lagging and does a restart. I'm using the catalys 13.11 Beta 8(the only working one with the 290x).
Bequiet 500 watt PSU.
Windows 7 64bit.
The ram is fine, cause I checked it with memtest and also changed it. If I'm using my old GPU(6850) it's also working fine. The PSU is also fine(prime 95 and furmark at the same and no restart). So I hope that its a problem with the beta driver...