My 1205's run nice up to 2200 either slack ON low volts or tight (CL8) & high volts on my UD5H then depending on timings/volts you can get them prime stable up to 2300 fairly easy. 2300 ~ 2380 they run but I have trouble booting sometimes they fine other times no go. 2380 + single stick runs & boots fine here's a suicide shot just to see what one stick could run..... shame I can't get 2 sticks like this.