I just got these both for christmas and built my system.
Lets see, I had it at 244 and stress tested for 8 hours with no problems. I have 1gb corsair xms. Right now I am stress testing (writing this from school) it at 266 fsb, and it was fine when i checked it after 8hours. I'm going to let this go for at least 20 hours to see how it goes. I am on stock cooling, and my temps at 266fsb are 39C idel/~50C load. Hopefully it can hold up because the difference between 1.8 and 2.4 is pretty substantial. The v-core is at 1.55, HHT at 800, and ram voltage at 2.6 (i think). Good luck!