Good One, Eagle!
Now that you have it upto 2.43 (the easy part) try to squeeze every last MHz you can
.
I guess you could try playing with the CPU settings first i.e increase Multi by 0.5 units and increasing VCore by minimal increments. Do not cross 1.7 V with stock cooling. To answer your Q about the RAM, I don't know for sure but my guess would be yes. I don't really see otherwise because the RAM Clock speed is derived from the CPU Clock.
58 C is a bit high. My max ever temp was 54 C (VCore=1.65,MoBo 28 C)@2.51GHz. Apart from the stock HSF what kind of a cooling system do you have? How many case fans and how are they arranged?
Here is a
very good stability test after you prime.
I primed overnight and next morning after fooling around with other programs,I tried playing Black Hawk Down
without turning prime off and it crashed (no response)!
Although some may argue thats a bit extreme I believe a truly stable system must not crash. On the other hand it may be the quirky XP.
Anyway, good luck and hope you can post screenshots of your Sandra, Super Pi and CPUz results/data.
BTW*That 6800GT Rocks!!!