3dmk6 is cpu biased, and not really reflective of the quadfire power you have there. From what Ive surfed with a 3.6 overclock quads reporting low 20s, but in real world gaming what you have is basically the best in the world
http://forums.guru3d.com/showthread....79987&page=149
Toasty though eh? Even the 4870 idle at 80s deg C with the low fan speed they have default. I use modded profile to keep idle to ~38% and 54deg C when just surfing, and then run that gainward auto tool when gaming or rest of time (the min is 50% speed and there is a marked volume difference)
Have fun, thats one heck of a system you have there Dave!