I don't know about the temps for the 3800's, but 70 is not overly hot for my X1950XT. The 3800's run a lot cooler than the 19xx's, so the top temp may be lower.
If you're worried about the temps, drop the OC a little. you defintiely don't need to OC it to play WOW, even if it is maxed out. The 3870 is powerful as is.
If you're worried about the temps, drop the OC a little. you defintiely don't need to OC it to play WOW, even if it is maxed out. The 3870 is powerful as is.