After recent discussions and having had a few W3680's come into the shop, I decided to bring them home for testing & use.
In both of my T3500's, 4GHZ was achieved stable(ThrottleStop) but not without temps bumping up to levels I wasn't ok with(mid 70'sC). Still, for short term testing, not bad at all. The interesting part was that many of the GFX benchmarks I ran either didn't go up at all or barely moved, yet CPU tests, like Prime95, were faster by a margin one would expect. This tells me that both of those systems are not CPU bottlenecked to any serious degree, which I was surprised by! I thought there would be some CPU bottlenecking going on, but when you jump from 3.46GHZ all core, to 4GHZ all core and there is barely an uptick in scores it leaves me wondering what the deal is.