Yeah, 266 is right. I think the 7DX+ might support the 2100 up to it's 266, but I'm not sure.
I have a Volcano 9+ cooler, and if you have it too, you'll notice how flimsy the wiring is connecting the fan to the speed controller. I don't know when it happened, but one of the wires was severed, and (I didn't notice until too late) the CPU fan wasn't powered, while the computer was on. So after that, my computer can boot up, but cannot load Windows...
But instead of getting that, I've decided to go for the Athlon 64 now, and get a new Mobo. I think I'm going to get the Shuttle XPC.