I guess it's time for a clarification about TS overclocking. It's a byproduct of laptop undervolting. It's 100% dependent on unlocked CPUs. So it's important to discover them. We're all learning as we go.
Unclewebb wrote the Throttlestop program. I've made a hobby of overclocking Dells but mostly LGA775 BTX computers so far, and Susqehannock has been modding the Dell T3500s for a while.
The i7 Extremes are a given. ASFAIK if it boots it will TS overclock. There are no official unlocked Xeons. I suspect that they were relying on the locked BIOS on workstations to prevent overclocking. The unlocked 1366 Xeons all support 3x1333 RAM, the i7s are 3x1066.
The Dell T3500 has become the common ground for this. Cheap, easy to find, almost impossible to overclock otherwise, and capable of producing a worthwhile result.
The bottom line is a Dell T3500, a W3680 Xeon, and an 80mm fan on the CPU cooler, with Throttlestop software can produce a 4.266Ghz 6 core 12 thread computer in about a 1/2 hour.<$150.
The unlocked Nehalem Xeons are little known and a bit of a mystery. Will an overclocked W3570 45nm 4 core improve on the X5687 32nm locked 4 coreCPU?
The question of the W5580 was worth looking into because it would be only the 2nd unlocked SMP processor ever. It looks like it isn't going to work out.
The last time I took photos I got my camera and tripod, set up decent lighting etc. and the files were too big to post here. I need to adjust the heatpipe holes a little and touch up some bare metal in a few spots. But I'll get some pics. up. At OCN I have an album. What's the best way to get photos up in here?