But the E7500 would go 3.6 Ghz on a locked down office computer with a tapemod. If you're stuck at 65nm 266fsb the 65W 2 core X6800 is unlocked also. B3 stepping holds it back some but they can be found cheap. Just about any of the old Dell BTX Optiplexes can be overclocked one way or the other with these. The old P4 heatpipe coolers D9729 are more than enough for this. If anybody wants to do this the Zotac GTX1050 Mini fits and runs off of the Optiplex PSU in the MT size computers. If you're in the US and you can't find one of these computers for $20 you're not trying hard enough. Opti 745 8GB DDR2 800 (130W 65nm 266fsb unlocked CPUs for OC), Opti 755 8GB DDDR2 333fsb 95W CPU,Opti 760 UEFI, 16GB DDR3 333fsb95W CPU. No LGA771 Xeons, and pinmod for OC, But Q6600 3Ghz pimod is slower than 95W Q9650 3GHz by 10%.
Optiplex 380 333fsb,8GB DDR3 1066, Xeon X5470. Needs BIOS mod for LGA771.
There were some 9xx Optis. They added some PS2 ports that may block the GPU some, and RAID 0 inthe BIOS
Best BTX Dell is the T3400 workstation. X38 chipset has hidden 400fsb support, QX9650 goes 4.15GHz easily 16GB DDR2 1066 (if you can find any) Dual full size GPU support, RAID 0 BIOS and a stock PSU that can support a 150W GPU (GTX1070?). T9303 is the cooler for those. You need an unlocked CPU to get Voltage control on these for an OC.
There is an XPS BTX cooler that requires some bodging to fit. TJ258. 8mm heatpipes instead of 6mm. Trimming the 2nd FDD bay helps. There's a lump on the cooler shroud that has to go also.
The T3400 375W PSU drops right into the Opti MT and then an MSI GTX1060 Mini can fit (3GB for 8GB systems) with the bracket cut down to 1 slot and some plastic trimming.
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Notice no ports on the 2nd slot, and the plastic is longer than the card.
Once you get away from the top end C2X CPUs they don't cost that much. $20-$30. QX6850 is a G0 stepping CPU. Sort of an unlocked, AND pinmodded Q6600 G0.
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A SLACP QX6800, or SLAWN QX9650 will cost more than twice that.