Those are fakes that were never originally made by Intel. I wouldn't touch one of those.
Instead I would look for an x3370 or x3380--these were Intel made lga775 xeons that will work as long as your bios will support it, which it seems like it should according to the solution in this thread:
Does anyone know if this is possible? I would like to try putting something like a Xeon X3380 in one, since they are over 3Ghz and are cheaper than equivalent Core 2 Quads. It would be a Minitower.
forums.tomshardware.com
And the x3380 is actually a hair faster too, so it's an upgrade if you can find it:
https://www.cpubenchmark.net/compar...on-X3380-vs-Intel-Xeon-X3370/1050vs1286vs1285
I have an x3360 in one of my Dells because the q95xx was just too expensive for the upgrade and it works great.