(Sorry for my bad English)
Can I use a Xeon X5690 CPU on the Intel DX58SO2 mainboard? I have installed last BIOS Version 920.
At http://processormatch.intel.com/Processors/CompatibleProcessors?componentName=dx58so2 Compatible Processors site I can only find the W3690. What are the differences W3690 vs. X5690?
This thread is from 2014. That is 8 years ago. You should have started a new thread.
Now, the bad news. The x5690 is not supported by your board's BIOS.
Also, the x5675 is not supported either.
Doc (not an Intel employee or contractor)
[Maybe Windows 12 will be better]