Basically, from your board pba number D52032-715, it appears that you have a non-refresh board - S5000VSA4DIMM. The non-refresh is not meant to work with 45nm processors.
Usually the refresh board has a letter 'R' at the end of the sku code.
Even upgrading the bios, it wont make it work or may work but you will have an error message in the bios and you will be stuck with an error message in the bios - 19A -Voltage Mismatched.
A non-refresh board is designed to work only with a 65 nm cpu and no bios update will fix this.
Yeah of course, there is a way to get rid of the message (but not fix it) - Go in the Bios
Main >> Post Error Pause >> Disabled but this may invalidate your board and cpu warranty and worst, you may experience a failure at a long run.
So in short, if you want to use a Xeon 54xx family CPU, try to check from the compatibility list if there is any 65 nm technology.
Note: You can check the cpu specs on this website:
Now, here is an additional tips, before changing the CPU, please update the board firmware to the latest version available on the web.
Thank you for the answer. Glad I asked here first before making any upgrade plans