Yes, you can exchange the tray 2010-2012. Do not use a 2009.
To kick it to the max go with a matched
PAIR of Intel Xeon X5690 3.46GHz SLBVX 6 Core CPU X58 LGA1366 Processors
Beware of ordering these out of China right now - they’ll take your money, not deliver and finally give you your money back two months later. So pay a little more and find ones already in your country.
You will not need to de-lid these unless you are installing on a 2009.
If upgrading the RAM, do it all at once so all the chips are the same,
Wear a seat belt when using this speed demon.