Mac Pro Upgradable from one core to two cores?

If I were to buy a Mac Pro with One 3.33GHz 6-Core Intel Xeon “Westmere” would I be able to get a second One 3.33GHz 6-Core Intel Xeon “Westmere” and put it in later?

From what I could grasp at this forum and general googling, you can totally upgrade the Mac Pro with another processor later. People have done it to 2006, 2008 and 2009 models. Take a look at AnandTech and also www.o0o.it.
It doesn't seem to be an easy procedure, but if you had some experience with computer parts before it would not be a too much of a trouble.
There are two main issues you can face:
1. You need to make sure that your Mac Pro will have two processor slots on the motherboard. I wasn't able to find an exact confirmation of that on the net.
2. You will most definitely have only one heatsink installed, so you will need to buy a second one. Apparently, they are not identical, as in Apple's parts list they are listed as "A" and "B", but I'm not sure about that. Check the www.welovemacs.com they seem to have one on sale. Btw, it also looks like the 2010 model and 2009 models have the identical heatsinks, so you should be able to find it on eBay.
I'm looking at the Mac Pro myself at the moment, and it seems that there is literally no reason to buy more dual-CPU models. Xeons will not cost peanuts in the future, but they will definitely be cheaper than now.

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S
<Edited by Host>

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