The CPU in question is the Pentium Extreme Edition 955.

Intel's website shows four "versions", but for the most part they all look identical. They even share the same set of ordering codes.

But one of them has a substantially lower TDP, which is seemingly unexplainable - since everything else is the same. Two of them say "LGA775, Tray" and I have no idea what "Tray" means either. Also, two of them have a different SPEC code.

What I need to know is:

What does "LGA775, Tray" mean?

Why does the one CPU have a lower TDP? And what does that mean for me? Does that mean lower maximum power consumption? Does it mean the CPU may be more stable/endurant, because of a lower heat output?

Why do two of them have a different SPEC code, and what does this mean?

Finally, what does PLGA775 (as opposed to LGA775) mean, and do I need to be worried about that?

***Information from Intel's wbsite:***  

[Intel® Pentium® Processor Extreme Edition 955 (4M Cache, 3.46 GHz, 1066 MHz FSB) with SPEC Code](http://ark.intel.com/Product.aspx?id=27614)

1
=

Boxed Intel® Pentium® Processor Extreme Edition 955  

4M Cache, 3.46 GHz, 1066 MHz FSB  

LGA775  

PLGA775  

B1  

95 Watts  

BX80553955  

SL94N

2
=

Intel® Pentium® Processor Extreme Edition 955  

4M Cache, 3.46 GHz, 1066 MHz FSB  

LGA775, Tray  

PLGA775  

B1  

130 Watts  

HH80553PH0994M  

SL94N

3
=

Boxed Intel® Pentium® Processor Extreme Edition 955  

4M Cache, 3.46 GHz, 1066 MHz FSB  

LGA775  

PLGA775  

B1  

130 Watts  

BX80553955  

SL8WM

4
=

Intel® Pentium® Processor Extreme Edition 955  

4M Cache, 3.46 GHz, 1066 MHz FSB  

LGA775, Tray  

PLGA775  

B1  

130 Watts  

HH80553PH0994M  

SL8WM