Dell Optiplex 755 and 360 or 380 compatibility & differences?

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Tisesme

Commendable
Jan 12, 2017
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*DISCLAIMER: I'm doing this project for fun, this is not my main rig, I'm just playing around.

I have a Dell Optiplex 755 MT(Mini-Tower(Biggest one)) and I bought an Intel Xeon E5472 to preform a LGA 771 to 775 mod and later read somewhere that it wasn't compatible with my motherboard. On that same data table which showed the compatibility with certain motherboards and I saw the 360 & 380 were compatible with the Xeon I got, and I looked up the boards and they look pretty much the same as the 755. So ultimately my question is as follows: Will the 360 and or 380 boards fit and work in the 755 case with all the parts that were in my 755? And what are the differences between the boards? I am aware that the 380 uses DDR3 but it also has an LGA 775 socket. Would THAT board be compatible with the parts in the 755? I'm leaning towards the 360 since it uses DDR2 that I already have and it's only $10 and the 380, while an upgrade of some kind, is $15 plus 8gb DDR3 on eBay is like $12-15

I appreciate all replies, thank you!
 
Solution
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One difference between older 755, and newer DDR3 boards is the addition of an ambiant temperature sensor on the front IO board. The cables are pinned different (blank pin moved) for this. You will need the I/O panel and cables, or get the pinout and spoof the signal with a resistor somewhere. LGA775 Xeons sometimes work, but not actual 771s.
DDR2 800 is just as fast as DDR31066 due to lower latency. Memory speed produces very little increase in performance with modern 2GB GPUs. It basically no longer part of the circuit.
The rear I/O panel is part of the case, any change there will require metal work. All of the Opti's with 1333fsb will have a 95W cpu limit. Get the best LGA775 95W Xeon and don't sweat the MB swap. I looked at all...
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william p

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Sep 22, 2010
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One difference between older 755, and newer DDR3 boards is the addition of an ambiant temperature sensor on the front IO board. The cables are pinned different (blank pin moved) for this. You will need the I/O panel and cables, or get the pinout and spoof the signal with a resistor somewhere. LGA775 Xeons sometimes work, but not actual 771s.
DDR2 800 is just as fast as DDR31066 due to lower latency. Memory speed produces very little increase in performance with modern 2GB GPUs. It basically no longer part of the circuit.
The rear I/O panel is part of the case, any change there will require metal work. All of the Opti's with 1333fsb will have a 95W cpu limit. Get the best LGA775 95W Xeon and don't sweat the MB swap. I looked at all kinds of swaps for all kinds of reasons and it turned out my old Dimension E520 was already an overclocking beast. 1066fsb, DDR2 memory and all.
 
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Solution
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william p

Splendid
Sep 22, 2010
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I would suggest getting the whole computer that will do what you want. Researching another computer I found out the Optiplex 755 has the old front IO cable with the temp. sensor added so it has it's own unique pinout. Dells are very bad about parts interchanges, partly because they make so many, and partly because they refuse to document them.
 
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