#Motherboard DG965SS - CPU upgrade from E6400 to Q9550 - NOT working .. WHY????

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hearty canopy
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Motherboard DG965SS - CPU upgrade from E6400 to Q9550 - NOT working .. WHY????

cerulean kestrel
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That's a very old chipset, LGA775 is a bit like AM4 where the older chipsets and boards don't necessarily work with the newest CPUs.

I can't find a compatibility list for your board, but here's an asus board on the same chipset that doesn't support 45nm Core 2 processors: https://www.asus.com/supportonly/t3-p5g965a/helpdesk_cpu/

And a gigabyte board that's the same (the 45nm chips are listed as 'n/a' rather than having a supporting bios version): https://www.gigabyte.com/Motherboard/GA-965G-DS3-rev-10/support#support-cpu

So best guess, maybe the top processor you can run is a 65nm quad core. The good news is, Q6600s are cheap.

T3-P5G965A - Support
GIGABYTE
GA-965G-DS3 (rev. 1.0) Support | Motherboard - GIGABYTE Global

Lasting Quality from GIGABYTE.GIGABYTE Ultra Durable™ motherboards bring together a unique blend of features and technologies that offer users the absolute ...

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The board might also not support 1333 FSB? I notice the giga board doesn't seem to...