[SOLVED] Why won't my Optiplex 580 mobo recognize my Phenom II x4 840T

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Mar 25, 2020
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I am trying to upgrade my CPU to the AMD Phenom II x4 840T, and from what I can tell it is compatible with the Dell Optiplex 580... but it shows up as an unknown AMD processor, and only runs at 800mHz. Shows up as 800mHz in CPU-Z too, but is at least able to identify what processor it is. Motherboard is flashed to the latest BIOS, A08. Fresh install of Windows, everything else seems fine. Did I miss something and the processor is just incompatible?

I am using an old Dell Precision T3500 case that was gutted, so using the PSU that came with it, 8gb RAM and a 1tb SSD... if any of that matters. Very new at this, thought it would be fun to make a machine out of some spare parts... but it is turning into quite a hassle. Any help would be appreciated!
 
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Mar 25, 2020
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No, BIOS does not ID it. Stock AMD CPU cooler/heatsink combo. Thanks for the reply. Guess I'll still just have a lot of spare parts!
 
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