Ebay might be a upgrade method, older motherboard and cpu combos are inexpensive. Used is always a question as sometimes they are very used, but seller ratings can be a guide to avoid a non working motherboard and cpu combos upgrade.
Sometimes they are fully populated with memory, video cards and fans... I have had good luck on most of my used ebay purchases...
$50 with shipping - https://www.ebay.com/itm/Asus-P5KPL-CM- ... 3218053388?
New is always better, but much more expensive...
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