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I just got a Mac pro mid 2010 8 core (2 x5620) from eBay. My question is , I want to put new thermal paste on the CPU, it’s a good idea to buy the upgraded CPU for 12 core? 5680 or 5670? There will be a big difference? Or to stay with the 5620 8 core?

You bought this one: Apple Mac Pro “Eight Core” 2.4 (2010/Westmere) Specs Identifiers: Mid-2010 - MC561LL/A - MacPro5,1 - A1289 -  2314-2* https://everymac.com/systems/apple/mac_p… Geekbench 2 (32):12788 Geekbench 2 (64):14136 You are looking at this one: Apple Mac Pro “Twelve Core” 2.93 (2010/Westmere) Specs Identifiers: Mid-2010 - BTO/CTO - MacPro5,1 - A1289 -  2314-2* Geekbench 2 (32):21754 Geekbench 2 (64):24262 Cost: $190 Geekbench 2 (32):21754 Geekbench 2 (64):24262 You could go to the X5690 for $290 https://www.ebay.com/itm/12-Core-2010-20