"(2009) MacPro 4,1 Quad-Core 2.66GHz to 3.2GHz Processor Upgrade
Attached zip contains screen prints before and after, successful processor upgrade.
MacPro 2009 4,1 SP Xeon 2.66GHz (W3520) -> Xeon (W3565) 3.2GHz
Bought CPU "used" off of ebay for appx $100. 15 minutes of labor = a little extra "zip"
(Scores taken from screenshots sent. Running OS X 10.9.3 (beta), 16GB ram)

CineBench R15 CPU scores:

• 2.66GHz: 420
• 3:20GHz: 517
  
  GeekBench:
  
• 2.66GHz: 2113 (single core), 8206 (multi-core)
• 3:20GHz: 2349 (single core), 9514 (multi-core)

-Lawrence"

Thanks Lawrence. (Here's a previous article on 2009 Mac Pro (4-core) 2.66GHz to 3.2GHz CPU Upgrade w/Benchmarks. The Macs/mods page has other older Mac Pro low-cost CPU Upgrades (often used/pulls), most from 2008 or earlier Mac Pros. Some Xserves also.)
  

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For links to older news pages, see the Archives.