Upgraded friend's Acer 5517 laptop from a TF-20. Works great after upgrade with zero issues. Win 7 experience CPU index increased 1.0 point. The part I received looked brand new. Cleaned the old thermal compound off the heat-sink and replaced with compound I had in the cabinet.
Works well in my Acer Aspire 5517. Upgraded from a single core. Easy swap no extra programming needed. The laptop installed the drivers automatically. Disassembly and reassembly of the laptop not for the beginner. Has been working flawlessly since install.