So far, so good. If you have never installed components like this before, it is not impossible, but replacing a CPU is not as straightforward as popping in a new video card or RAM. Do your homework, research thoroughly, and watch some videos. If you're buying a CPU upgrade, I'm sure you're already familiar with the research and review process, but definitely do your homework on the system you intend to use it with. Also, don't forget to buy some good thermal paste (such as Installed two in a mid-2011 Mac Pro Tower (5,1), which, when combined with a Great upgrade on an older system. Update your BIOS to the latest version prior to installing would be suggested.It works well in my home network server. Its overclocked to. Stable chip.Very happy with this product and Adventis service. Upgraded 2009 Mac Pro. Processor replacement arrived promptly in quality/safe package. Easy to replace. Working great. Was able to add more years to my Mac Pro.Bought a matching pair of Xeon X5690's from StallionTek for a Mac Pro 5,1. Good communications. Delivered Fast. Works great. Can't expect much more than that.Installed this in my 2010 Mac tower as part of an overall upgrade. It’s working great!Installed this into a MAC PRO 5,1 - single CPU board. Getting full 64Gig 1333Mhz memory available now!Installed in a MacPro 2010. The server is now way more powerful for a reasonable price.Not only fast shipping and excellent packaging, but exactly as described.