Hello. We are a family owned computer upgrade company located in Tacoma WA. We also are CompTia certified PC techs so you can count on your PC or PC part getting lots of attention , tested, and cleaned (if necessary). We take pride in the computer or component you get and also the reasonable price you pay . This is the fastest CPU upgrade kit for the 2009 Apple Mac Pro 4,1 and 5.1. This kit comes with everything you will need to turn your Mac Pro 4,1 or 5.1 into a Twelve Core 3.46GHz system. You will also be able to use the new OS X Sierra when released in the fall with this upgrade. Includes: These X5690 CPUs and the X5680 CPUs will also allow the use of faster 1333MHz memory. The X5670 and slower CPUs will not allow the faster memory.If you have the 2009 version of the Mac Pro and have not upgraded to the 5.1 firmware yet, you will need to download and install the 4.1 to 5.1 firmware before installing these CPUs. It's very east to do and just ask and I'll send you the links for the download and a firmware installation video. ________________________________________________________________ Warranty and other info: We give a one month warranty (upon shipping arrival) on all of our items which is long enough to have it installed and know that it is working perfectly. If for some reason the product becomes faulty after this date, we will still work with you on a solution. Friendly Computers USA can not be responsible for any damages or other losses caused by the use of, or installation of the product. It is also the buyers responsibility to do any research (if needed) to insure a smooth hardware installation. U.S. and International Customers: Once payment is received, your item will be shipped via USPS. Just enter your shipping info into the shipping calculator. Thanks!!