This kit did not work in my Sony Vaio VGC-LT18E all-in-one desktop from 2007-2008.I tried this kit because it was the cheapest I could find with these specs, but ran into the same problem that many of the Mac users have been encountering with the inaccurate clock speed for these chips. This kit is sold as DDR2 PC2-5300 667Mhz, which is the exact type that my Vaio requires, but allegedly PNY no longer produces that type of RAM and simply tries to sell DDR2 PC2-6400 800Mhz chips packaged as PC2-5300, thinking that the computer will just reign back the chips to 667Mhz. This was not the case with my Vaio ("Memory Management" blue screens galore).I ended up purchasing the Kingston ValueRAM 4Gb 667Mhz kit and it worked perfectly in my system.