Have built as a replacement against Hynix 2 modules in my Asus G51J a'2GB these RAM modules. So has true plug-and play function! After restarting the modules were directly recognized, albeit loud Everest no manufacturer is defined. However, one should bear in mind that 7 the swap file increases after installation of Windows modules to a whopping 8GB, which of course is no longer space on drive "C" available. Have after thorough research the pagefile custom set to 512 MB and had until now no problems with various programs, even Photoshop CS5 runs without snags. The Windows Experience Index has risen from 7.2 to 7.5 From me a strong buy recommendation. I hope I could help you in your decision a little.