The memory arrived and I installed it and the system wouldn't boot with the new memory or when it was installed alone. Each time I had to clear the RTC ram to go back to the original memory alone. Nothing I did would let the system run with the new memory or with the new memory alone. The manual doesn't show as compatible the A-Data 1GB RAM. It shows 512MB and 256MB A-Data RAM as compatible. I guess the memory goes back. Definitely not a bargain at any price.