North bridge: ATI RC415MD (Xpress 200M)
South Bridge: ATI SB460
CPU Socket: uPGA479m (a version that support Socket M)
Original CPU: Intel Celeron M 530 1.73Ghz/1MB Level 2 cache/533MHz FSB/socket M (socket 478)
Original RAM: DDRII 667 512MB
Upgraded CPU: Core 2 Duo-T7200 2Ghz/2x2MB Level 2 cache/667MHz FSB/socket M (socket 478)
Upgraded RAM: Kingston DDRII 800 2GBx2.
RAM is hardware locked at 533MHz single channel even overclocking the CPU FSB by Clockgen.
Windows 8 64bit task manager report about 2.7 GB ram available for use. 3.5GB detected.
768MB(512 reserved for UNKNOWN reason+256MB video reserved)hardware reserved
4GB-512-768=about 2.7GB available
CPUZ can check all 4GB ram
If 2GB+1GB ram is installed, Windows 8 64bit task manager report about 1.7GB ram available for use & 2.5GB is detected.
512MB missing in task manager.
768MB(256 MB ram reserved for video+512 MB reserved for UNKNOWN reason) reserved.
3GB-512MB-768MB=about 1.7GB available.
So it is still missing 1GB in Windows 8 64bit task manager although CPUZ can check all 3GB ram.
Therefore, installing 4GB is still better.
I have replaced the old notebook malfunctioned motherboard, which made me can not turn it on, & upgraded it according to some threads rather hard to be found out in the internet. BenQ claims that only support 2GB RAM, but I have upgraded to 3GB. And I have proved that the RC415MC can support 667MHz FSB CPU instead of 533MHz. I did not buy T7600 2.33Ghz because of the cost but someone has proved it works with ATI RC415MD north bridge.
Edited by johnliu - 1/3/14 at 7:24pm