其實用得 ddr2 667, 就可以用 ddr2 800, 最好不要混合用, 我提議你轉, 因ddr2 800平到飛起, 好久前我見到Centralfield 買 Star 1G DDR2 800 $140 以有或更平, 轉兩條不是太多錢, 你轉Ram得, 你套 AMD64x2 3600+ 已經好足夠, 至於去到4GB, 因Windows XP 和 Vista 是行32bit, Memory 極限都是3072MB, 64bit Windows 或 2003 Server版無這問題, 不過 64bit 好多軟件用不到, 全部 driver 要寫過, 連打印機在內都不走雞, 這是死証, 所以64bit 不是咁流通之原因.
有時都幾煩, 行4GB Dual Channel 就會無了一部份, 看下面圖就知, 我自己不是打 Game, 我最後決定買 Gigabyte all in one motherboard support 4條 ram slot, 可以行Dual channel, 開機好似下面windows 咁, 得3.25GB, 我底板 shares 3xxMB 去 Intel 顯示卡, 未太浪費.
Windows Problems With 4GB of RAM
The actual amount of system memory (RAM) that the 32-bit versions of Windows operating systems, such as Windows XP and Vista, can support is around 3GB (3072MB) of RAM. This is true even though the computer may be physically capable of supporting more. For example, it's not unusual for a motherboard to provide 4 memory slots that can each contain a 1GB memory module, for a physical maximum of 4GB (4096MB). This amount will be recognized in the BIOS, as can be seen in the picture below.
圖片參考:
http://computermemoryupgrade.mysuperpc.com/bios_4gb_ram_installed.jpg
The actual amount that Windows recognizes at the operating system level varies depending on a number of factors, including the motherboard chipset, BIOS, and devices installed. Some computers may have an actual maximum around 2.75GB, while others may go as high as 3.5GB. The usuable amount of memory is different from the physical amount of memory installed due to "memory mapped IO reservations". This sets aside a significant amount of memory addresses for internal use, reducing the total amount of system memory avaialable to the user.
To see how much system memory is actually available, click on Start, right-click on My Computer, click on Properties in the pop-up menu, and click on the General tab. Here you can see as shown circled in red that 3.25GB of the 4GB of RAM that I have installed is actually recognized at the operating system level.
圖片參考:
http://computermemoryupgrade.mysuperpc.com/windows_4gb_memory_problem_cr.gif