VAIO SZ + 4G RAM => BIOS? Vista x86? Vista x64? 有圖有真相?

最近幫VAIO SZ-38TP加了 2x2G RAM. BIOS只顯示3G

Vista 32 bit => 3G


Vista 32 bit Task Manager => 3G


Vista 32 bit Vaio Control Center => 4G


Vista 32 bit SP1 => 4G


Vista 32 bit SP1 Task Manager => 3G? 細節請自行比較


Vista 32 bit SP1 Vaio Control Center => 4G


Vista 64 bit => 3G


Vista 64 bit Task Manager => 3G


Vista 64 bit SP1 => 4G


Vista 64 bit SP1 Task Manager =>3G?


Task Manager的內容判讀不是很有把握. 請自行判讀.
不是很確定的結論:
1. SP1之前 無論是 32 bit 或 64 bit, (除了 Vaio Control Center 顯示4G 外) 應該只有3G
2. SP1後, 無論是 32 bit 或 64 bit, 雖然顯示 4G, 但可能只有3G可用?
請高手賜教. 謝謝.