这是在DELL网站上检测到的系统情况，好像是说两个SLOTS都已经被用了？

Memory
Available Memory 11.46 %
Page File Size 1025.5Mb
Available Page File 90.39 %
Virtual Memory 2047.8Mb
Available Virtual Memory 97.96 %
Memory Slot 1 [DIMM_B] 512Mb
Memory Slot 2 [DIMM_A] 512Mb

Processor
Manufacturer Genuine Intel(R) CPU T2500 @ 2.00GHz
Clock Speed 2GHz
L2 Cache Size 2048


You've searched for Inspiron 6400/E1505

Maximum Memory: 2048MB
Number Of Slots: 2; Units Required: 1