My Computer is below
Overview - ThinkCentre A61 (type 9120)
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Features and specifications
Processor Small Desktop (4x4) with AMD 690G chipset
AMD Sempron™ 1.66GHz to 2.2GHz , 128KB to 256KB, Socket AM2 processor
AMD Athlon8482; 64 3500+, 2.4GHz, 512KB, Socket AM2 processor
AMD Athlon8482; 64 3800+, 2.4GHz, 512KB, Socket AM2 processor
AMD Athlon8482; 64 X2 Dual-Core 2.0GHz to 2.6GHz , Socket AM2 processor
Memory 256MB, 512MB, 1GB, or 2GB of non-parity DDR2 SDRAM
supports up to 8.0GB maximum memory
Hard drive 80GB 7200RPM S-ATA
160GB 7200RPM S-ATA
250GB 7200RPM S-ATA
320GB 7200RPM S-ATA
500GB 7200RPM S-ATA
Graphics Integrated Video AMD 690G
Nvidia GeForce 7300LE 128MB 64BIT with DMS59
ATI Radeon X1300 256MB 64BIT with DMS59
CD and DVD drive 48x CD-ROM
16x DVD-ROM
48x32x48x16x CD-RW/DVD combo
DVD Recordable
Networking Integrated Marvell Gigabit Ethernet
Operating System Microsoft Windows XP
Microsoft Windows Vista Home Basic
Microsoft Windows Vista Home Premium
Microsoft Windows Vista Business 32
DOS License
ThinkVantage Technologies ThinkVantage Technologies help make your system more secure, manage networks and connectivity, backup and restore your data, and more.
Detailed specifcations All specifications for the ThinkCentre A61 (type 9120)
Note: Specifications are dependent on the machine type and model
http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-70083
I bought the following two RAMs from newegg.com
A-DATA 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16820211188
CORSAIR 2GB 240-Pin DDR2 SDRAM DDR2 667 (PC2 5300) Desktop Memory - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145180
I bought both A-DATA 4GB and CORSAIR 2GB from newegg.com, but computer shows 3.25 GB of RAM Physical Address Extension. Does that mean computer recognized the 6 GB of additional RAM? When I removed the A-DATA 4GB RAM, computer only shows 3.0 GB of RAM, but didnt show Physical Address Extension. So does that mean my A-DATA 4GB RAM only functioned as 0.25 GB of RAM?
Please help me figure this out, thank you very much