Memory upgrade not recognized

[tmc2623]

My computer originally had two 1GB DDR PC3200 memory and two 512MB DDR PC3200 memory. I replaced the two 512MB with 1GB DDR PC3200 memory, but now computer properties only shows 2GB total RAM instead of 4GB. I tried reinstalling the new memory but it does not change.

Summary

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Computer:
Operating System Microsoft Windows XP Home Edition
OS Service Pack Service Pack 3
DirectX 4.09.00.0904 (DirectX 9.0c)
Computer Name TREVOR-01A34656
User Name Trevor Campbell

Motherboard:
CPU Type DualCore AMD Athlon 64 X2, 2418 MHz (12 x 202) 4600+
Motherboard Name Asus A8N-SLI Deluxe (3 PCI, 2 PCI-E x1, 2 PCI-E x16, 4 DDR DIMM, Audio, Dual Gigabit LAN, IEEE-1394)
Motherboard Chipset nVIDIA nForce4 SLI, AMD Hammer
System Memory 2048 MB (PC3200 DDR SDRAM)
BIOS Type Award (11/09/05)
Communication Port Communications Port (COM1)
Communication Port ECP Printer Port (LPT1)

Display:
Video Adapter NVIDIA GeForce 7800 GTX (256 MB)
Video Adapter NVIDIA GeForce 9500 GT (512 MB)
3D Accelerator nVIDIA GeForce 7800 GTX

Multimedia:
Audio Adapter Creative SB0350 Audigy 2 ZS Sound Card

Storage:
IDE Controller NVIDIA nForce4 Parallel ATA Controller
IDE Controller NVIDIA nForce4 Serial ATA Controller
IDE Controller NVIDIA nForce4 Serial ATA Controller
Floppy Drive Floppy disk drive
Disk Drive HDT722525DLA380 (250 GB, 7200 RPM, SATA-II)
Optical Drive LITE-ON CD-RW SOHR-5239V (52x/32x/52x CD-RW)
Optical Drive TSSTcorp CD/DVDW SH-W162C (DVD+R9:5x, DVD-R9:4x, DVD+RW:16x/8x, DVD-RW:16x/6x, DVD-ROM:16x, CD:48x/32x/48x DVD+RW/DVD-RW)
SMART Hard Disks Status OK

Partitions:
C: (NTFS) 238464 MB (224941 MB free)

Input:
Keyboard Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
Mouse HID-compliant mouse

Network:
Network Adapter Marvell Yukon 88E8001/8003/8010 PCI Gigabit Ethernet Controller (192.168.1.101)
Network Adapter NVIDIA nForce Networking Controller - Packet Scheduler Miniport (192.168.1.102)

Peripherals:
Printer Microsoft XPS Document Writer
USB1 Controller nVIDIA MCP04 - OHCI USB Controller
USB2 Controller nVIDIA MCP04 - EHCI USB 2.0 Controller
USB Device USB Human Interface Device

[DaveC2003]

Originally Posted by tmc2623

My computer originally had two 1GB DDR PC3200 memory and two 512MB DDR PC3200 memory. I replaced the two 512MB with 1GB DDR PC3200 memory, but now computer properties only shows 2GB total RAM instead of 4GB. I tried reinstalling the new memory but it does not change.

Two 1GB memory and two 512MB = 3GB

Replaced the two 512MB memory for 1GB, therefore:

Two 1GB memory and the new 1GB memory = 3GB NOT 4GB

The OS uses resources on the PC that would cause the memory usage to be slower than you would expect. Not sure about the 4GB you mentioned, you would need another 1GB if another slot is available.

[gcontos]

I got back into Bios ("son of a gun we'll have some fun on the" Bios) Banged away on keys in response to setup queries wo knowing at all what I was doing. Now XP OS recognizes the new two GB replacement ram.
Muy thanks again, big Dave.
Yrs in suffering brotherhood,
G