Please help. I recently installed an additional 512Mb of ram to my pc. I had 2 x 512Mb installed previously. in slots 1 & 2 and installed the new ram in slot 3. The pc still only says that there is 1024 of ram installed, although when i run pc wizzard it shows all 3 sicks of ram and gives the details of the ram as well. i have tried fitting a single ram in each of the slots 1, 2 & 3 and re-booted each time and carried this out on all sticks, prooving the ram and slots are ok. I then tried a combination of 2 sticks, with a stick in slot 1 & 2 the systems shows 1024Mb, with a stick in slot 1 & 3 the system shows 1024Mb but with a stick in slot 2 & 3 the system shows 512Mb.
The spec on the motherboard says that it can handle up to 3Gb of ram. I am hoping that this is a case of updating software / drivers etc. to allow the system to recognize all of the ram, but not sure how to proceed, and would appriciate any help you can offer.

The system details are as follows:

MAINBOARD

General Information :
Manufacturer : First International Computer, Inc.
Product : VC15
Version : 1.X
Serial Number : Serial number xxxxxx
Support MP : No

Chassis Information :
Manufacturer : Manufactory Name
Type : Desktop
Version : Version xx
Serial Number : Serial Number xxxxxx
Asset : Asset Tag Number xxxxxx

Sensor Information :
Monitoring Chip : SMSC LPC47M192

Slots Information :
Slot PCI : Available (32-bit) 5.0v
Slot PCI : In Use (32-bit) 5.0v
Slot PCI : Available (32-bit) 5.0v
Slot PCI : In Use (32-bit) 5.0v
Slot PCI : In Use (32-bit) 5.0v
Slot PCI : In Use (32-bit) 5.0v
Slot AGP : In Use (32-bit) 5.0v

External Connectors :
Serial 16450 Compatible : DB-9 male
Serial 16450 Compatible : DB-9 male
Parallel ECP/EPP : DB25 female
Keyboard : PS/2
Mouse : PS/2

Internal Connectors :
PRIMARY IDE : On Board IDE
SECONDARY IDE : On Board IDE
FDD : On Board Floppy
COM1 : 9 Pin Dual Inline (pin 10 cut)
COM2 : 9 Pin Dual Inline (pin 10 cut)
LPT1 : DB25 female
Keyboard :
PS/2 Mouse : PS/2
USB :
USB :


BIOS

General Information :
Manufacturer : Award Software International, Inc.
Version : 6.00 PG
Date : 20 February 2002
Address : 0xE000 on 256 KB
Copyright : Copyright (C) 1984-2001, Award Software, Inc.
Motherboard ID : 02/20/2002-i845-LPC47M19-6A69VF0AC-00
OEM Signature : Version IEF43
DMI Version : 2.3

Characteristics :
Flashable : Yes
Socketed : Yes

Functionnality :
APM : Yes
ACPI : Yes
ESCD : Yes
PnP : Yes
PCI : Yes
ISA : Yes
AGP : Yes
USB : Yes
PCMCIA : No
Smart Battery : No

Boot Information :
Selectable Boot : Yes
CD-ROM Boot : Yes
PC Card (PCMCIA) Boot : No
I20 Boot : No
LS-120 Boot : Yes
1394 Boot : No
ATAPI ZIP Boot : Yes
Network Boot : Yes


CHIPSET

General Information :
NorthBridge : Intel i845D
SouthBridge : 82801BA (ICH2) LPC Interface Controller

NorthBridge Information :
Architecture : HUB
Manufacturer : Intel (First International Computer Inc)
Codename : Brookdale
Revision : B0
Bus Speed : 99.8 MHz
FSB Frequency : 399.3 MHz (QDR)
FSB max. Support : 400 MHz
RAM max. Support : DDR (266 MHz)

Memory Information :
Type : DDR-SDRAM PC2100
Frequency : 133.1 MHz
DRAM/FSB Ratio : 4/3
Activated Channels : Single
ECC Diagnostic : No
CAS Latency (tCL) : 2.5 clocks
RAS to CAS (tRCD) : 3 clocks
RAS Precharge (tRP) : 3 clocks
Cycle Time (tRAS) : 6 clocks
Shared Memory (video) : Yes

Bus Information :
Version : 2.0
Transfert Rate supported : 1x, 2x, 4x
Transfert Rate : 4x
Aperture Size : 128 MB
Side Band supported : Yes
Side Band enabled : Yes
AGP enabled : Yes

APIC Information :
Version : 2.00
Maximum Interrupts : 24
IRQ Handler enabled : Yes

Hub Interface Information :
Version : 1.00
Time Slice : 0
Width : 8-bit
Full Duplex : Yes
Frequency : 4x (264 MHz)
Multiplier : 1/1x

Device Capabilities (PCI) :
I/O Access : No
Memory Access : Yes
Bus Master Capable : Yes
Special Cycle Recognition : No
Memory Write & Invalidate : No
VGA Palette Snoop : No
Parity Error Response : No
Cycle Wait : No
System Error Line : No
Fast Back-to-Back : No
Detects Parity Errors : No
User Defined Format : No
PCI 66Mhz Bus Support : No
New Capability List : Yes
PCI Support : Vendor-Dependant
PCI Support : AGP


RAM

General Information :
A0 (RAS 1) : 512 (Single Bank)
A1 (RAS 2) : 512 (Single Bank)
A2 : Empty

Information SPD EEPROM (A0) :
Manufacturer : Samsung
Part Number : M3 68L6423DTL-CB0
Serial Number : 4F0A050D
Type : DDR-SDRAM PC-2100 (133 MHz) - [DDR-266]
Size : 512 MB (2 rows, 4 banks)
Module Buffered : No
Module Registered : No
Module EPP : No
Width : 64-bit
Error Correction Capability : No
Max. Burst Length : 8
Refresh : Reduced (.5x)7.8 µs, Self Refresh
Voltage : SSTL 2.5v
Prefetch Buffer : 2-bit
Manufacture : Week 73 of 2002
Supported Frequencies : 100 MHz, 133 MHz
CAS Latency (tCL) : 2 clocks @100 MHz, 2.5 clocks @133 MHz
RAS to CAS (tRCD) : 2 clocks @100 MHz, 3 clocks @133 MHz
RAS Precharge (tRP) : 2 clocks @100 MHz, 3 clocks @133 MHz
Cycle Time (tRAS) : 5 clocks @100 MHz, 6 clocks @133 MHz

Information SPD EEPROM (A1) :
Manufacturer : Nanya Technology
Part Number : M2U51264DS8HA0G-75
Serial Number : Unspecified
Type : DDR-SDRAM PC-2100 (133 MHz) - [DDR-266]
Size : 512 MB (2 rows, 4 banks)
Module Buffered : No
Module Registered : No
Module EPP : No
Width : 64-bit
Error Correction Capability : No
Max. Burst Length : 8
Refresh : Reduced (.5x)7.8 µs, Self Refresh
Voltage : SSTL 2.5v
Prefetch Buffer : 2-bit
Manufacture : Week 21 of 2002
Supported Frequencies : 100 MHz, 133 MHz
CAS Latency (tCL) : 2 clocks @100 MHz, 2.5 clocks @133 MHz
RAS to CAS (tRCD) : 2 clocks @100 MHz, 3 clocks @133 MHz
RAS Precharge (tRP) : 2 clocks @100 MHz, 3 clocks @133 MHz
Cycle Time (tRAS) : 5 clocks @100 MHz, 6 clocks @133 MHz

Information SPD EEPROM (A2) :
Manufacturer : Nanya Technology
Part Number : M2U51264DS8HA0G-75
Serial Number : Unspecified
Type : DDR-SDRAM PC-2100 (133 MHz) - [DDR-266]
Size : 512 MB (2 rows, 4 banks)
Module Buffered : No
Module Registered : No
Module EPP : No
Width : 64-bit
Error Correction Capability : No
Max. Burst Length : 8
Refresh : Reduced (.5x)7.8 µs, Self Refresh
Voltage : SSTL 2.5v
Prefetch Buffer : 2-bit
Manufacture : Week 21 of 2002
Supported Frequencies : 100 MHz, 133 MHz
CAS Latency (tCL) : 2 clocks @100 MHz, 2.5 clocks @133 MHz
RAS to CAS (tRCD) : 2 clocks @100 MHz, 3 clocks @133 MHz
RAS Precharge (tRP) : 2 clocks @100 MHz, 3 clocks @133 MHz
Cycle Time (tRAS) : 5 clocks @100 MHz, 6 clocks @133 MHz

Memory Controller Information :
Memory Controller : ECC, SDRAM
Number of connectors : 3
Max. Module Size : 1024 MB
Max. Memory Size : 3072 MB
Supported Speed : Unspecified
Supported Voltages : 5v
Error Detection Method : 8-bit Parity
Error Correction Capability : Unspecified
Current/Supported Interleave : 1-way/1-way

Sorry, forgot to add the processor details

General Information :
Type : Intel Pentium 4
Internal Specification : Intel(R) Pentium(R) 4 CPU 2.20GHz
Codename : Northwood
Revision : B0
Technology : 0.13µ
CPU ID : F.2.4
CPU IDEx : F.2.4
Brand ID : 9
Microcode : MU0F241E

Features :
VME - Virtual Mode Ext. : Yes
DE - Debugging Extension : Yes
PSE - Page Size Extension : Yes
TSC - Time Stamp Counter : Yes
MSR - Model Specific Registers : Yes
PAE - Physical Address Extension : Yes
MCE - Machine Check Exception : Yes
APIC - Local APIC Built-in : Yes
SEP - Fast System Call : Yes
MTRR - Memory Type Range Reg. : Yes
PGE - Page Global Enable : Yes
MCA - Machine Check Architecture : Yes
PAT - Page Attribute Table : Yes
PSE36 - 36-bit Page Size Extension : Yes
PSN - Unique Serial Number : No
DS - Debug Trace & EMON Store : Yes
ACPI - Software Clock Control : Yes
SS - Self Snoop : Yes
TM - Thermal Monitor : Yes
HTT - Hyper-Threading : Yes
SBF - Signal Break on FERR : No
MON - Monitor/Mwait : No
DSCPL - CPL qualified Debug Store : No
TM2 - Thermal Monitor 2 : No
CID - Context ID : No
EST - Enhanced SpeedStep Tec... No
XD - No-execute Page : No
VT - Vanderpool Technology : No
LT - LaGrande Technology : No

Miscellaneous :
FPU - Co-processor Built-in : Yes
CX8 - CMPXCHG8B : Yes
CX16 - CMPXCHG16B : No
CMOV - Conditionnal Move Inst. : Yes
CLF - Cache Line Flush : Yes
FXSR - Fast Float Save & Restore : Yes
xTPR - Send Task Priority : No
DCA - Direct Cache Access : No
DAZ - Denormals Are Zero : Yes
MMX Technology : Yes
SSE Technology : Yes
SSE2 Technology : Yes
SSE3 Technology : No
S-SSE3 : No
EM64T Technology : No
IA-64 Technology : No
PBE - Pend. Brk. EN. : No
LAHF - LAHF/SAHF Inst. : No

Features Hyper-Threading :
Technology Enabled : No

Advanced Settings :
In Order Queue Depth : 12
Fast-Strings : Yes
x87 FPU Opcode : No
Thermal Monitor : Yes
Split-Lock : Yes
Performance Monitoring : Yes
Prefetch Queue : Yes
Branch Trace Storage : Yes
C1E - Enhanced Halt State : No

Mainboard Upgradebility :
Socket/Slot : SLOT 1
Upgrade interface : ZIF Socket
Supported Speed : 2400 MHz (or more)
Supported Voltage : 1.5V

how do i check the ram detected

Ram

The ram detected by the system is 1024Mb, 2 sticks. the ram detected by pc wizzard is 1536Mb 3 sticks. as in the detailed report above.
The ram specification is identical in all 3 sticks as detailed above.
The new ram on its own is detected with no problems.

with all 3 sticks installed is shows 1024.

It says that A2 is empty, but the pc wizzard goes on to show the details of all 3 sticks


Information SPD EEPROM (A0)
Manufacturer : Samsung
Part Number : M3 68L6423DTL-CB0
Serial Number : 4F0A050D
Type : DDR-SDRAM PC-2100 (133 MHz) - [DDR-266]
Size : 512 MB (2 rows, 4 banks)
Module Buffered : No
Module Registered : No
Module EPP : No
Width : 64-bit
Error Correction Capability : No
Max. Burst Length : 8
Refresh : Reduced (.5x)7.8 µs, Self Refresh
Voltage : SSTL 2.5v
Prefetch Buffer : 2-bit
Manufacture : Week 73 of 2002
Supported Frequencies : 100 MHz, 133 MHz
CAS Latency (tCL) : 2 clocks @100 MHz, 2.5 clocks @133 MHz
RAS to CAS (tRCD) : 2 clocks @100 MHz, 3 clocks @133 MHz
RAS Precharge (tRP) : 2 clocks @100 MHz, 3 clocks @133 MHz
Cycle Time (tRAS) : 5 clocks @100 MHz, 6 clocks @133 MHz


Information SPD EEPROM (A1) :
Manufacturer : Nanya Technology
Part Number : M2U51264DS8HA0G-75
Serial Number : Unspecified
Type : DDR-SDRAM PC-2100 (133 MHz) - [DDR-266]
Size : 512 MB (2 rows, 4 banks)
Module Buffered : No
Module Registered : No
Module EPP : No
Width : 64-bit
Error Correction Capability : No
Max. Burst Length : 8
Refresh : Reduced (.5x)7.8 µs, Self Refresh
Voltage : SSTL 2.5v
Prefetch Buffer : 2-bit
Manufacture : Week 21 of 2002
Supported Frequencies : 100 MHz, 133 MHz
CAS Latency (tCL) : 2 clocks @100 MHz, 2.5 clocks @133 MHz
RAS to CAS (tRCD) : 2 clocks @100 MHz, 3 clocks @133 MHz
RAS Precharge (tRP) : 2 clocks @100 MHz, 3 clocks @133 MHz
Cycle Time (tRAS) : 5 clocks @100 MHz, 6 clocks @133 MHz


Information SPD EEPROM (A2) :
Manufacturer : Nanya Technology
Part Number : M2U51264DS8HA0G-75
Serial Number : Unspecified
Type : DDR-SDRAM PC-2100 (133 MHz) - [DDR-266]
Size : 512 MB (2 rows, 4 banks)
Module Buffered : No
Module Registered : No
Module EPP : No
Width : 64-bit
Error Correction Capability : No
Max. Burst Length : 8
Refresh : Reduced (.5x)7.8 µs, Self Refresh
Voltage : SSTL 2.5v
Prefetch Buffer : 2-bit
Manufacture : Week 21 of 2002
Supported Frequencies : 100 MHz, 133 MHz
CAS Latency (tCL) : 2 clocks @100 MHz, 2.5 clocks @133 MHz
RAS to CAS (tRCD) : 2 clocks @100 MHz, 3 clocks @133 MHz
RAS Precharge (tRP) : 2 clocks @100 MHz, 3 clocks @133 MHz
Cycle Time (tRAS) : 5 clocks @100 MHz, 6 clocks @133 MHz

BIOS shows 1024
Sorry, "it" is the report from pc wizzard that says A2 is empty but then shows the details for the ram that is acually in A2

yes,i have checked each module seperately in A0, A1 and A2 and they all work fine.

read: http://www.techspot.com/vb/topic65114.html