Custom Built Acer Aspire 3680 Bios Mod Request

[basicchipmunk]

Hi I have a acer aspire 3680 that has been upgraded with 500gb hdd, 4gb ram and motherboard upgrade from acer aspire 5570 to accpect the t7200 cpu which I have installed. My main problem is lack of memory options in bios mainly re-map/mapping I just installed 64 bit windows 7 but it was using all 4gb ram read online this was a bios issue so I reverted back to 32bit win 7. The bios installed is V1.3508 from acers website but as this laptop has a different motherboard now im not sure what bios to use so any info would help I have copied detailed laptop info below and attached a txt file, if you need anything else just ask
Thanks
Shane

Motherboard
Manufacturer Acer, Inc.
Model Prespa1 (U2E1)
Version Not Applicable
Chipset Vendor Intel
Chipset Model i945GM
Chipset Revision 03
Southbridge Vendor Intel
Southbridge Model 82801GHM (ICH7-M/U)
Southbridge Revision B0
System Temperature 77 °C
BIOS
Brand Acer
Version v1.3508
Date
PCI Data
Slot PCI
Slot Type PCI
Slot Usage Unknown
Bus Width 32 bit
Slot Designation PCI Slot J11
Slot Number 0

CPU
Intel Mobile Core 2 Duo T7200
Cores 2
Threads 2
Name Intel Mobile Core 2 Duo T7200
Code Name Merom
Package Socket 479 mPGA
Technology 65nm
Specification Intel Core2 CPU T7200 @ 2.00GHz
Family 6
Extended Family 6
Model F
Extended Model F
Stepping 6
Revision B2
Instructions MMX, SSE, SSE2, SSE3, SSSE3, Intel 64
Virtualization Supported, Disabled
Hyperthreading Not supported
Bus Speed 166.7 MHz
Rated Bus Speed 666.7 MHz
Stock Core Speed 2000 MHz
Stock Bus Speed 166 MHz
Average Temperature 77 °C
Caches
L1 Data Cache Size 2 x 32 KBytes
L1 Instructions Cache Size 2 x 32 KBytes
L2 Unified Cache Size 4096 KBytes
Core 0
Core Speed 2000.1 MHz
Multiplier x 12.0
Bus Speed 166.7 MHz
Rated Bus Speed 666.7 MHz
Temperature 77 °C
Thread 1
APIC ID 0
Core 1
Core Speed 2000.1 MHz
Multiplier x 12.0
Bus Speed 166.7 MHz
Rated Bus Speed 666.7 MHz
Temperature 77 °C
Thread 1
APIC ID 1
RAM
Memory slots
Total memory slots 2
Used memory slots 2
Free memory slots 0
Memory
Type DDR2
Size 4096 MBytes
Channels # Dual
DRAM Frequency 333.3 MHz
CAS# Latency (CL) 5 clocks
RAS# to CAS# Delay (tRCD) 5 clocks
RAS# Precharge (tRP) 5 clocks
Cycle Time (tRAS) 15 clocks
Bank Cycle Time (tRC) 21 clocks
Physical Memory
Memory Usage 46 %
Total Physical 2.99 GB
Available Physical 1.59 GB
Total Virtual 5.98 GB
Available Virtual 4.62 GB
SPD
Number Of SPD Modules 2
Slot #1
Type DDR2
Size 2048 MBytes
Manufacturer Corsair
Max Bandwidth PC2-6400 (400 MHz)
Part Number VS2GSDS800D2
SPD Ext. EPP
JEDEC #2
Frequency 400.0 MHz
CAS# Latency 5.0
RAS# To CAS# 5
RAS# Precharge 5
tRAS 18
tRC 23
Voltage 1.800 V
JEDEC #1
Frequency 266.7 MHz
CAS# Latency 4.0
RAS# To CAS# 4
RAS# Precharge 4
tRAS 12
tRC 16
Voltage 1.800 V
Slot #2
Type DDR2
Size 2048 MBytes
Manufacturer Corsair
Max Bandwidth PC2-6400 (400 MHz)
Part Number VS2GSDS800D2
SPD Ext. EPP
JEDEC #2
Frequency 400.0 MHz
CAS# Latency 5.0
RAS# To CAS# 5
RAS# Precharge 5
tRAS 18
tRC 23
Voltage 1.800 V
JEDEC #1
Frequency 266.7 MHz
CAS# Latency 4.0
RAS# To CAS# 4
RAS# Precharge 4
tRAS 12
tRC 16
Voltage 1.800 V
Graphics
Monitor
Name Generic PnP Monitor on Mobile Intel 945 Express Chipset Family
Current Resolution 1280x800 pixels
Work Resolution 1280x770 pixels
State Enabled, Primary
Monitor Width 1280
Monitor Height 800
Monitor BPP 32 bits per pixel
Monitor Frequency 59 Hz
Device \\.\DISPLAY1\Monitor0
Mobile Intel 945 Express Chipset Family
Device ID 8086-27A2
Revision 4
Subvendor Acer Incorporated [ALI] (1025)
Current Performance Level Level 1
Driver version 8.15.10.1930
Count of performance levels : 1
Level 1
Mobile Intel 945 Express Chipset Family
Device ID 8086-27A6
Revision 4
Subvendor Acer Incorporated [ALI] (1025)
Current Performance Level Level 1
Driver version 8.15.10.1930
Count of performance levels : 1
Level 1
OpenGL
Version 1.4.0 - Build 8.14.10.1930
Vendor Intel
Renderer Intel 945GM
GLU Version 1.2.2.0 Microsoft Corporation
Values
GL Extensions

[basicchipmunk]

Does anybody have any advice on the above problem?
Thanks