Question about efficiency

---EDIT---

I rephrased my question into a more understandable form in reply number 3. Sorry for wierd grammar, english is not my first tongue.

---END EDIT---


My pc meets the recommended system requirements for cod4 (system info at very bottom of the page) but even so i have to play it on minimal settings 800x640 resolution with an average fps value of 64, so I did a memory bandwidth test with SiSoftware Sandra and it gave me a "Warning 5400 : Low bandwidth efficiency (advanced). Check memory timings and settings." as well as "Bandwidth Efficiency : 42.26%"
I tried going into the bios to find anything but i dont seem to have that option :S here are the test results:

SiSoftware Sandra

Benchmark Results
Int Buff'd iSSE2 Memory Bandwidth : 3.51GB/s
Float Buff'd iSSE2 Memory Bandwidth : 3.50GB/s
Results Interpretation : Higher index values are better.

Windows Experience Index
Current Chipset/Memory : 4.1
Results Interpretation : Higher index values are better.

Performance vs. Power
Chipset(s)/Memory Power : 3.60W
Int Buff'd iSSE2 Memory Bandwidth : 999.17MB/s/W
Float Buff'd iSSE2 Memory Bandwidth : 996.39MB/s/W
Results Interpretation : Higher index values are better.

Capacity vs Power
Memory Capacity : 569MB/W
Results Interpretation : Higher index values are better.

Int Buff'd iSSE2 Memory Bandwidth
Assignment : 3.52GB/s
Scaling : 3.53GB/s
Addition : 3.51GB/s
Triad : 3.49GB/s
Data Item Size : 16bytes
Buffering Used : Yes
Offset Displacement Used : Yes
Bandwidth Efficiency : 42.26%

Float Buff'd iSSE2 Memory Bandwidth
Assignment : 3.50GB/s
Scaling : 3.53GB/s
Addition : 3.49GB/s
Triad : 3.50GB/s
Data Item Size : 16bytes
Buffering Used : Yes
Offset Displacement Used : Yes
Bandwidth Efficiency : 42.14%

Performance Test Status
Run ID : VIA Standard Host Bridge; 2GB Micron DIMM DDR2 (534MHz) PC2-4300 (4-5-2-12)
Platform Compliance : x86
Total Memory : 2GB
Memory Used by Test : 256.03MB
NUMA Support : No
SMP (Multi-Processor) Benchmark : No
Total Test Threads : 1
Multi-Core Test : Yes
SMT (Multi-Threaded) Benchmark : No
Processor Affinity : P0C0T0
System Timer : 14.32MHz
Page Size : 4kB
Use Large Memory Pages : No

Features
SSE Technology : Yes
SSE2 Technology : Yes
SSE3 Technology : Yes
Supplemental SSE3 Technology : Yes
SSE4.1 Technology : No
SSE4.2 Technology : No
AVX - Advanced Vector eXtensions : No
FMA - Fused Multiply Add eXtensions : No
SSE4A Technology : No
SSE5 Technology : No
HTT - Hyper-Threading Technology : No

Chipset
Model : NEC Standard Host Bridge
Revision : A1
Front Side Bus Speed : 4x 266MHz (1.06GHz)
Width : 64-bit
Maximum Bus Bandwidth : 8.31GB/s

Logical/Chipset Memory Banks
Bank 0 : 1GB DDR2 4-5-2-12 2T
Bank 2 : 1GB DDR2 4-5-2-12 2T
Channels : 1
Bank Interleave : 8-way
Width : 64-bit
Memory Controller in Processor : No

Memory Module(s)
Memory Module : Micron 8HTF12864AY-53EE1 1GB DIMM DDR2 PC2-4300U DDR2-534 (4.0-4-4-12 2-16-4-2)
Memory Module : Micron 8HTF12864AY-53EE1 1GB DIMM DDR2 PC2-4300U DDR2-534 (4.0-4-4-12 2-16-4-2)

Performance Tips
Notice 5008 : To change benchmarks, click Options.
Notice 5004 : Synthetic benchmark. May not tally with 'real-life' performance.
Notice 5006 : Only compare the results with ones obtained using the same version!
Warning 5400 : Low bandwidth efficiency (advanced). Check memory timings and settings.
Warning 5010 : Cannot use Large Memory Pages due to lack of privileges.
Tip 2 : Double-click tip or press Enter while a tip is selected for more information about the tip.


--------------------------------------------------------------------------------------------------------------


After that I did just looked at mainboard info using SiSoftware sandra and i found this:

System Memory Controller
Location : Mainboard
Error Correction Capability : None
Number of Memory Slots : 2
Maximum Installable Memory : 1GB
Bank0/1 - A0 : None None None None DIMM DDR2 1GB
Bank2/3 - A1 : None None None None DIMM DDR2 1GB

What does it mean that Maximum installable memory is 1gb? I bought the PC already with 2 gb, does it mean that one gb is just sitting there being useless? Looking further down the info it said:

Performance Tips
Notice 224 : SMBIOS/DMI information may be inaccurate.
Warning 2507 : Mainboard has too few memory slots. Upgrading the memory may be difficult or expensive.
Warning 2508 : All memory slots are full. Upgrading the memory may be difficult or expensive.
Warning 2541 : FSB exceeds Chipset rated speed. Reduce FSB.
Tip 2546 : Large memory modules should be ECC/Parity.
Tip 2 : Double-click tip or press Enter while a tip is selected for more information about the tip.

So now im thinking whats the real value of ram that i have and if its only 1 gb, is there any way i can fix it? I will upload some screen shots of my bios screen later if there is any need, i would appreciate any answers that you might have regarding the ammount of ram i actually use and if i can enable the other gig that i have installed. Here is the full report form sisoftware sandra:

SiSoftware Sandra

System
Manufacturer : Packard Bell BV
Model : iXtreme X2711
Version : PB81X06201
Serial Number : 100338330357
ID : 28251C00-07200FBB-40182209-00000014

System Chassis
Manufacturer : Packard Bell BV
Type : Desktop
Can be locked : No
Version : OEM
Serial Number : 50424E

Mainboard
Manufacturer : Packard Bell BV
Multi-Processor (MP) Support : No
MPS Version : 1.40
Model : PT890-8237A
Serial Number : 50424E
System BIOS : 11/19/2007-PT890-8237A-6A7L8FKEC-00
Chipset : VIA PT890

System Memory Controller
Location : Mainboard
Error Correction Capability : None
Number of Memory Slots : 2
Maximum Installable Memory : 1GB
Bank0/1 - A0 : None None None None DIMM DDR2 1GB
Bank2/3 - A1 : None None None None DIMM DDR2 1GB

Chipset
Model : NEC Standard Host Bridge
Revision : A1
Bus : Intel AGTL+
Front Side Bus Speed : 4x 266MHz (1.06GHz)
Maximum FSB Speed : 4x 200MHz (800MHz)
Width : 64-bit
I/O Queue Depth : 8 request(s)
Priority Master Queue Depth : 4 request(s)
Maximum Bus Bandwidth : 8.31GB/s

Chipset 1 Hub Interface
Type : V-Link
Version : 7.00
Multiplier : 2x
I/O Queue Depth : 9 request(s)

Logical/Chipset Memory Banks
Bank 0 : 1GB DDR2 4-5-2-12 2T
Bank 2 : 1GB DDR2 4-5-2-12 2T
Supported Memory Types : ECC DDR DDR2
Channels : 1
Bank Interleave : 8-way
Maximum Memory Speed : 2x 333MHz (666MHz)
Width : 64-bit
Memory Controller in Processor : No
Refresh Rate : 21.44µs
Power Save Mode : No
Fixed Hole Present : No

APIC 1
Model : NEC I/O APIC Interrupt Controller
Revision : A1
Version : 0.03
Multiplier : 1/2x
Maximum Interrupts : 24
IRQ Handler Engaged : Yes
Enhanced Support : Yes

Memory Module
Manufacturer : Micron
Model : 8HTF12864AY-53EE1
Serial Number : DD12A65F
Type : 1GB DIMM DDR2
Technology : 8x(128Mx8)
Speed : PC2-4300U DDR2-534
Standard Timings : 4.0-4-4-12 2-16-4-2
Version : 1.02
Date of Manufacture : 24 December 2007
Memory DC Line : 1.80V
Set Timing @ 267MHz : 4.0-4-4-12 2-16-4-2
Set Timing @ 200MHz : 3.0-3-3-9 2-12-3-2

Memory Module
Manufacturer : Micron
Model : 8HTF12864AY-53EE1
Serial Number : DA1417E8
Type : 1GB DIMM DDR2
Technology : 8x(128Mx8)
Speed : PC2-4300U DDR2-534
Standard Timings : 4.0-4-4-12 2-16-4-2
Version : 1.02
Date of Manufacture : 24 December 2007
Memory DC Line : 1.80V
Set Timing @ 267MHz : 4.0-4-4-12 2-16-4-2
Set Timing @ 200MHz : 3.0-3-3-9 2-12-3-2

Environment Monitor 1
Model : ITE IT8718F LPC
Version : 1.00
Mainboard Specific Support : No

Environment Monitor 2
Model : Intel Core CPU [P1, C4, T90]
Version : 15.11
Mainboard Specific Support : No

Temperature Sensor(s)
Board Temperature : 36.00°C td
CPU Temperature : 42.00°C td
Auxiliary Temperature : 25.00°C

Cooling Device(s)
Auto Fan Speed Control : No
System Fan : 1471rpm

Voltage Sensor(s)
CPU DC Line : 1.28V
Aux DC Line : 2.05V
+3.3V DC Line : 3.20V
+5V DC Line : 4.92V
+12V DC Line : 11.67V
-12V DC Line : -12.69V
-5V DC Line : -3.20V
Standby DC Line : 4.95V
Battery DC Line : 3.23V

System Bus(es) on Hub 1
Version : 2.30
System Bus 0 : PCI
System Bus 1 : AGP
System Bus 2 : PCIe 1.00 x16 2.5Gbps
System Bus 3 : PCIe 1.00 x1 2.5Gbps
System Bus 4 : PCI66
System Bus 128 : PCI

LPC Hub Controller 1
Model : NEC Standard PCI to ISA Bridge
Revision : A1
ACPI Power Management Enabled : Yes
High Precision Timer Enabled : Yes
Delayed Transaction Enabled : Yes

Disk Controller
Model : NEC Serial ATA Controller
Interface : ATA
Revision : I1
Channels : 4

Disk Controller
Model : NEC VT82xxxx EIDE Controller (All VIA Chipsets)
Interface : ATA
Revision : A8
Channels : 4

Audio Device
Model : NEC High Definition Audio Controller
Revision : B1
Type : HD (High-Definition) Audio
Version : 1.00
Number of In / Out / Bi-Directional Streams : 4 / 4 / 0
Number of Serial Data Streams : 1

Audio Codec
Model : Realtek Semiconductor 888 High Definition Audio
Revision : A2
Version : 1.00
Audio Channels : 12

USB Controller 1
Model : NEC VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)
Revision : K1
Version : 1.10
Interface : UHCI
Channels : 2
Speed : 48MHz
Supported Speed(s) : Low (1.5Mbps) Full (12Mbps)
Legacy Emulation Enabled : No

USB Controller 2
Model : NEC VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)
Revision : K1
Version : 1.10
Interface : UHCI
Channels : 2
Speed : 48MHz
Supported Speed(s) : Low (1.5Mbps) Full (12Mbps)
Legacy Emulation Enabled : No

USB Controller 3
Model : NEC VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)
Revision : K1
Version : 1.10
Interface : UHCI
Channels : 2
Speed : 48MHz
Supported Speed(s) : Low (1.5Mbps) Full (12Mbps)
Legacy Emulation Enabled : No

USB Controller 4
Model : NEC VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)
Revision : K1
Version : 1.10
Interface : UHCI
Channels : 2
Speed : 48MHz
Supported Speed(s) : Low (1.5Mbps) Full (12Mbps)
Legacy Emulation Enabled : No

USB Controller 5
Model : NEC VT6202/12 USB 2.0 Enhanced Host Controller
Revision : I7
Version : 2.00
Specification : 1.00
Interface : EHCI
Channels : 8
Companion Controllers : 4
Supported Speed(s) : Low (1.5Mbps) Full (12Mbps) High (480Mbps)
Addressing Support : 32-bit
Legacy Emulation Enabled : No

FireWire/1394 Controller 1
Model : NEC VT6306 VIA Fire II IEEE-1394 OHCI Link Layer Controller
Revision : M1
Version : 1.10
Interface : OHCI
Enhanced Support : No
Channels : 64
Speed : 400MHz

System SMBus Controller 1
Model : VIA VT823x SMBus
Advanced TCO Mode Enabled : No
Slave Device Enabled : No
PEC Support : No
Speed : 14kHz

Expansion Slot(s)
PCI0 (1h) : PCI 32-bit +5V PME Full-Length Used
PCI1 (2h) : PCI 32-bit +5V PME Full-Length Available
PCI-E (1h) : PCIe 32-bit +5V Full-Length Available
PCI-E (62h) : PCIe 32-bit +5V Full-Length Available

Port Connector(s)
PRIMARY IDE : ATA
SECONDARY IDE : ATA
SATA1 : ATA
SATA2 : ATA
Keyboard : Keyboard / PS/2 / PS/2
PS/2 Mouse : Mouse / PS/2 / PS/2
USB0 : USB
USB1 : USB
USB2 : USB
USB3 : USB
USB4 : USB
USB5 : USB
USB6 : USB
USB7 : USB
FireWire (IEEE P1394) : FireWire/1394
AUDIO : Audio
ETHERNET : Network / RJ-45

Performance Tips
Notice 224 : SMBIOS/DMI information may be inaccurate.
Warning 2507 : Mainboard has too few memory slots. Upgrading the memory may be difficult or expensive.
Warning 2508 : All memory slots are full. Upgrading the memory may be difficult or expensive.
Warning 2541 : FSB exceeds Chipset rated speed. Reduce FSB.
Tip 2546 : Large memory modules should be ECC/Parity.
Tip 2 : Double-click tip or press Enter while a tip is selected for more information about the tip.


--------------------------------------------------------------------------------------------------------------



System Info:
SiSoftware Sandra

System
Host Name : ZEDEN-PC
User : Zeden
Workgroup : WORKGROUP

Processor
Model : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz
Speed : 2.40GHz
Cores per Processor : 4 Unit(s)
Threads per Core : 1 Unit(s)
Type : Quad-Core
Internal Data Cache : 4x 32kB, Synchronous, Write-Thru, 8-way, 64 byte line size
L2 On-board Cache : 2x 4MB, ECC, Synchronous, ATC, 16-way, 64 byte line size, 2 threads sharing

System
System : Packard Bell BV iXtreme X2711
Mainboard : Packard Bell BV PT890-8237A
Bus(es) : ISA AGP PCI PCIe IMB USB FireWire/1394 i2c/SMBus
Multi-Processor (MP) Support : No
Multi-Processor Advanced PIC (APIC) : Yes
System BIOS : Phoenix Technologies, LTD PBSFC2MB.P07
Total Memory : 2GB DDR2

Chipset
Model : NEC Standard Host Bridge
Front Side Bus Speed : 4x 266MHz (1.06GHz)

Total Memory : 2GB DDR2

Memory Module(s)
Memory Module : Micron 8HTF12864AY-53EE1 1GB DIMM DDR2 PC2-4300U DDR2-534 (4.0-4-4-12 2-16-4-2)
Memory Module : Micron 8HTF12864AY-53EE1 1GB DIMM DDR2 PC2-4300U DDR2-534 (4.0-4-4-12 2-16-4-2)

Video System
Adapter : NVIDIA GeForce 8500 GT (256MB DDR2, 425MHz/986MHz/2x399MHz, PCIe 1.00 x16, SM4.0)

Graphics Processor
Adapter : GeForce 8500 GT (1.01, 256MB, 918MHz)

Storage Devices
ST3320820AS 320GB (SATA300, 3.5", NCQ, 8MB Cache) : 298GB (C 
HP Photosmart C4180 (USB) : N/A (F 
Generic-Compact Flash (USB) : N/A (H 
Generic-SM/xD-Picture (USB) : N/A (I 
Generic-SD/MMC (USB) : N/A (J 
Generic-MS/MS-Pro (USB) : N/A (K 
Optiarc DVD RW AD-5170A (ATA66, DVD+-RW, CD-RW, 2MB Cache) : N/A (D 
MB7820N FLD005C (SCSI, DVD+-R-DL, CD-R) : N/A (E 

Logical Storage Devices
Hard Disk (C  : 298GB (NTFS) @ ST3320820AS 320GB (SATA300, 3.5", NCQ, 8MB Cache)
CD-ROM/DVD (D  : N/A @ Optiarc DVD RW AD-5170A (ATA66, DVD+-RW, CD-RW, 2MB Cache)
CD-ROM/DVD (E  : N/A @ MB7820N FLD005C (SCSI, DVD+-R-DL, CD-R)
Removable Drive (F  : N/A @ HP Photosmart C4180 (USB)
Removable Drive (H  : N/A @ Generic-Compact Flash (USB)
Removable Drive (I  : N/A @ Generic-SM/xD-Picture (USB)
Removable Drive (J  : N/A @ Generic-SD/MMC (USB)
Removable Drive (K  : N/A @ Generic-MS/MS-Pro (USB)

Peripherals
LPC Hub Controller 1 : NEC Standard PCI to ISA Bridge
Audio Device : NEC High Definition Audio Controller
Audio Codec : Realtek Semiconductor 888 High Definition Audio
Disk Controller : NEC Serial ATA Controller
Disk Controller : NEC VT82xxxx EIDE Controller (All VIA Chipsets)
USB Controller 1 : NEC VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)
USB Controller 2 : NEC VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)
USB Controller 3 : NEC VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)
USB Controller 4 : NEC VT82xxxxx UHCI USB 1.1 Controller (All VIA Chipsets)
USB Controller 5 : NEC VT6202/12 USB 2.0 Enhanced Host Controller
FireWire/1394 Controller 1 : NEC VT6306 VIA Fire II IEEE-1394 OHCI Link Layer Controller
System SMBus Controller 1 : VIA VT823x SMBus

Printers and Faxes
Printer : Microsoft XPS Document Writer (600x600, Colour)
Printer : HP Photosmart C4100 series (1200x1200, USB, Colour)

Scanners and Cameras
Scanner : HP Photosmart C4100 (USB)

Network Services
Network Adapter : Realtek RTL8139/810x Family Fast Ethernet NIC (Ethernet, 100Mbps)

Power Management
Mains (AC) Line Status : On-Line

Operating System(s)
Windows System : Microsoft Windows Vista Home 6.00.6000 (Service Pack 3)
Platform Compliance : x86

Windows Experience Index
Current System : 4.1

Performance Tips
Tip 2546 : Large memory modules should be ECC/Parity.
Tip 2 : Double-click tip or press Enter while a tip is selected for more information about the tip.