I've got a Gb of memory missing?

diogenese

diogenese

diogenese

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Joined
18 Oct 2002
Posts
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Location
Temuka, New Zealand
I have 4 1Gb Geil ram modules in my P5B, but in System properties it shows I have 2.93Gb :( What's happened to the other Gb?


Here is a snip from Sandra..
SiSoftware Sandra


Mainboard
Manufacturer : ASUSTeK Computer INC.
Multi-Processor (MP) Support : 1 Processor(s)
MPS Version : 1.40
Model : P5B-Deluxe
Type : Mainboard
Version : Rev 1.xx



Logical/Chipset 1 Memory Banks
Bank 0 : 512MB DDR2 4.0-5-5-12 CR1
Bank 1 : 512MB DDR2 4.0-5-5-12 CR1
Bank 2 : 512MB DDR2 4.0-5-5-12 CR1
Bank 3 : 512MB DDR2 4.0-5-5-12 CR1
Bank 4 : 512MB DDR2 4.0-5-5-12 CR1
Bank 5 : 512MB DDR2 4.0-5-5-12 CR1
Bank 6 : 512MB DDR2 4.0-5-5-12 CR1
Bank 7 : 512MB DDR2 4.0-5-5-12 CR1
Maximum Installable Memory : 8GB
Supported Memory Types : DDR2
Channels : 2
Memory Bus Speed : 2x 310MHz (620MHz)
Maximum Memory Speed : 2x 233MHz (466MHz)
Multiplier : 1/1x
Width : 64-bit
Memory Controller in Processor : No
Performance Acceleration Technology : Yes
Refresh Rate : 7.80µs
Power Save Mode : No
Fixed Hole Present : No
Maximum Memory Bus Bandwidth : 9.69GB/s


Memory Module 1
Model : CL4-4-4DDR2-800
Extended Information : Golden Empire Int Ltd
Serial Number : 00000005
Type : 1GB DIMM DDR2
Technology : 16x(64Mx8)
Speed : PC2-6400U DDR2-400
Standard Timings : 5.0-5-5-18
Version : 1.2
Date of Manufacture : 24 September 2006
Memory DC Line : 1.80V
Set Timing @ 400MHz : 5.0-5-5-18
Set Timing @ 267MHz : 4.0-3-3-12
Set Timing @ 200MHz : 3.0-3-3-9

Memory Module 2
Model : CL4-4-4DDR2-800
Extended Information : Golden Empire Int Ltd
Type : 1GB DIMM DDR2
Technology : 16x(64Mx8)
Speed : PC2-6400U DDR2-400
Standard Timings : 5.0-5-5-18
Version : 1.2
Date of Manufacture : 24 September 2006
Memory DC Line : 1.80V
Set Timing @ 400MHz : 5.0-5-5-18
Set Timing @ 267MHz : 4.0-3-3-12
Set Timing @ 200MHz : 3.0-3-3-9

Memory Module 3
Model : CL4-4-4DDR2-800
Extended Information : Golden Empire Int Ltd
Type : 1GB DIMM DDR2
Technology : 16x(64Mx8)
Speed : PC2-6400U DDR2-400
Standard Timings : 5.0-5-5-18
Version : 1.2
Date of Manufacture : 24 September 2006
Memory DC Line : 1.80V
Set Timing @ 400MHz : 5.0-5-5-18
Set Timing @ 267MHz : 4.0-3-3-12
Set Timing @ 200MHz : 3.0-3-3-9

Memory Module 4
Model : CL4-4-4DDR2-800
Extended Information : Golden Empire Int Ltd
Serial Number : 00000003
Type : 1GB DIMM DDR2
Technology : 16x(64Mx8)
Speed : PC2-6400U DDR2-400
Standard Timings : 5.0-5-5-18
Version : 1.2
Date of Manufacture : 24 September 2006
Memory DC Line : 1.80V
Set Timing @ 400MHz : 5.0-5-5-18
Set Timing @ 267MHz : 4.0-3-3-12
Set Timing @ 200MHz : 3.0-3-3-9
Click to expand...
 
InkZ said:
Yup, won't go above 3 gig if you're running XP/Vista 32 bit.
Click to expand...

4GB of RAM is the maximum memory that the 32bit copy of XP can handle (2^32=4294967296, or 4.2 billion) can access 4096MB, or 4GB. There is however a 2GB limit each application can have in the virtual address space.

With 4GB of physical RAM many motherboards will reserve at least 512MB in the address space. That is why it will only show ~3.5GB of RAM.
 
Address space isnt 'reserved' its just simply lost by some people. I had 4GB or RAM and a 512MB graphics card, and It showed 3.5GB in windows, so a full 4GB was being addressed across RAM and GFX. Some people only see 3GB with the same setup.
 
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