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Win7: Know the DDR3 memory limits!

X-ROG
Level 15
http://msdn.microsoft.com/en-us/library/windows/desktop/aa366778(v=vs.85).aspx

Theoretical limits:
32-bit Windows: 4GB of system memory (including graphics)
64-bit Windows: 8TB

Real-world limits of each OS version:

Version Windows 7 Ultimate x64
192 GB
Windows 7 Enterprise x64
192 GB
Windows 7 Professional x64
192 GB
Windows 7 Home Premium x64
16 GB

Windows 7 Home Basic x64
8 GB
Windows 7 Starter
2 GB

For many users running Home Premium x64 and also Rampage motherboards with very large memory: 24GB/32GB/64GB - you will need to run Professional or Ultimate to make full use of the memory space.
47,257 Views
5 REPLIES 5

Ark2577
Level 7
What if you have W7 Ultimate 64bit on a Rampage 3 extreme and you install 24Gb of ram but only shows 16GB?

Doun load memtest check your sticks. Check your seats on sticks.

Ark2577 wrote:
What if you have W7 Ultimate 64bit on a Rampage 3 extreme and you install 24Gb of ram but only shows 16GB?



Then two things, either your ram is not seated correctly or you have faulty hardware.

Use the memtest86+ guide in my sig to find out which.
To help us help you - please provide as much information about your system and the problem as possible.

coldair
Level 7
check your sticks of ram one at a time
Intel 3930K
ASUS Rampage IV extreme
16GB (4x4096) Dominator CMT16GX3M4X2133C9 Ram
Corsair Force 3 180 gig hard drive
3TB raid drive
Seasonic 1250 watt PSU
2 EVGA 285 copper
Windows 7 64 SP1
Apple keyboard, Razor Naga Mouse, Dell 30 monitor, Thermaltake SwordM case separate box for 2 ThermoChill PA120.3 Triple 120mm Radiator ,two XSPC 250 Passive Aluminum Reservoirs, two MCP655™ pumps

Sulaco22
Level 7
This is a little weird, I've just finished my new build using Win7 Pro, I installed 4 sticks of 4GB Kingston HyperX and the BIOS shows

33638

However, I am only showing 8GB here

33639

Any suggestion?