Windows Vista Ultimate 64bit installed only 3gb ram reconised?

9761 · 9 May 2007 at 19:39

Hi,

Just installed 4gb Ram, 2x 2gb sticks but Vista is only detecting 3.25gb, but I thought this only happens to 32bit users? but im on 64bit.

any ideas

Cob · 9 May 2007 at 20:48

Is there a memory mapping option in your BIOS? If so, enable it.

9761 · 9 May 2007 at 20:55

No Memory mapping option in Bios, Running shuttle SD32G2 and it supports upto 4GB ram

9761 · 10 May 2007 at 18:14

anyone?

Cob · 10 May 2007 at 18:37

Does the POST screen list 4gb?

9761 · 10 May 2007 at 19:09

nope, only shows 3.4gb

9761 · 10 May 2007 at 21:07

Just updated to latest Bios but still showing 3.25gb

KHAN · 11 May 2007 at 07:57

You need to enable memory mapping to do it, I'm not sure if there's some sort of online fix patch, but maybe unless you've got a mobo with the neccesary memory remap option you can't. Mine does have the option and 4gig works fine but didnt' until i set that option.

Bradmax57 · 11 May 2007 at 13:40

9761 said:
Just updated to latest Bios but still showing 3.25gb

odd i have both 32 and 64 bits installed on seperate drives 32 shows up 3.25gb but 64 shows 4gb, didnt do anything to bios (although its not shuttle)

9761 · 11 May 2007 at 18:11

I posted this on the shuttle email thingy and this is the responce:

Dear Shuttle customer,

This is a normal behavior for 945 chip set. The reason is 945 chipsetdoes not support hole remapping function. The chipset could hold upto 4G of memory but the memory address after 3.3G are reserve for PCI resource, there for you will only see 3.3G of memory.

---Best RegardsShuttle Support

Is there anyway I turn the reserve off, Even on side of the box it says it supports 4GB maximum.