4 gig memory performance

[4np]

From Bootcamp on the 15" MBP, XP/Vista only saw 2.98GB of ram as reported by checking the properties of "My Computer".

OSX Reports seeing all 4GB by checking "About this Mac".

That's because windoze is 32 bit....

 

[tobyg]

That's because windoze is 32 bit....

That's not the only answer. It does have to do with the ram having reservations below 4GB for addon cards and their firmware/bios because of 32 bit limits. But I've installed many HP servers with 4+ GB of ram with 32 bit Windows 2003 server and it is able to see and address all of the RAM. So it has a lot do with the BIOS.

On my Mac Pro, XP will only see 2GB of RAM. I have 7GB installed.

 

[Wolfpup]

That's not the only answer. It does have to do with the ram having reservations below 4GB for addon cards and their firmware/bios because of 32 bit limits. But I've installed many HP servers with 4+ GB of ram with 32 bit Windows 2003 server and it is able to see and address all of the RAM. So it has a lot do with the BIOS.

On my Mac Pro, XP will only see 2GB of RAM. I have 7GB installed.

Are you it was a 32-bit version? I know some Xeon processors had 36-bit addressing even prior to 64-bit support.

 

[resrever]

Old Macbook Pro C2D really capable of more than 3GB?

...
And yes, I have 4GB in my machine and I only see 3.3 GB usable.

Hm, I cannot confirm this: I have 2x2GB installed in a Macbook Pro C2D (not Santa Rosa). However, I only see 3 GB. The exact same amount as with 1GB + 2GB. What do I have to do in order to get that extra 300MB of RAM?

Thanks for any help!

 

[Wolfpup]

Hm, I cannot confirm this: I have 2x2GB installed in a Macbook Pro C2D (not Santa Rosa). However, I only see 3 GB. The exact same amount as with 1GB + 2GB. What do I have to do in order to get that extra 300MB of RAM?

Thanks for any help!

The amount it sees is going to vary depending on your exact hardware configuration. It can vary between about 2.5-3.5GB.