|Jun 24, 2009, 06:46 PM||#1|
MBP: Why is only 3.72GB of RAM usable in Windows 7 x64?
Just installed Windows 7 x64 on a new Macbook Pro with 4GB of RAM. When I go to check the specs it says "Installed memory: 4.00GB (3.72GB usable)"
Do I need to update a driver or bios?? My first thought was that it was sharing video memory, but my previous gen unibody Macbook has 2GB of RAM and all of it is usable in Windows 32-bit, none of it is shared. Both Macbooks have the same GPU so why isn't the total amount of RAM usable in x64 version of Windows?
Last edited by cool8man; Jun 24, 2009 at 06:59 PM.
|Jun 25, 2009, 05:53 PM||#3|
It's probably the 256Mb of video memory allocated for the 9400M GPU which Windows can't see or use because Apple haven't created a Windows driver to access it via EFI.
You only had 2Gb ram in your previous setup, my uMBP running 7 32 bit says I can only use 2.98 Gb out of 4Gb but that's normal for 32 Bit Windows.
Mac Pro 3,1 8x3.2 32gb GTX 680, 17" uni i5, iMac 2007
iPhone 4s x2, iPhone 4, iPad 4, 3x iPad 2, 2 x Touch 3G & Classic 160Gb.
2TB TC 3G, A Extreme 5G, A Express N 2G
|Jun 25, 2009, 06:32 PM||#4|
Yeah that must be what it is. The previous macbook had Vista so I guess Vista just didn't report usable memory, only total memory and now Windows 7 indicates usable memory.
Now I just have to get a driver fix for the speakers, the mic, the audio line out, and the keyboard backlight and I'll be all set.
Very happy with the new Macbook though. I was able to have Slingbox HD stream running at 1920 x 1200 on an external monitor while browsing the web on my macbook screen without any hick ups.
13" MBP 2.53GHz, 4GB, 160GB Intel SSD
64-bit Windows 7 Home Premium
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