Why does my 2012 iMac with a 512 gfx card only recongise 256 in bootcamp

Hi,
I brought an 21" 2012 iMac recently, and i have installed windows 8 on bootcamp for games.
I have installed latest bootcamp drivers and downloaded the Nvidia GeForce GT 640M drivers and installed everything.
But for some reason when i check things like can i run it, the system only recgonises that i have 256MB of graphics memory.
I have rebooted into osx and check and it is defo 512.
Any ideas?

I have exact same problem with my 15in MacBook Pro with 1GB graphics memory. It only recognises 256MB. Is this just a software reporting bug or is it really restricted to 256MB?? Wish I could find the answer. Apple support is non existant.... of course....blame it on Windows!
Can't help.... but you're not alone!

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Introduction
After I received my new iMac with a 3 TB Fusion Drive, I was disappointed when I realized that Bootcamp was not running on this model and prevented me from installing Windows on it. I wanted to take advantage of the powerful iMac hardware to play games but I couldn't.
There are a few ways of working around this limitation, but I found most of them quite complex and most of the time they required formatting the internal hard drive or repartitioning it and go for a brand new installation of Mac OS X. I was not comfortable with that.
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It will make you erase all your data from your external USB3/Thunderbolt hard drive
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What this will not make you do:
It will not make you modify anything on your internal Mac hard drive
It will not make you use or install the bootcamp assistant
It will not activate the Preference Pane for the default boot drive. You have to boot by pressing the ALT key to manually select your boot drive each tome you want to boot Windows.
What you'll need
An external hard drive with a USB3 and/or Thunderbolt connector. This drive will be formatted so ensure you saved your files before going further. You can use either an SSD drive or a classic hard drive.
A Windows 7 or 8 install DVD or ISO (check whether to install 32 or 64 bits versions based on your Bootcamp drivers) and the corresponding Windows serial number.
One of the following:
Mac OS X with a Windows 7 or 8 Virtual Machine (use VMWare Fusion or Parallels Desktop for example. Note: VMWare Fusion seems to have some issues with Thunderbolt and USB3. Plug your drive to a USB2 enclosure or hub to work around this -it worked for me-, or use another VM software) → Read the important note below
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A USB stick to store your bootcamp drivers
IMPORTANT: If your Mac has a 64 bits processor, your Windows Virtual Machine on OSX, your Windows installation on your PC and your Windows DVD/ISO must also be in 64 bits!
Step by Step guide
Step 1: Get the install.wim file
If you have a Windows ISO file:
Mount the ISO
If you're on OS X: double click on the ISO file
If you're on on Windows 7: Use a software like Virtual Clone Drive (free)
If you're on Windows 8: double click on the ISO file
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Open the command prompt in administrator mode (cmd.exe). To run it in administrator mode, right click on cmd.exe > Run as admin.
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diskpartType the following and hit enter to list your drives:
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select disk #Clean all partitions by typing the following (warning: this will erase all data from your external drive!):
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format fs=fat32 quick
Set this partition to active by typing:
active
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If you've done all the previous steps from your Mac using a Virtual Machine, ensure the external drive is plugged in to a USB3 or Thunderbolt port. Using USB2 should also work but you'll get very poor performance so I don't recommend doing that.
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On the boot selection screen, choose "Windows" using the arrow keys on your keyboard, then press enter.
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