Hello. My computer has a P5G41TM LX motherboard. Asus says the integrated VGA has 1GB of memory:
Integrated Intel GMA X4500 graphics
Maximum shared memory of 1G
Supports RGB with max. resolution 2048 x 1536 (@75Hz)
Supports Microsoft® DirectX® 10
http://www.asus.com/Motherboards/Intel_Socket_775/P5G41TM_LX/
Speccy says: 1806 MB (see attached capture) - Is there something wrong ?