|27 Mar 2010||#3|
You're confusing HyperMemory,
which uses system ram up to a fixed point as needed (also called TurboCache on Nvidia cards) with how Windows 7 (and Vista) report video memory. Basically what it is is a pagegfile for the video card to use if needed, nothing is taken from system ram and it is a total of the dedicated video ram and the virtual memory allocated to the video card (based on the amount of system memory and dedicated video memory),
Shared system memory is a portion of the system memory that can be used by the graphics subsystem when needed. For discrete graphics adapters, this type of memory is often referred to as “non-local video memory”—that is, far from the GPU. The shared memory is available to other subsystems or non-graphics applications when it is not being used by the graphics subsystem. Thus, it is never guaranteed to be available for graphics because it could already be in use.
It can get a little technical, but the basic concepts are fairly easy to follow.
|My System Specs|
|28 Mar 2010||#5|
That "total memory" in dxdiag is based on the amount of system ram, dedicated video ram and what Windows allocates to virtual video memory (like a pagefile). In your case it probably comes down to the card doing something more or less that caused the Hypermemory to use more or less of the system ram, and that would cause the change in the "total memory".
|My System Specs|
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