So I went into the Performance Information and Tools whatsit and brought down a list of my system hardware and spec.. Something tickled me wrong.
In the graphics section it says I have 1GB dedicated memory, which makes sense shince I have a 1GB GTX 460 but it also has 1790MB down as shared system memory. I've disabled the onboard video so I don't understand why that would be there?
And could this be the cause of my graphical showy woes?
N = ((4096 - 512)/2 - 0)
N = (3584/2 - 0)
N = 1792 - 0
N = 1792
It's just memory that Windows has set aside (but will still share with other applications) for GPU use should it be required. I believe it's possible to disable it, but I would leave it alone.