Yes I use the Sideport memory but this has no effect on 1080i playback because 128MB is simply not enough (every recommendation for 1080i states this: min 256 MB VRAM), the system RAM will be used always. I had a X2 before and could not get proper deinterlacing for 1080i, because of this i made a Phenom upgrade.
I could deactivate the sideport memory in Bios but this is not the configuration you want to test.
An added GFX would solve the problem because of the dedicated vRAM of it (DDR-RAM is the bottleneck of the 1080i deinterlacing!!! controlled by HyperTransport, 2.0 is capable only of "bob", 3.0 is enough for adaptive)
I could deactivate the sideport memory in Bios but this is not the configuration you want to test.
An added GFX would solve the problem because of the dedicated vRAM of it (DDR-RAM is the bottleneck of the 1080i deinterlacing!!! controlled by HyperTransport, 2.0 is capable only of "bob", 3.0 is enough for adaptive)