Verify failed between adress xxxx and xxxx (corresponds to SSRAM adress)

If your hardware is directly driving the LCD panel, the pixel clock rate isn't that important.

When I was doing it (actually from an SA1100/1101 ARM system) at slow rates I saw some visual flicker (and odd/even frame differences).

Very slow rates (frame rates < 1Hz) showed some interesting effects!.

I ended up changing the pixel clock frequency on the fly (mid frame) in order to stop the video dma underrunning when the cpu was doing slow cycles on the shared bus.