Well I have the SD/FF it's the External one that Power supply. All seems to work well, the display is clear and yes does look a little VGA like (as I would expect), but after a short period of use, you get some graphic trashing. I also saw this in Workbench as well as in the games.
I checked the SD/FF and it feels a little warm but certainly not hot. Apart from sticking a fan onto it (which I have seen some people have done), is there anything else that could be causing this?
Rgds
Jonathan