I have Raspberry Pi 512MB and XBMC installed.
First what comes up was OpenGL Spectrum visualiser does not working. Shows a slowly turning area of flat squares, whilst it should be a lot of bars.
Another thing I have noticed is that none of "more demanding" screen savers does not work. When I try to set Euphoria, Plasma or Solar Wind screensaver and I do "Preview" I can see a black screen and when I press anything to go back to setting screens my Raspberry reboots.
GPU: VideoCore IV HW
OpenGL provider: Broadcom
OpenGL ver: OpenGL ES2.0
Measured voltage: never gets lower than 5.09V (I use good quality 5V 2A power supply).