[tuxen]

I have a dynamic overlock until 900Mhz, but Bogomips always shows 600Mhz (no idea where it comes from). Something's definitely not OK here.

Odd it should read as 700Mhz (697) I assume it's only in these builds to?

What do you mean? I can provide a pic or logs if required.

vcgencmd measure_clock arm via SSH always reports correct current value.

Oh. It reads 600mhz when measuring it from ssh? Very odd.
If I measure it it reads out correctly 1050mhz but in XBMC it show as 697 bogomips So when you where idle it should read that in XBMC as well that's what I meant. I thought that you mean XBMC showed wrong bogomips like mine. What does it show in XBMC just out of curiosity then.