I don't know if this matters, but cpuinfo reports the same specs for the chip in the n900 as the 3530 in the beagleboard, which is used in the Touchbook as well:

http://www.metoolabs.com/index.php?v...1844=fdtnphqgi

The relevent part:

root@beagleboard:~# more /proc/cpuinfo
Processor****** : ARMv7 Processor rev 3 (v7l)
BogoMIPS******* : 496.77
Features******* : swp half thumb fastmult vfp edsp
CPU implementer : 0x41
CPU architecture: 7
CPU variant**** : 0x1
CPU part******* : 0xc08
CPU revision*** : 3

So there might be some headroom in the chip afterall, assuming the cooling is as good as the Touchbook.