Went from 5.2Gh/s to 7.5Gh/s with same error count!
I managed to break 2 blades from the BFL fan (cheap quality plastic) while doing this. Be careful with removing it or powering it while not mounted on the heatsink.
Some Jal got AT32UC3A1128 or AT32UC3A1256 and both are same but ram size 128K and 256K.
The default debug compile fits into 128k (just)
When I tried a release compile it failed coz it was above 128k - so I went back to the default debug compile.