[popcornmix]

Also popcornmix can you answer this question please. From testing there is def a limit to core=600 (any further and it defaults it to 500) but is there a limit to sdram? and if so what is it?

I think this limit has now gone. I did get a particularly fast Pi and went through the code increasing some of the sanity checks (back in April).
I believe I had:

Code:

arm_freq=1250
core_freq=610
sdram_freq=610

working and actually using those frequencies. I think sdram_freq and core_freq limit is now 750MHz, and arm_freq is 1500MHz.