Quote from: GenTarkin on August 16, 2013, 02:56:43 PM

http://www.ti.com/product/tps40193
The Iout, is what I was referring too, your saying thats just a soft limit?
Are the mods you speak of .. capable of working on b2 units as well? (I dont know if anything changed from b2 to b3 hash boards...)

Yes, in IC specs says it's capable of driving "up to 20A". But is not an "enforced" limit, it's up to IC ability to charge/discharge the gate charge of power mosfets.
For the low side:
IC's reference design= 1x IRF7834: Rds=4.5mohm, Id=16A, Qg=29nC
Avalon= 2x CSD16403Q5A, so Rds=1.1mohm, Id=56A, Qg=27nC
For the high side:
IC's reference design: 1x IRF7466: Rds=12.5mohm, Id=11A, Qg=23nC
Avalon(in reality): 1x Rds=4mohm, Id=100A, Qgate=39nC
IC reference design is for 10A. Based on this and mosfets' figures, I'd say IC+mosfets in Avalon are able to drive 40A.
Of course there are other limiting factors: PCB traces, Inductor, Filtering capacitors.
Inductor seems to be a Vishay Dale IHLP-5050FD 1.5uH, but I'm not 100% sure. If it is, it's specified at up to 27A (with a "hard" limit at 45A).
One thing over another, I'd say Avalon's hash unit power supply should have no problem in handling +40% more current (~20% overvoltage and overclock versus the "stable" 350MHz. But this would mean ~+70 power which I'm sure Avalon CANNOT handle as it is, at least for batch #3.