Re: ANN: BITMAIN has Tested Its 28nm Bitcoin Mining Chip BM1382

Release B4 Grin

they are likely using the last few days to ensure happy B1-B3 customers. By the end of the week almost every order should be shipped and they can offer 48-hr shipping on B4 onwards.

also, they probably need a few days to redesign the miner to achieve 500GH if its possible.

500GH Would be devine. Hopefully BITMAIN can do it.

They told me they won't redesign it (I asked more info the DC/DC component).

I got one unit that run at 250 mhz at ~503 GH/s (0.001% error rate)
The other one, running at stock at ~434 gh/s (Any OC kill the performance)

I understand them, it would need a new design using different power chips and they probably have a nice stock of the actual PCB. The best way would be to use buck controller with external power MOSFETs instead of buck converters, but it will also cost slightly more.
For those running under specs, you can also check the voltage provided to the chips.
If for some reason the resistors that define the voltage for the buck converter are both at opposite side of the tolerance, it will give lower voltage than expected or slightly higher, depending on what value they are.
For overvolting, there will be 8 resistors to replace on each PCB to raise the voltage. I gave values to expect in an earlier post in this thread. And yes, it will worth the extra power draw for a few monthes.
If someone can make HQ pictures of the area around the coils, I'll probably be able to tell which resistor to replace before my S3 arrives.