BGA - fun to solder at home.
No open source board design.
No docs.
What happens if you put them in power chain? 13 chips should feed nicely from 12V PSU - I calculated 1877A of current @ 0.87V - can they handle this?
So far I saw only 1 successful design with high current chip - MrTeal's HF board!
No open source board design.
No docs.
What happens if you put them in power chain? 13 chips should feed nicely from 12V PSU - I calculated 1877A of current @ 0.87V - can they handle this?
So far I saw only 1 successful design with high current chip - MrTeal's HF board!
I also got a reply saying do a go public shortly.
If we go by their November boards with 8 DCDC modules @ 40A
That's [email protected] or around 300W. Per board of one chip, that's only 25-50% of the power density of MrTeal's Hoppin Habs. But if it's worth doing, overdo it by 50+% for them overclocking people
So say [email protected] or about 430W
I hope they can run at something near 1W/GH or they are useless for most of us.
The point is what hashrate will we have @ 1W/GH
True. Only time will tell.
but i can for sure say that the Line Item cost for the VRM can be significantly reduced. A quick look on digikey yielded these numbers:
the VRM used on Jupiter boards is MDT040A0X3-SRPHZ
with
- a cost @QTY1 of 31.55+shipping
- an extrapolated effiency of between 82-85% at maximum load of 40A
A better system can be yielded by replacing the 8 Ericsson modules with:
- 12-16 IR3550 (2 IR3550 to replace each module, or 3 IR3550 to replace 2 modules)
- 2 UCD9248 to monitor and control each individual phase/rail
- supporting electronics: R,C,L
This would yield a system both lower in parts cost and Greater system effeciency, in the neighborhood of 87-92% efficient, thus lowering energy consumption, lowering the ripple currents & voltages to the asic(will help reduce HW errors, and Less stress on the components) and allowing for some great overclocking capabilities if the dies are able to (as was the case for the HF ASIC which was just starved for power until 'Teal got hold of it and fed it.)
this would reduce the BOM for the VRM from ~ 250USD to about 140USD
