You know, I know you’re right. There’s very likely some overtaxed component on the DCDC chain that needs the airflow regardless of how cool the chips are.

I will probably end up frying these guys.

But from a PCB/Chip temp perspective, I am 100% confident that there’s enough static pressure with two of these quiet fans. I’ve been running a decent QTY of Sophon SC-1 cards since February of this year, and have had no problems running the chips up to 80C while pushing a constant data stream through the API.

From the tear downs posted on other threads, we know these miners are indeed powered by the exact same BM1680 as the SC1s. So Im just working from that frame of reference.

An SC1 running a full and sustained workload will pull about 85W on the 12V rail of our servers.
A B3 is 12 BM1680 chips. We know they’re not clocking in at 1020W, so the TPU ASICs are likely not running full clip.

They’re likely low corner ASICs with too many dead cores to run in a Sophon product.
There’s also no external DDR in this configuration. So there’s a few watts shaved off there.

Given that bitmain usually has a habit of running about 80-135W per PCIe connector, it sure looks like they were expecting it push about 600-750W. The heat sink is a beefy structure. They also used thermal pads between the hashboards (making contact with both). This is a first for Bitmain if I’m not mistaken.

All signs point to a device that either didn’t reach its potential after development, or one that has a LOT of headroom to grow as a more functions and op codes are added to the BYTOM (or other Tensority) blockchains.