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Quote from: bitcoinmoresh on May 19, 2018, 03:23:57 PM

For you folks who replaced your fans, be aware that with the new firmware that increases hash-rate, the chip temperature will also increase. Might wanna keep any eye to ensure you're getting adequate cooling.

Can confirm utilization increases in my end were less than 75W on two B3s @240V.
(Using one AWP for two miners)

SP120 LEDs still doing the job at 52C in a 25C room.

Wat was the total watts used per miner?

363 watts right now. Was at 338 before the update.
Keep in mind Ive completed a fan swap. Those stock fans pull about 1.6-1.8A each.
The consumer grade fans only pull .25A. So Im cutting a bit off the wall there.

Something to think about. From a regulatory standpoint, Bitmain can only really increase power consumption +-10% before running into compliance issues. Especially without warning consumers about an increase outside of the known envelope. The changelog for these updates were vague at best.

Wat fans are those and wat rpm do they spin at?? U are saying the stock fans used 160-180watts? That cant be right...

Well, at least now we dont have to worry about GPU at all even if their rates improve I would think

Stock fans are 1.8A@12V. Everything in those miners is 12V. So about 20-25W per fan.

Switched to Corsair SP120 LEDs@.25A (12V Grin

) and just a hair over 2000RPM.

Oh ya. It is 12 volts haha
2000rpm isnt smart. The current fans can go above 5000+ rpm easy. U dont want them under cooled and risk damage.

You know, I know youre right. Theres 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 theres enough static pressure with two of these quiet fans. Ive 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 theyre not clocking in at 1020W, so the TPU ASICs are likely not running full clip.

Theyre likely low corner ASICs with too many dead cores to run in a Sophon product.
Theres also no external DDR in this configuration. So theres 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 Im not mistaken.

All signs point to a device that either didnt 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.

If the power consumption goes up when that happens, and I havent fried my miners by then, Ill swap the stock fans back in.
Maybe it wont be 114F in my garage when that happens. Cheesy

lol seems u know alot. Hmmm i dunno if 80 degrees is the frying point because while the S9 can take 80 degrees, the L3+ would be a toasted toaster at that temp. Well, hopefully u are right. If I were u, I would still get one of those quieting boxes and use the original fans. Considering the cost of these miners, I wouldnt risk it. Anyways, thats just me.

Just my 2 cents.