Topic: Bitmain launches the Z9 Equihash miner - page 31. (Read 37211 times)

I'll be interested to see how both of your are doing in the next couple of weeks. Most GPU's start throttling at 80C in terms of performance but who knows how these will hold up.

One person in this thread has reported theirs died inside within a couple of days of extreme overclocking but you hear that about every version of Bitmains miners, there are always a few that have immediate or near immediate failures.

I guess it could be argued how much more profitable the miner could be at 15-16 vs 12-13k vs power usage. at 575Mhz mine are running under 66C with fan set on auto and between 12.5-12.8K, haven't pulled power usage at this speed though.

The net result for ~3k additional hashrate is running the chips at 10-15C hotter and who knows what power usage... I'm wondering if its worth it if the miner dies in the short term (under 90 days).

I'm not sure about everyone's apprehension with 70C+ temps. With 95F+ ambient temps and at stock speeds, my Z9 runs 73-76C with the fan set to auto. When I move the fan to 100%, the temp drops to 66-68C. When I move the unit up to 750Mhz and set the fan to auto, it runs close, but not completely at 100% with the same 73-76C temps. If I move the fan to 100% at 750Mhz, the temps stabilize around 71-73C.

The specified operating environment for the Z9 Mini is 0-40 ℃ (32-104F). So in an environment that falls within those specifications, the software is trying to keep my Z9 in the low to mid 70s. That tells me this is a fine temperature for the unit.

I ran mine for a couple days in my 102-104F mining room. Clocked at 750mhz the temps were in the low 80C's. I've since moved it to sitting on top of my water heater with a heat pump (see my post above) just to reuse the heat to heat the water. Temps are now in the low 60C's, plus I get about 2000 extra Sols/s with the cooler temps.

I don't think anyone really knows what the correct chip temps are. There is a lot of talk these chips being more like GPUs or FPGAs. Most people try to keep their GPUs below 75C, but temps into the high 80C's are not really an issue. In case anyone asks, my temps of my gpus are 55C - 65C.

I'm not sure about everyone's apprehension with 70C+ temps.

How did you attached that fan? With screws?Please post a picture if you can.

Question about overclocking beyond the 750 mhz...

Is getting more options as simple as editing the file on the miner that is used to generate the web page?

I tried using my browsers developer tools, I added 775 and 800. Switched to 775 and it seems to have gotten slower.

Browser's developer tools = right click, inspect element, edit the html...

These chips are more vulnerable to temperatures. I already talked before, that 70C is a lot for them. My Z9 is in stock of DHL since Friday (some bastards). The first thing I do is put a fan of the S9 at the exit. It has to lower temperatures even at 800mhz

Unfortunately no, trying to build a solution similar to my L3+ voltage app, but currently I had to hack into the voltage controller and control it externally via a Raspberry pi. This is what it looks like, and doubt most people will want to do this to their brand new units:



Seems like bitmain saw what I was doing with their L3's and they shut off the user space i2c interface which controls all this stuff, they also haven't release the firmware so I can't hack that to enable it. Either way even if I can get it working with the internal controller, you will still have to pull your boards and shunt two resistor pads to connect the voltage controller i2c lines, they also purposely set these lines disconnected so there is no possibility for normal users to change anything.

All this makes sense when you look at the hardware, they are running these way below half power of what they can output...so they REALLY don't want people to know this. These things are polaris sized dies ~200mm^2. Each of these dies can easily do 100 watts each with proper cooling (vs the stock 20 watts). This is definitely the most advanced ASIC bitmain has made, and you can see all the billions they are making is going into serious R&D.



Even their voltage controllers are in the "GPU" territory now. This is run by an advanced muti-phase regulator. This particular board has 6 phases, with only 4 phases used. Each phase has a 60amp capability, so total output of 240 amps. Stock voltage is set at 800mv so were talking 200 watts PER BOARD, with only 80 watts utilized. Im already order parts for the rest of the phases since I'm already running near the max with 20 KSols/s I'm running now. That will bump things up to over 300 watts and over 25KSols/s. These chips will definitely be running at 2KSols each in their big miner.

I changed the frequency to 656.

Did you overclock it?