Suggestions for low power ASICs

Hey everyone, I'm using an older T15 powered by solar, and I'm curious if there are any newer ASICs for SHA256 that consume less energy (around 1500-1600w max) and have better efficiency. If things don't go as planned, I was thinking about picking up a used S15 since it uses more chips at a lower power, which should make it a bit more efficient. But are there any other options out there?

Yeah you could use a S15 on low power mode, Or a S19 with only 1 hashboard connected and running. You could buy a broken S19 online, you will find a lot of them available, they are not expensive. The last time I gave this suggestion on the forum, mikeywith rightly pointed out that you should be careful about noise, and ideally have the other dead (or not connected) hasboards in the ASIC to reduce noise. A L3++ will give you a great ratio kw/h / hashrate, they are not too noisy, and even if it is a Scrypt ASIC, you could always swap the LTC/Doge to BTC (or directly mine with Nicehash to be paid in BTC)

T15/s15 do not have much support or no modded firmware support if I were you instead buy a used s9 because it's more flexible you can use other firmware like Braiins OS and then use auto-tune to set it mine at that power.

no not if you have 220-240 volt power. the s15 set to low  on stock bitmain firmware. destroys the s9 20th at 900 watts low s15 9 th at 720 watts low s9 with special firmware. one is under 50 watts a th the s15 other is 80 watts a th the s9 Now you must have 220-240 volt power to do this. Edit an old s17 set to low will do 1300 watts and 40th see below 39.76th and 1330 watts braiins+  BTW you could drop lower like 1200 or 1100 or even 1000 The psu fans are a bit loud on this unit  but it would likely work for you.

Or snatch used S19s with one or two damaged/missing hashboards. A single S19 hashboard is about 1000W, or even less with the appropriate firmware... How many TH? about 33 TH/s per board at normal power. For example one of my reports is listing the S19j Pro 104 doing 64TH/s 1343W at the wall with (estimated) chip temp 38C, next most efficient report is the S19j Pro 100 doing 68TH/s 1459W temp 60. Those are two extreme examples using the full 3 hashboard miner, it is way easier when you simply disable/remove one hashboard or two. Its even easier with the XP: 141T doing 104TH/S for 1929W at 60C. The current cost/benefit imo is the S19j Pro.

dont forget the s9j witch is the next modle up from the s9

Does the external cooling lowers the power consumption of any ASIC that we use to mine. Like in theory if machine is getting older then there is high chance of Chips getting hotter, withdrawing more power, to keep up the hash rate demand as it is programmed. So does this mean it gets more hotter and thus fans start running with 100% capacity and withdrawing more energy along the way. Will that be impacting more electricity. Or any of the above doesn’t really make sense because ASIC do not work in that fashion? On the contrary all of the above suggestions are to buy old machines which could be running on reserve oxygens so what’s the point anyways.

Well if they get more and more dust sure thing they will get hotter and hotter. Immersion has this advantage or remaining clean if the tank remains closed. External air cooling has the advantage of more CFM and with less noise too, especially when you can control something like the 8" AC Infinity directly from the control board using the njord adapter.

Yeah surely it can help as I studied this with BitCool Dielectric Coolant technology. If this can be merged with the old ASIC then I think there is higher chances they would outperform with less noise and high efficiency. I’m now clear on one fact that the older the units the more unprofitable they get due to reduced hardware capability. The only fact that remains is whether cooling them to lowest plateau could help them boost their processing activity or not. I’m seeing hundreds of videos where immersion based tech is evolving very fast and it’s even widely used in gaming industries with high GPU powered gaming stations. I think similar steps can be taken into old miner installation if they are resistant to liquid phases.