Is this a good choice if I can buy them for $3400-3500 each? I've heard that Whatsminer is generally a reliable brand.
Way overpriced, ROI is over a year at this rate, I wouldn't buy it for that price, not a chance in heaven.
My whatsminers are pretty much dead.
2x 20s
1x 21s
1x 10
That's weird, based on my own experience it's just the opposite, you had luck with the 17 series of Bitmain when the majority of people I know didn't, strange, by the way, did you place those miners close to one another? here is one thing most people don't know about whatsminer, the miner case itself acts as a heatsink, if you touch any other brand from the outside, it will be cold, whatminer will be very hot to touch which is how it was designed, based on that, they need to be spaced well.
Anyone have a suggestion for a good supplier for the KZ14038B012U fans?
The part number is a bit confusing. All the 20 series share the same fan size, but they differ in the connector, what is yours? is it
4 or 6 pins? flat or square? the last piece of info is all that matters, if your PSU wasn't changed before, then you likely have a 6pin flat connector.
The good ones are pretty expensive and hard to find, let me know how many you need and the connector type, also a delivery address and I will get you a quote.