Bitmain Antminer S21j XP Hyd (495 Th)

It's living in a colo rack, not at home. Would recommend to anyone with cheap power to burn.

Ordered on the strength of the profitability page. Firmware update pushed on day one, worked without bricking anything. Solo hopes are zero but that isn't why you buy one of these. Invoice was clean and matched exactly what I was quoted.

Set it up in the garage the same night it arrived. Firmware update pushed on day one, worked without bricking anything. Another Bitmain for the Bitcoin side of the fleet. Sent it to the Georgia facility — power bills are a memory.

It's living in a colo rack, not at home. The noise dampening on this model is a real difference. Another Bitmain for the Bitcoin side of the fleet. Solo hopes are zero but that isn't why you buy one of these. Straightforward crypto checkout, no KYC dance for a hardware order. Recommended if you know what you're doing with power planning.

Looked at the same model on three other sites. At 65 dB it's tolerable in an outbuilding. Bitmain's firmware isn't fancy, but it's reliable. At current hashprice the payback maths still works if you have cheap power. Packaging was serious — foam, straps, wooden edges on the pallet.

Arrived in the UK inside a week. The noise dampening on this model is a real difference. Reading 495Th/s steady on the pool. Solo hopes are zero but that isn't why you buy one of these. Would buy from them again, and probably will.

Was on the fence for a few weeks before pulling the trigger. Boots cleanly and joins the pool without any fiddling. Bitmain's firmware isn't fancy, but it's reliable. At current hashprice the payback maths still works if you have cheap power. Wire transfer took a day to clear, packing began the next. Docs on the manufacturer side are thin, expect to Google a few things.

Looked at the same model on three other sites. Started producing shares within about 90 seconds of first boot. Reading 495Th/s steady on the pool. Machine arrived with the original manufacturer seals unbroken. Zero drama, which in this space is high praise.

Bought two, keeping one, hosting the other. Hashboard temps are even, all three boards inside 4°C of each other. Reading 495Th/s steady on the pool. They didn't try to upsell hosting when I said I was running it at home. Running it under their hosting plan in Iceland, first payout hit on schedule. Worth every euro so far.

Came double-boxed with all the accessories. No complaints, would order again.

Bought this after reading a couple of comparisons. Immersion setup was a bit involved but the unit itself is fine in fluid. Bitcoin pool is FoundryUSA and shares are landing every few seconds as expected. Wire transfer took a day to clear, packing began the next. Second time I've done business with Bull Miners, both smooth.