10:23:37 <sech1> A bit of recreational math: https://paste.debian.net/hidden/c43e2081/
10:23:48 <sech1> This whole mining operation wasn't really profitable to Bitmain
10:23:58 <sech1> unless they found really cheap electricity in Hong Kong
10:24:43 <sech1> hmm, why did I count 44 months
10:24:50 <sech1> it should be 20 months
10:25:33 <sech1> anyway, even with 20 months, both mined XMR and spent $$$ will have the same proportion
10:44:03 <m-relay> <h​bs:matrix.org> The machines may be hosted somewhere where electricity cost is cheaper, but even in the cheapest location it would still be about 4M for power (for 44mo)
10:46:34 <kico> we really need to know how expensive the thing is
10:46:48 <kico> this would only make sense if they can make then realllll cheap iGuess
10:48:40 <m-relay> <e​ndor00:matrix.org> https://matrix.monero.social/_matrix/media/v1/download/matrix.org/qoqZyIAugoAnWQLpmlhgnucf
10:49:01 <m-relay> <e​ndor00:matrix.org> "There is no official prices from Bitmain but many providers are showing similar prices"
10:51:16 <m-relay> <e​ndor00:matrix.org> Which would mean ~66 H/s/$, compared to ~20 H/s/$ (ish) for a Ryzen rig
10:51:19 <m-relay> <e​ndor00:matrix.org> (assuming ~1000$ for 20 kH/s)
12:08:21 <sech1> They can dump it for any price, really. It looks more like a firesale for this specific project
12:11:33 <m-relay> <x​fedex:matrix.org> endor00: 1000$ for 20 kH/s? Ryzen 5900X costs €350 on amazon and does 17 kH/s
12:12:04 <m-relay> <e​ndor00:matrix.org> xfedex and what about the rest of the entire rig? :D
12:15:12 <m-relay> <x​fedex:matrix.org> I guess you can get a good and fast RAM stick with 100€, and 150€ for a motherboard, plus an ugly case, plus power supply and stuff you should be able to make it for €600
12:21:14 <m-relay> <e​ndor00:matrix.org> That's already €600 before the psu (a decent one will be another €100) and case, plus a decent cpu cooler, plus some basic storage (though technically you could run it off of a usb stick). So we're in the €800 range - and that's assuming that you can actually find stuff that cheap in your area
12:22:59 <m-relay> <e​ndor00:matrix.org> So on a good day we're looking at ~25 H/s/$ - still less than half
12:26:46 <sech1> you don't need a decent cpu cooler if you're optimizing for power efficiency
12:27:01 <sech1> 5900X will be using no more than 60 watts
12:27:27 <sech1> any AMD stock cooler will do
12:28:19 <m-relay> <e​ndor00:matrix.org> But then you're also cutting down on the hashrate, which will reduce your H/s/$ figure, right?
12:29:41 <sech1> h/s/watt is more important
12:30:29 <sech1> Like I said, Bitmain can put any price on these devices
12:30:38 <sech1> for them, it's a scrap that they need to dump
12:31:05 <m-relay> <e​ndor00:matrix.org> Of course, I was just comparing the hashrate cost
12:31:29 <m-relay> <c​trej:matrix.org> How many hashes does a power optimized 5900x do, typically?
12:46:21 <m-relay> <x​fedex:matrix.org> ceetee: https://xmrig.com/benchmark is your friend
12:47:52 <nioc> yes but he asking for power optimized
12:49:44 <nioc> my 3900x somewhat power optimized at 3.8GHz and 1.0125v(?) gets ~14.6Kh/s
12:51:23 <m-relay> <c​trej:matrix.org> with b die?
12:51:57 <nioc> yes, ram optimized 
12:53:31 <m-relay> <c​trej:matrix.org> thanks nioc
12:53:38 <nioc> yw :)
12:57:15 <m-relay> <h​bs:matrix.org> The benchmark site gives figures I've always found hard to replicate. A 16 core EPYC 7313 is listed at 15 kH/s when out of the box I found it more around 9 kH/s so detailed config/tuning is key to obtaining the displayed performance.
13:01:38 <nioc> if I let my CPU run stock I get similar HR but the cpu power draw is 2x and it runs very hot
13:25:20 <m-relay> <c​trej:matrix.org> Extrapolating some numbers from here: A 5950x can be had for as little as 420€ in deals, with mainboard (100€), 2x8GB B die (70€) and a boot USB stick (10€) you get about 20kH/s for 600€, power draw should be less then 100w. That means a single high efficiency platium power supply (120€) can be shared between multiple boards. You'd also need a few land cables and a cheap switch (40€)
13:25:20 <m-relay> <c​trej:matrix.org> 4x 5950x should have a combined hash rate of 80kH/s, and the entire setup would cost about 2600€ (= 2800 USD) if one can get away without buying cases.
13:25:21 <m-relay> <c​trej:matrix.org> So in total 28.5H/s/$ seems possible. I thought it would be even cheaper, but had some numbers mixed in my head.
13:26:41 <m-relay> <c​trej:matrix.org> Just trying to put the bitmain thing in perspective with current hardware prices
16:07:24 <hyc> it seems likely they can beat off the shelf PC pricing
16:07:37 <hyc> they can't beat power cost