A bit of recreational math: paste.debian.net/hidden/c43e2081

This whole mining operation wasn't really profitable to Bitmain

unless they found really cheap electricity in Hong Kong

hmm, why did I count 44 months

it should be 20 months

anyway, even with 20 months, both mined XMR and spent $$$ will have the same proportion

<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)

we really need to know how expensive the thing is

this would only make sense if they can make then realllll cheap iGuess

<e​ndor00:matrix.org> matrix.monero.social/_matrix/media/…matrix.org/qoqZyIAugoAnWQLpmlhgnucf

<e​ndor00:matrix.org> "There is no official prices from Bitmain but many providers are showing similar prices"

<e​ndor00:matrix.org> Which would mean ~66 H/s/$, compared to ~20 H/s/$ (ish) for a Ryzen rig

<e​ndor00:matrix.org> (assuming ~1000$ for 20 kH/s)

They can dump it for any price, really. It looks more like a firesale for this specific project

<x​fedex:matrix.org> endor00: 1000$ for 20 kH/s? Ryzen 5900X costs €350 on amazon and does 17 kH/s

<e​ndor00:matrix.org> xfedex and what about the rest of the entire rig? :D

<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

<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

<e​ndor00:matrix.org> So on a good day we're looking at ~25 H/s/$ - still less than half

you don't need a decent cpu cooler if you're optimizing for power efficiency

5900X will be using no more than 60 watts

any AMD stock cooler will do

<e​ndor00:matrix.org> But then you're also cutting down on the hashrate, which will reduce your H/s/$ figure, right?

h/s/watt is more important

Like I said, Bitmain can put any price on these devices

for them, it's a scrap that they need to dump

<e​ndor00:matrix.org> Of course, I was just comparing the hashrate cost

<c​trej:matrix.org> How many hashes does a power optimized 5900x do, typically?

<x​fedex:matrix.org> ceetee: xmrig.com/benchmark is your friend

yes but he asking for power optimized

my 3900x somewhat power optimized at 3.8GHz and 1.0125v(?) gets ~14.6Kh/s

<c​trej:matrix.org> with b die?

yes, ram optimized

<c​trej:matrix.org> thanks nioc

yw :)

<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.

if I let my CPU run stock I get similar HR but the cpu power draw is 2x and it runs very hot

<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€)

<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.

<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.

<c​trej:matrix.org> Just trying to put the bitmain thing in perspective with current hardware prices

it seems likely they can beat off the shelf PC pricing

they can't beat power cost