exploring crypto twitter is fun: twitter.com/simulxxx/status/1649618696510357505

lol

2m numbers sounds off

buuuuut, i need to find my maths. I think the ratio is even worse

I'd figure it's hard to estimate, you just have to settle on a reasonable average CPU hashrate

tevador: the 1 minute is to generate a suitable v1 which will lead to a valid v2 hash, but what would prevent an attacker from reusing those v1/v2 values over and over again? Unless nodes keep track of valid v1/v2 pairs whose v1s are not valid RandomX hashes the nodes will still perform the heavy RandomX computation right?

they can't reuse old hashes because tevador/RandomX #265/files#diff-495d78c7bd13cc283d13e085a654aa6627d52eb1258e6e6cc14aadb64e559174R410

second Blake2b hash also uses original input which is new every time

Oh ok, should have read the code first! Great!

The number of cpu cores on xmr is probably even higher, around ~5M. But so is the number of asics (2-10M, depending on the generation)

But I would not consider cpu cores and asic devices directly comparable

maybe entire cpus vs asic devices

yes, only Ryzens (starting from Ryzen 3000) can do 1 kh/s per core (running 2 threads)

most Intel CPUs and older Ryzens (1000, 2000 series) can do max 600-700 h/s per core

But Bitcoin's security budget is two orders of magnitude higher: 296 $/s vs 0.8 $/s for xmr

(right now)

energy budget (kWh spent) per $ of emission is higher in xmr

Also, the top tier asic (Bitmain S19 XP and its hydro-cooled variant) should earn ~0.14 $/kWh (going off of the nominal speed and power consumption listed on their side)

due to "free electricity" miners

Yeah, Monero gets a bit more bang for the buck thanks to the lower entry barrier

But the flipside of that is that it's harder for the miners to break even, due to the lower profitability

Right now you'd need 130 H/s/W on randomx to match the 0.14 $/kWh figure

my 7950X can go higher than that if tuned for efficiency

I tested when I bought it

Just the cpu, or at the wall?

16m epyc 7763's to use the equivilent amount of power to that of 845k s19 xp hybrid (18x more devices)

and i dont know current hardware prices, but old numbers had $8600 for epyc 7763 and $19.8k for s19 xp hybrid.

Usig these numbers, the hardware costs for epyc are 18x more expensive than the hw for thr s19 to use use the same mount of power

My script says 1.367M S19 XP Hyd. Asics

That last part might be wrong, rechecking what i did here

these are old nunbers,

"341.66eh"

my numbers were from 215eh

Yeah that checks out

1367/341*215=860

I think last # (hardware cost) is supposed to be 7.6x

merope at the wall

[2022-09-30T18:32:49.453Z] <@sech1> Ryzen 7950X running at 0.85V, 4.3 GHz all core: 18143 h/s, 140 watts at the wall = 129.6 h/J

This was before I tuned memory timings

so it will be more now, and I can save 10 more watts by removing GPU

it can achieve 145-150 h/J

Sweet!

feel free to reply to my tweet with better numbers

poly.cybre.city/notice/AUvOlqlGdkoJNNYLcu for Ryzen 7000 X3D users, 🔥

"ignored AMD's voltage recommendations to stand out from the competition and ended up overheating CPUs and *physically wrapping them*."

also maybe interesting for here chipsandcheese.com/2023/04/23/amds-7950x3d-zen-4-gets-vcache