Miner settings are standart - 2 threads with 2016 and 1800 intensity.
Vega 56 crashes with 1800 on the second thread. That might explain the hash difference.
Currently doing 1850 H/s with 2016+1600 threads.
I tried 1850 intensity for the second thread, got 2000+ hashrate but soon crashed.
2016+1800 seems stable so far
Is it worth investing in Vega for mining purposes, or should one just stick with AMD RX 580 series.
It depends how much you believe in Monero.
Best card to mine XMR seems to be Vega 56, with 1850 H/s @ 150W for only 399$ (good luck on that price).
Assuming 399 and ignoring power bill, at current monero price each Vega 56 reaches its ROI in 4 months.
A Vega64 (499$) with rednoW's secret improvements, reaches ROI in 5 months, and each next month does $8.41 over Vega 56.
After those 5 months, it will take 11 months (100$ 8.41$) to have Vega 64 netting more income than the Vega 56.
Now... will XMR continue to rise or fall? Some point it as the coin that BTC always wanted to be, and in the Deep Web XMR seems to be more used than BTC.
Ignoring the future of XMR, Vega 56 + XMR is today one of the best GPU/Coin pairs, if not the best, to reach ROI.
I'm new on mining, so feel free to correct me if I'm making no sense somewhere.
I did a test run and RX Vega 56 was getting a 7%-8% reject rate from expired blocks.
So, the profitability is always 8% below the mining calculators and then you have to factor in the inefficiency for pools to doing the hashes, which further reduces mining payouts.
And, I could not get RX Vega 56 above 1300 hashes.
I think it, it is a bold claim to say anyone will be able to make those returns on mining XMR!
I'm only claiming my scenario...
Without power bill, the calculator is telling I should have 0.10 XMR day.
Maybe the pool where I am is just lucky but
7 days ago I started mining at 1400 H/s Vega56. And its pretty easy to have it at 1400 cause it's just stock settings + HBCC on a 2016-8 thread.
Between some resets to apply new testings I improved the hash to 1600, then 1700, then 1800 and now 1850.
The pool already paid me 0.6532229730 XMR and there's already 0.0974204413 XMR due to my shares on latest block.
That's 0.7506434143 XMR, on pair with the calculator.
That's 4 months to ROI (GPUs only), give or take a few weeks depending on XMR price.
edit: as per valid/invalid shares I am with 22,174 valid and 4 invalid.
