Post
Topic
Board Mining (Altcoins)
Re: PhoenixMiner 5.4c: fastest Ethereum/Ethash miner with lowest devfee (Win/Linux)
by
Metroid
on 29/12/2020, 15:05:43 UTC
Guys, how much MHs of hashrate should i expect with Phoenix miner for single Gtx 1070 gpu without overclocking and memory pills?

I have an evga gtx 1070 ftw3 and I just tested here for you, it says 29mhs with overclock +110 core, memory +400, power limit 74, in the past as i remember used to be 31mhs with power limit 55. It seems that every dag closer or after 4gb the speed is reduced and reduced. So if for mining, I would not recommend this gpu, for gaming is great, I can play most games at 4k with low or medium visuals, this card is 4 years old, amazing.

It's not quiet right about Nvidia cards speed decrease with every new DAG epoch IMHO. My 1060 and 1080 still showing 24/38 MH/s with claymore in contrast with phoenix miner, (22/36) tested just today.

There is a good explanation why this happens right here, https://bitcointalk.org/index.php?topic=1541084.msg55250689#msg55250689

I talked with nvidia developer with many back and forth messages and the result of the 41 msg conversation is:

Quote
Hi tytanick,

Below is the response from Engineering team -

We’ve confirmed that the performance drop is due to the size of the DAG exceeding the total on-chip TLB capacity on the Pascal GPU. As a result, there is an increased number of TLB misses, which affects performance. Because the TLB is a fixed capacity hardware resource, and the ETH algorithm accesses the DAG randomly, we don’t believe there are any software optimizations that could reduce the TLB miss rate.

In the Volta generation, TLB coverage was increased by 4x, and large DAG sizes (up to ~8GB, which won’t be reached for many years) will still fit in the on-chip TLB. So these newer GPUs (Volta and beyond) will show much less performance sensitivity due to DAG size.