hi I have a Gigabyte RX580 Windforce OC Rev 2.0, settings are cclock 1200, cvddc 850, mclock 2015 mvddc 875, currently it's giving me 27 MHs, come times reach 28.

I testes many different configurations but reaching the 30 MHs reported on many post.

Anyone else having this issue or a good config for this card?

Thanks

Hi

Remember the "silicon lottery" even same GPU from same model and brand may have different performance on the field, I have also 3 Sapphire Pulse Rx 5600 XT. With the same settings the have almost same Mhs per second but each one have different power consumption (lower is 92W and arround 45º C, and the other 2 arround 105W and above 55ºC)

So in conclusion, not all the components have the exact same performance, and GT values is one of this specs that will vary from one to another GPU


Regards

Hi all this is my first post ever so be nice  

I have a Sapphire Nitro RX 6800 (Non XT) and I've tested with 5.4c and 5.5b and this are my results:


Hardware

• Mobo: Asrock B450M Steel Legend
• CPU: Ryzen 7 2700x
• Driver: 20.12.1
• GPU: Sapphire Nitro RX 6800

GPU Settings

• Core min Fx: 500
• Core max Fx: 1900
• Core Voltage: 990
• VRAM Fx: 2150
• Fast Timing: Yes
• Power limit: No

First Comments

Running the miner, I saw something that reached my attention, the miner reports that RX 6800 have 30 CUs, when AMD's Specs say the GPU have 60, don't know if this is something normal or is an issue.

Also I checked that no autotunning for this GPU in any Phoenixminer version.

Power consumption with this settings: 134W (In Phoenix miner)


No CUDA driver found
OpenCL driver version: 20.11.3/20.12.1
Available GPUs for mining:
GPU1: AMD Radeon RX 6800 (pcie 9), OpenCL 2.0, 16 GB VRAM, 30 CUs
Eth: Loading pools from epools.txt
Eth: the pool list contains 7 pools (2 from command-line)
Eth: primary pool: ssl://us1.ethermine.org:5555
Starting GPU mining
GPU1: AMD driver 20.12.1
Eth: Connecting to ethash pool ssl://us1.ethermine.org:5555 (proto: QtMiner)
GPU1: 35C 38% 42W
GPUs power: 42.0 W
Eth: Connected to SSL ethash pool us1.ethermine.org:5555 (172.65.218.238)
Listening for CDM remote manager at port 3333 in read-only mode
Eth: New job #fe408bc8 from ssl://us1.ethermine.org:5555; diff: 4000MH
GPU1: Starting up... (0)
GPU1: Generating ethash light cache for epoch #388
Eth: New job #f6263af7 from ssl://us1.ethermine.org:5555; diff: 4000MH
Light cache generated in 2.7 s (23.7 MB/s)
GPU1: Free VRAM: 15.922 GB; used: 0.063 GB
GPU1: Allocating DAG (4.05) GB; good for epoch up to #390
GPU1: Generating DAG for epoch #388
Eth: New job #aba70c1e from ssl://us1.ethermine.org:5555; diff: 4000MH
Eth speed: 0.000 MH/s, shares: 0/0/0, time: 0:00
GPU1: DAG  29%
Eth: New job #f8da09a6 from ssl://us1.ethermine.org:5555; diff: 4000MH
Eth: New job #46690aaa from ssl://us1.ethermine.org:5555; diff: 4000MH
GPU1: DAG  57%
GPU1: DAG  84%
GPU1: DAG generated in 5.7 s (730.2 MB/s)
GPU1: Using Ethash OCL kernels (gfx1030; -clkernel 1)


Mining Results with 5.4c

*** 0:20 *** 1/16 12:21 **************************************
Eth: Mining ETH on ssl://us1.ethermine.org:5555 for 0:20
Eth: Accepted shares 19 (3 stales), rejected shares 0 (0 stales)
Eth: Incorrect shares 0 (0.00%), est. stales percentage 15.79%
Eth: Maximum difficulty of found share: 130.5 GH (!)
Eth: Average speed (5 min): 57.566 MH/s
Eth: Effective speed: 62.35 MH/s; at pool: 62.35 MH/s

Mining Results with 5.5b

*** 1:03 *** 1/16 12:00 **************************************
Eth: Mining ETH on ssl://us1.ethermine.org:5555 for 1:03
Eth: Accepted shares 52 (0 stales), rejected shares 0 (0 stales)
Eth: Incorrect shares 0 (0.00%), est. stales percentage 0.00%
Eth: Maximum difficulty of found share: 1803.1 GH (!)
Eth: Average speed (5 min): 57.687 MH/s
Eth: Effective speed: 54.24 MH/s; at pool: 54.24 MH/s

Almost all the time the average speed is arround 57Mhs in both versions, but for some period it reached up to 64Mhs

*** 0:24 *** 1/16 11:20 **************************************
Eth: Mining ETH on ssl://us1.ethermine.org:5555 for 0:24
Eth speed: 64.588 MH/s, shares: 25/0/0, time: 0:24
Eth: Accepted shares 25 (0 stales), rejected shares 0 (0 stales)
Eth: Incorrect shares 0 (0.00%), est. stales percentage 0.00%
Eth: Maximum difficulty of found share: 183.6 GH (!)
Eth: Average speed (5 min): 64.203 MH/s
Eth: Effective speed: 69.30 MH/s; at pool: 69.30 MH/s


GPU Settings

• Core min Fx: 500
• Core max Fx: 1500
• Core Voltage: 800
• VRAM Fx: 2050
• Fast Timing: Yes
• Power limit: No

With this configuration posted by Phoenixminer, the average speed reains almost the same, arround 58Mhs, but I was no able to see any peak reaching 60+Mhs however, power consumption dropped to: 124W (In Phoenix miner)

Conslusion

• The new version (5.5b) does not seems to improve mining speed
• Using second settings you can have 58Mhs at 124W, which is almost the same than a Rx5700
• If we take the price per MHs, considering the GPU cost, the RX6800 is not profitable at all, at least in my country, I can buy 3 Rx 5600 with the same money and have 120Mhs in average

Questions

• Is the fact that Phonexminer reports only 30Cus actually affecting mining speed?
• I saw videos where SAM in B550 with Ryzen 5000 is having almost 75Mhs, but miner roports double DAG for a single GPU, Is there a way to do the same for hardware out of B550 and Ryzen 5000?
• Any other setting you've tried that have better performance?

Thanks and Regards