Topic: 8 RX580 Hashrate Drop (Read 341 times)

All my changes are being made in the claymore batch file, which are described a few posts back

How are you tuning your cards then? Afterburner? Overdriventool?

Just because HWinfo and Claymore lineup that doesn't mean that your overclocking tool lines up the same way. This is a common tweaking problem but we should be able to fix it by simply identifying which is which.

The GPUS in HWinfo correspond to the GPUS I've designated in claymore by turning each card off 1 at a time and marking the card that stops spinning. All my edits in Claymore line up with the HWinfo information

Are you aware that the GPU id number ordering may not be the same on your miner as compared to your overclocking tool?

Sometimes you notice that tweaking a GPU on your tool will result in different miner output because they don't match. A good way to match cards is to increase the fan speed using your overclocking tool and check your miner which GPU increased in fan speed. Using this method you can piece together which GPUs you are tweaking.

Changed it the best I could and it's 245 MH/S now 3 and 5 show 1-2 errors over last 2 hours and now GPU 6 shows 16. It's like when I edit one card it affects a different card. This has become very frustrating lol


Contrary, the Micron cards are the ones most stable at 32, 3 cards are over 32 and the other 2 are 30. The Samsung and Hynix are the lows at 29. I had thought the same thing. I bought a box of 10 straight from MSI after I already had the Samsung and Hynix and the 5 were nicron and have given me the least problems. I'm tempted to open 3 more from that case (since I have 5 unopened) and just run all micron.

Then I can start a fresh rig with the others, and add 2 other cards I acquired.

You likely will not get 32 mhs stable on the non Samsung cards.

Hey... sounds like you’re getting there.  I’d still lower the mem clock on the two cards getting memory errors, by like 25... I don’t like errors, and it won’t change hashrate that much.  As for overall rig speed, don’t get caught up in trying to squeeze every little bit you can.  Most people say to find the max then back off 5-10%.  You’re equipment will last longer and won’t burn out so soon.  Besides, 245mhs isn’t so bad...

So after some tinkering, these are my results:

Switched to Ethereum Only
Removed -dcri option

Card 2=Samsung
Card 3=Hynix
Card 5=Samsung

-I connected 1 GPU at a time, flashed the original BIOS, removed and reinstalled atipatch.
-Restart.
-Reflash Samsung modded BIOS to each card, achieve 32 MHs each time.
-Same procedure with Hynix memory, except changed BIOS to "One Click" from Polaris.
-No Memory Errrors

-Connect 4 cards (including 1 Micron now) and Memory errors start pouring in with lower hashrate.
-Disable 1 GPU in Claymore at a time, and reference to the # when all 8 are plugged in. Alter voltages and memory, re-enable until no memory errors.
-Copy results over to 8gpu Batch file

-Total Hash 245.8MH/s now, 3 cards @ 32, 2 @ 30, and 3 @ 29.
-1180 Watts at the wall
-GPU5 2 Memory Errors, GPU3 4 Memory Errors in 15 mins

-cclock 1200,1200,1150,1150,1150,1200,1200,1200
-cvddc 900,900,900,900,925,900,900,900
-mvddc 900,900,900,900,925,900,900,900
-mclock 2250,2100,2100,2050,2150,2250,2250,2250

Took a while to wrap my head around 2 cards with the same memory needing different settings, doesn't make much sense to me.

Would REALLY love to get that extra 10-12 MH/s by gettin each card to 32MH/s, but if I spend anymore time on "That damn computer machine" my wife may divorce me  

In my experience, use dummy plug only on igpu (for remote access).  Set igpu as default in mobo bios.

Make sure "above 4g decoding" is set in mobo bios.

Make sure paging file is at least 24GB, the more the better.

I just read back all of OP's post above, seem like all those troubled cards were only down a bit its hashing speed. Have you tried to give dummy output on to that troubled cards?

As you said:

Its can be improper bios mod , or bad undervolting/underclocking.
Try to adjust -cvddc 900 -mvddc 900 a little bit higher
-mclock 2250 a little bit lower ?
What kind of bios mod you have ? paste and copy mem starps ?
8 MSI RX580 Gaming X 8GB (5 Micron, 2 Samsung, 1 Hynix) you can not use the same mem starp mod for all of those cards
Yes you have a power related issue for sure, its maybe not your psu , but the improper way to undervolt your cards, or its can be a bad mem strap mod.
Try to run your cards without any voltage adjustment... just with the bios mod and see your hashrate , you might can not run all 8 cards without undervolting so try 6-7 and see how stable is, how is the hashrate ... i also would remove the -dcri setting from the bat file , and let the miner run on default settings if you mining only ETH

Now that I've switched to Ethereum only, power usage dropped to 1085 watts at the wall, according to the KillAWatt. Rig is in a wide open air conditioned room 30x20ft, plenty of ventiliation and no furniture. They are running cool. I'm no longer convinced it is PSU related.

its can be psu, power related , 8 of those cards can pull way more than 1700 watts , plus your system ...
Read this article about real power usage, this is my own personal experience
If you connecting 6 or 7 cards, then you get a good hashrate ?
If the ambient temp is high where your mining rig located, your cards running hotter , they pulling more power...
What are you using to measuring the power draw at the wall ?
What voltage that rig is running from ?

All set to compute, and update to latest adrenaline 18.5

Have you switched your cards to compute mode? Just in case you forget about that. You are using Adrenalin, right?

What's the best way to go about this? Only leave one plugged in at a time? Using MSI Afterburner to make the adjustments or Claymore parameters. Currently getting my readings from HWinfo. Thanks for your input so far.

Sounds like you need to play with each card individually to get best settings as you should get over 30 on all of them with Eth only.  Does each GPU hold the 1200 core setting, or do they bounce around?  If they drop lower, you may need to increase core voltage for that particular card.

Same hashes as originally stated. 32 on GPU with HDMI, 27-29 on all others. Zero memory errors. I actually dropped card 2,3,5 to 2150 - these are the 2 samsung and 1 Hynix memory cards.

EDIT: Tried changing voltages of other cards and leaving card 2,3,5 at 900 and they go back to abnormal memory errors.

Reduce memory clock on cards 3 & 5 down to 2100 and see what happens.  All cards are not created equal.

That was AMD's cards issue. Sometimes one dummy output was enough to solve that. But in other cases, all of the cards or at least cards that troubled need the dummy output (I experienced on it with my AMD cards).

But may it will a bit different if you were running dual-mining. As other said, doing single mining will be better on your rigs stability.