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hey guys, got a weird one today.

We built a new mining rig with rx 470 4GB (MSI Gaming X, Samsung memory and yeah, we're lucky enough to have free electricity), we copied the 1500 memory straps from 1500 to 2000 (like we always do), but for some odd reason we can't OC our cards memory above 1850Mhz without having the good old GPU#X got incorrect share etc... which means our cards are stuck around 27.2Mh/s.

You guys got any idea what the problem might be ? We have downvolted anything yet so our cards are definitely not power starved, I'm just a bit confused.

First of all, you have free elec
Even if those cards are doing 15Mh/s youll have good profit...

But ok

What is your config? Win ver., driver ver., etc

Yeah, I'm definitely not complaining about our situation (the rig belongs to me and my brother), I just thought I could squeeze a lil bit more out of our cards since I saw a lot of people having around 30mh/s with the same cards.

So we're using Windows 10 (with the latest update), the latest Claymore version as well and the latest stable AMD drivers (18.12.2). In terms of hardware we are using :

ASrock H81 Pro BTC 2.0
4GB of DDR3
a 1000W Aerocool Gold+ PSU
a Celeron G1840 CPU
and of course 6* MSI Gaming X RX 470@4GB

I managed to slightly increase the memory clock to 1860Mhz but I can't go beyond that.

those cards are bios modded or you are using an afterburner to set the clocks?

Hey and sorry for the late reply (Xmas and stuff!). We tried to things:

1. No bios mod, we simply increased the clocks and we ended up with ~25Mh/s with the clocks around 2050Mhz but with a shit ton of GPU#x got incorrect shares

2. We then bios mod the card ourselves (using Polaris Bios Editor), copying the 1500 strap values from 1500 to 2000. (we also tried with the 1750 values from 1750 to 2000 as well), and this is the situation where we are at at the moment, with 27.2Mh/s and a few GPU errors here and there on our GPU2.

This is our rig stats btw: https://ethermine.org/miners/f6c10F2CB2A2161efb43e4e0eabee60629329d5a/dashboard

Any advices would be much appreciated !

try the driver versions 18.xxxx
and with the compute patcher turn all the gpus in one shot to the compute mode and share if you get better results

We're already on the latest stable driver version, the 18.12.2 with everything on compute mode. We just tried the latest Clayrmore version (12.0), didn't make much difference, still stuck at 27.2mh/s on average with our memory clocks at 1850mhz

Did you read the guide by Mattthev?

https://bitcointalk.org/index.php?topic=1954245.0

Late reply but I actually followed the guide step by step and it just... works !

Went from 1850mhz OC and 27ish mh/s with GPU errors popping here and there to 2100Mhz and 29.1-29.2 mh/s 100% stable so far, with ZERO errors.

Can't go above 2100Mhz since this is the maximum I can get to on afterburner.