Re: AMD Mem Tweak - Read/modify mem timings on the fly

Hey everyone,

I started messing with the Tweak tool yesterday, and after a day and half and lots of reading through this thread, I think I've found some good settings.

I have several Polaris (RX4xx/5xx) rigs with flashed timings, but still found that setting

Code:

--REF 30

gave 3-5% increase on both CN/R and ETH on GPUs with Hynix memory. Elpida cards also saw a small increase (2-3%). Samsung with UberMix 3.1 timings did not get much of a benefit (maybe 10h/s on CN/R) and actually showed a few hardware errors in TRM, so I left the default setting on Samsung. Default value on all GPUs was 5.

Important: The setting MUST be applied before mining starts or the value won't change. Even if I closed the miner and tried to apply the setting, it would not take. However, applying via .bat after reboot before the miner started worked great.

Edit: The above method might only apply to older drivers (18.6.1, 18.5.1). It might be possible to change the settings on the fly with newer drivers, but I can't confirm since I'm not using them.

Average CN/R hashrate: 970+h/s. Average ETH hashrate: 29-30+Mh/s

Clocks: 1200 core / 2000 mem (+/- 100 depending on GPU)

System: Win10 (various versions from 1709 to 1903). Driver: 18.6.1 on all rigs
Miners used: Teamredminer v0.5.x, PhoenixMiner 4.2c

I also have one Sapphire Vega56 with Samsung (not flashed, stock bios) that I tested with. Core/Mem settings: 1407/975 @ 905mV. The only parameters I changed were:

Code:

--RAS 26 --RCDRD 12 --RCDWR 7 --RC 36 --RP 10 --REF 15000 --RFC 248

which I adapted from Mashy81's settings here. Thanks.
Below are the rest of the settings showing remaining stock settings:

Quote

Vega 10 XL/XT [Radeon RX Vega 56/64] Memory state: 800MHzMemory: Samsung HBM2
Timing 1 CL: 17 RAS: 26 RCDRD: 12 RCDWR: 7
Timing 2 RCAb (RC): 36 RCPb (RC): 36 RPAb (RP): 10 RPPb (RP): 10
Timing 3 RRDS: 4 RRDL: 5 RTP: 5
Timing 4 FAW: 13
Timing 5 CWL: 6 WTRS: 3 WTRL: 7
Timing 6 WR: 13
Timing 7 RREFD: 7
Timing 8 RDRDDD: 3 RDRDSD: 2 RDRDSC: 1 RDRDSCL: 3
Timing 9 WRWRDD: 3 WRWRSD: 2 WRWRSC: 1 WRWRSCL: 3
Timing 10 WRRD: 1 RDWR: 17
Timing 12 REF: 15000
Timing 13 MRD: 8 MOD: 12
Timing 14 XS: 216
Timing 16 XSMRS: 6
Timing 17 PD: 6 CKSRE: 8 CKSRX: 8
Timing 20 RFCPB: 128 STAG: 7
Timing 21 XP: 6 CPDED: 2 CKE: 6
Timing 22 RDDATA: 16 WRLAT: 4 RDLAT: 14 WRDATA: 1
Timing 23 CKESTAG: 2
RFC Timing RFC: 248

With these settings I was able to get 2130h/s on CN/R (increased from 1980) and 43Mh/s on ETH (increased from 39.5) with the same miners above. Additionally, 2055h/s on CN_Haven.

Apologies if this has been posted in this thread (while I did read a lot, I didn't read every post), but I hope this is helpful for someone else out there.

EDIT: After running for a few hours, I got 1 HW error in TRM. So I changed " --RC 36 --RP 10 " to " --RC 37 --RP 11 ". Hashrate only dropped to 2110h/s. New settings:

Code:

--RAS 26 --RCDRD 12 --RCDWR 7 --RC 37 --RP 11 --REF 15000 --RFC 248

I will update if I make any more changes.