Topic: AMD Mem Tweak XL - Read/modify timings/pp/straps on the fly - page 51. (Read 58892 times)

On another note, what's the idea behind increasing values like FAW or REF?

Rx Vega 56 hynix memory  
1250/875mv   916/925mv
tartl cn 20.12 - 20.20  kh/s  L24+24
CN/r   2160   1450/900
60 min no errors.
WinAMDTweak.exe --rcdrd 19 --rcdwr 4 --rc 35 --rp 13 --rrds 4 --rrdl 5 --rfc 148 --REF 15600
Cool!!!

It was said for Polaris cards ))

Dropping RFC from 260 to 250 results in much lower hashrate on pool for my Vega rig.
At least at 1107 MHz HBM clocks on CN_Turtle.

So far I'm quite happy with --CL 16 --RAS 30 --RCDRD 14 --RP 12 --RC 44. Reported pool hash is spot on - and ultimately, that's what matters.

That said, on your (even modded Polaris) GPU, drop RFC for example.. just try it ;-)

Cheers!

@Eliovp, once again thanks for your efforts here getting it onto windows. Much easier for traditional Vega Users with PPTs and Overclocking tools to really test the limits of your tool!

For my part, I'm getting pretty decent results on ETH; Reference Powercolor Vega 64 on latest Adrenalin 19.3.3 drivers.
Thanks to Windward for getting me started on values for parameters.

https://i.imgur.com/6bedvOO.jpg

Given the generosity of Eliovp in even making this tool available, I'm not gonna be the guy that takes and doesn't give back.

For those curious, here's what I put in a batch script after I honed in on parameters.

(PATH to folder where MemTweak is stored)\WinAMDTweak.exe --CL 16 --RAS 30 --RCDRD 14 --RCDWR 14 --RC 44 --RP 14s --RRDS 3 --RRDL 5 --RTP 5 --FAW 20 --CWL 7 --WTRS 4 --WTRL 9 --WR 16 --WRRD 1 --RDWR 19 --REF 17550 --MRD 8 --MOD 15 --PD 8 --CKSRE 10 --CKSRX 10 --RFC 244

Run before starting the miner. For some reason, injecting the timings when mining would crash the miner if FAW>17, but FAW>17 is okay if injected prior. Also, RC<44 led to incorrect shares being found. No guarantees of stability... I was simply looking for accepted shares w/o rejects in short runs. I need to read up as well on compatible RAM timings... lower RC seems to drive HR the most.

Happy to answer any Q's; also, memclock was 1107 and was using PhoenixMiner4.2c
                  

Pleases me to see you guys experimenting and having fun


About GDDR5, it makes no sense to set timings when the GPU isn't fully under load, as it won't work because you'll be setting the timings for the current active memory state, which is like 300Mh..

Ok, i have to admit, there are a decent amount of GDDR5 values in there that you'd better not touch, not exposing them wouldn't help either as you would have no idea what was going on. This also applies to HBM2, although there you can almost change em all without crashing the GPU.

I also noticed some of you already figured out that there are indeed some structures you can follow "RC=RAS+RP , ...."
(doesn't mean that thinking outside of the box won't help (such as bumping REF skyhigh ;-))) If RAS + RP is higher or lower than RC, it's not going to break your gpu..

Dram timings are calculated based on your clocks. That's also why they're not the same as a decoded strap.

Unfortunately, due to the fact that it's not possible to set GDDR5 timings before putting the GPU under load (such as on HBM2), except then in the vbios itself, it is indeed not possible to modify some values.

That said, on your (even modded Polaris) GPU, drop RFC for example.. just try it ;-)

Cheers!

19.4.1 drivers allow you to control and disable (grey) all p-states via ODNT! (except mem p2 voltage)
Just set mem P2 voltage to 800 with softpowerplay ))
https://i.imgur.com/mN2YX7x.png
And make working freq ~1200
Than test stability, than apply timings  -rc 37 --rcdrd 12 --rcdwr 5 --rp 13 --faw 16 --rtp 4 --rrds 3 --rrdl 3 --CWL 6 --WTRS 4 --WTRL 9 --REF 12800

Use --cn_config L22+22 or --cn_config L20+20 for teamred ))

And last but not least - screen of overnight testing no hw errors and h/r on the pool is ok
https://i.imgur.com/p0aowce.png

Wow, with Soft PP or AMD tweaking ?

Great info

why do you need such low gpu clocks if vega is perfectly capable of higher clocks with <800mv voltage?
https://i.imgur.com/8qnLNSB.png
it is vega56 pulse with hynix 20.5kh/s turtle btw
vega56 ref samsung can do the same ...

Alternatively, couldn't you just lock out all other states (e.g. in ODNT or /sys under linux)?  Should force your mem to whatever state you want - w/o an applied load.

About GDDR5, it makes no sense to set timings when the GPU isn't fully under load, as it won't work because you'll be setting the timings for the current active memory state, which is like 300Mh..

why do you need such low gpu clocks if vega is perfectly capable of higher clocks with <800mv voltage?

it is vega56 pulse with hynix 20.5kh/s turtle btw
vega56 ref samsung can do the same ...

Looks good so far. About 1 kh/s boost to turtle. Didn't work with all my hynix tho. Need to figure out what to change to get to work with weaker card.

Edit: after longer time most gpu crash or have hashrate drop

Ethash is even better than cn-trtl wrt being able to drop core clock on vega.  Where you may lose 5+% h/r on trtl by going to cclock p0 (852mhz), I saw zero h/r loss on ethash when doing the same, at least w/ stock timings.  Should allow you to get your voltage down significantly - closer to 800mv.