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Thank you for some directions. Now it's time to play with that. One question though: I use the GUI. What happens after system restart or gpu crash? Everything stays the same or do i have to apply the values again?

You're welcome.

You have to apply the values again yes. See this as a positive thing ;-)

Cheers!

Thanks to your advice of playing with "tRFC" (along with Timing Level 2 setting) I've got a boost on CN-R, CN waltz and CN soft shell. I've got stable GPUs. What other values are better to change after this 1st step please ? Thanks !

Can you share some of those tRFC settings, it will give me an idea where to start on RX580s.
Thx

All GPUs are RX574

120 for Samsung memory.
125 for weak GPU with Elpida/Hynix
105 (stock value) for my Sapphire ITX (Elpida/Hynix)

EDIT: these are timings for CN Soft Shell (Turtlecoin).

So you pushed your tRFC values up for your RX570's. I thought we were suppose to lower them slowly?

I had 153 and 163 before lowering them

AHH, got it. My values started in the early 200's
Got all cards down to the late 120's before crashing. Thanks for the tips.

Try the same values that people are posting for.vegas these are some good starting points. Not the same numbers of.course for rx's. Try RC and RP RCR etc and just lower a few.
I have some good straps for CN on my RX's but already gained about 3% playing with these.

Fancy posting those values so we have a baseline percentage of how much to reduce each by?