Have any of you guys played around with editing HBM2 memory timings on linux?
If anyone has a reference V64/V56/FE card with Samsung Mem on linux and is feeling adventurous, could you guys try the following timings?
--rp 10 --rc 45 --rfc 290
Please keep in mind that editing timings can result in damage to your cards.
These timings work for me on my Vega FE, but there's no guarantee they will work for other cards.
In particular, I'm curious what your cn trtl results are. Timings currently have a very limited impact on our other kernels.
any idea on the reason it can damage? heat?
I get 40+ KHs on VII on cn-trtl without the memory mods @ 1450 core and 1295 HBM2.
Well, usually changing timings will only result in memory errors, which will quickly crash the card and nothing particularly bad happens.
But if you screw up the timings badly enough, you can get situations where you have both the dram and the memory controller driving the bus in opposite directions.
Even this will usually not result in damage because both the mem controller and dram have limited drive strength these days, but it still puts more stress on parts then what they are designed for.
Heat is always an issue, and that's just something you have to manage when overclocking anyway.
All of that said, I really don't expect anyone to actually damage their cards, especially not with those timings since I've already tested them on one of my cards.
But just like with any other type of overclocking, I feel it's good for people to know that you can damage components if you go nuts with the values.