GDDR5X GPUs still have issues with compatibility. A 1080 for instance will sometimes get the full 30% speed increase over a 1070, but often times it wont. About half the algos worth mining right now have problems with GDDR5X. You'll get anywhere from 10%-30% (usually around 15%). A 1080ti is no different. It's a shitshow, skein doesn't have problems.
why "half the algo", i only have bad result on ETH and feathercoin, all other algo i'm doing 60-70% more versus a 1070, with my 1080ti and 80-90% on skein/jha
You should be getting +30% compared to a 1070 with a 1080 and +85% compared to a 1070 with a 1080ti according to cuda counts and pricing. If you're getting 60-70% more then a 1070 with a 1080 you have something misconfigured with your 1070 as it's underperforming. A 1080 and 1080ti will underperform compared to a 1070, but not the opposite direction unless you have something setup wrong. GDDR5 is quite mature, algos have problems with GDDR5X.
As far as what algos are having problems, you've quoted someone of them. I'm not going to tell you about them though.
i said 70% more than a 1070 with a 1080ti not a 1080, 90% only on jha and skein, i'm not aware of any algo as bad as ETH and feathercoin, for a 1080ti, which i don't care anyway they are far from being the best algo to mine
They aren't 'as bad', Dagger is crippled. There are a couple others, but you're still going to be getting a speed boost, but instead of +85%, you're getting 40-50%.
what are those other bad algo with 50% only, i'm curious, i see that bitcore algo timetravel 10 is another one with 60%, which is not good
Timetravel (8 or 10) is just like x11, almost no ram usage.
If it looks slower on gddr5x, is just because of too low intensity.
Even with higher intensity (which I've already tried) it doesn't run at full speed. Protip, 1070 is also running at too low of intensity, so it doesn't change anything.
Yes it does. The 1070 and 1080 have the same ram size (the 1080ti has a little more, but not enough to increase intensity sensibly), but the 1080 has more cuda cores and slower ram, hence why it needs higher intensity. That doesn't necessarily mean you can take advantage of it, but I know it's true because I tried it myself.
