Oh, it's a 290x, not a 280x. Should run hotter than a Tahiti, but still, you should replace paste.
Don't worry about ht link speed, high values can actually hinder your performance or cause instability. Just keep it at 2000, or ~2000-2200Mhz when you're using a htt OC.
If you're still at the printscreen settings, you could try to figure if that p95 error is related to imc/ram (lack of vcore usually ends up in a bsod). To isolate it, lower cpu mult to 19.5x, raise cpu_nb to 1.3V just to check if that crash is related to the lowered cpu_nb voltage (those 16GB might require a bit more than I'm used to), if it passes, go to back to 20x, and slowly raise cpu_nb by 0.0125 steps until it stops crashing.
If you keep having problems, depending on CPU 1.425V at 4.0GHz might not be enough to be prime stable, even if it's a common value for a good clocker, it wouldn't be strange if you require ~1.45V. Beware that as you near 1.5V, temperatures and power consumption will raise a lot.
I doubt your ram at 1600 C9 would be the direct cause failing, but if so, try to raise it to 1.55V and/or 2T, in case it's a imc limitation with a big amount of ram. But if possible, you should avoid 2T if you can with only 2 sticks, because of the bandwidth drop.
After everything is stable, there are many things you can do about ram. One is to tighten timings a 1600, maybe up to 1.6V to be safe (if it's micron it can go higher), by going to 8-9-8-27, 8-8-8-27, 7-8-7-24, 7-7-7-24 etc. The other approach is to use a higher base htt (over 240) and lower the cpu mult, ht link mult and ram mult, so you'll go above 1600mhz with more relaxed timings.
When you go this route, using a higher than base htt for the same cpu and cpu_nb speed (242x16.5 instead of 200x200) will result in better performance, but might require a tad more cpu voltage because the cpu works harder. If htt OC is used in combination with CnQ instead of a locked p0 state, you should really set vcore with offset, so that p1,p2... states that will end up overclocked are also running with a higher voltage.
The amount of setting combinations in this platform, and the way they interact can take you some weeks until you find an optimal config.
Edit: You forgot to disable both spread spectrum options, this signal modulation can cause instability under OC.
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Last edited by AlleyViper; 03-01-2019 at 01:19 PM.