Originally Posted by stephen427
So apperently I cannot get my cpu stable anything below 1.242v on 4.2Ghz / 3.8 cache 1.227v. on LLC6 with 1.870VCCIN. Stable as in being able to run for 8 hours, 2 hours aida64 and 2 hours 265X encode and 30 min realbench 2 hours gaming. Do you guys think its worth it going for 4.3Ghz atleast considering im running high voltages already I mean whats the point might not need much more anyway..
These are my settings now. Pretty glad it runs now thought
my board and cpu really needed this exact amount of VVCIN to beable to run these tests for so long. So to anyone else VCCIN plays a HUGE role in stabillity I think.
VCCIN plays a large role in sustained stability. LLC affects idle stability.
The issue is variable load and transient frequency states. The only way to test that is with a video game, or something which causes the core frequency and cache frequency to bounce around. Benchmarks lock
utilisation and/or frequency at 100%. Video games vary load between 0% and 100%, which makes them fantastic stability candidates. This is why some systems fail Prime95 and play games, and vice versa. h.264 is great at testing full load stability, and video games are better at testing variable stability. I haven't seen a single "benchmark" or "stability test" which varies load in the same way that a video game does - but if any of you know of one, please share, cause it'll be really useful. Hence, why GTA V is a pretty good stability test - but not in the ordinary sense of the word.
With a lower LLC, there is VCCIN Vdroop, and if that Vdroop causes VCCIN to droop too much, you will end up failing these 100% load scenarios, as not enough input voltage is being supplied. There are two ways to combat that - either increase the VCCIN or increase LLC. The safer option is to increase VCCIN, but most situations will allow raising LLC to Medium, or a little under 100%. So there is some
VCCIN Vdroop, but not a lot of Vdroop. Vdroop is important as without it, the VCCIN can spike during idle-load states, to way higher than the VCCIN you set in the BIOS, thanks to jpmboy. As to what level of VCCIN is safe? That's up to you. Heck, I have a stable system with only 1.72V of VCCIN, and LLC 6/9, but user situations are entirely different based on the chip being used. While I may need a 1.72V, you may well need 1.87V. And there is nothing wrong with that - as long as you ensure there is enough Vdroop in the VCCIN to prevent these spikes. Most people stick to below 2.00V for regular OCing. Once you've reached the LLC limit, just focus on pushing up the VCCIN. It's safe to run a high idle VCCIN such as 2.00V, but it is not safe to run a high load VCCIN. This is because whilst at idle, a low amount of current and power is being drawn from the system (hence idle), so Voltage won't harm the chip. When you suddenly start loading the chip, current and power load increase massively, so as the load voltage gets higher, it puts a lot more strain on the chip. Beyond 2.00V I wouldn't recommend LLC at all, or only a tiny bit of LLC.
Vdroop - Voltage drop between idle and load voltages.
LLC - Load Line Calibration, affect the Vdroop, by reducing it. Essentially drives more current through the chip when it is loaded; increases the dangerous effect of voltage spikes during idle-load states.Edited by Desolutional - 9/22/15 at 5:32am