Originally Posted by Maddreg
Since Roboyto replied about 2800MHz, please let me know what "Mtps" means
As for the voltage, what is the max safe one for DDR4? I heard that even 1,5v is ok. I still want to try to OC my memory to 3200, but I guess I need to raise timings to up to 20+
Same as 'Mt/s' or 'millions of transitions per second'; remember that DDR memory doesn't actually clock at 2800Mhz.
AMD is commonly referenced when recommending 1.425 volts max for a 24/7 voltage setting with 1.45 max for short duration; I take the 'short duration' thing to mean when stress testing for stability. AMD also seems to think 1.5v is safe during core boosts since that commonly happens with a fully stock 1800X in operation. That said I've read of those who run theirs upwards to 1.5v in an overclock and let it rip so long as temps are reasonably controlled.
The real problem is knowing the true core voltage. Most are reading their motherboard monitor chip and not the CPU core internal telemetry and so 'Vdroop' isn't completely accounted for. In my case, my board shows no droop whatsoever. The VCore reading seems to be directly at the output of the VRM so when it's reading 1.45V actual core voltage could be as low as 1.31V (heavily loaded) if droop is accounted for. That's pretty bad but the effect is if I set Vcore even to 1.45V the actual core voltage will be safely below 1.425 and I still get a nice 3.825G on my R7-1700. It's not hard to see what Gigabyte's idea is here.
Most other boards get a lot closer to the CPU to read the voltage so it reflects at least some of the droop but there's still going to be some safety margin that will protect your CPU from accidental over-volting.
Edit: That is, of course, referring to CPU voltage. If you're referring to DDR4 voltage I run mine at 1.35 volts to get 2993 but a lot of people run at 1.45. I saw a video by BuildZoid (a 'world class, professional overclocker') who claims DDR4 is very over-volt tolerant. He says the only time he's ever heard of someone damaging DDR4 with overvolting they were up around 1.8Volts or so, something crazy high. But that's third hand apocryphal so I wouldn't try 1.6.Edited by buddywh - 8/22/17 at 6:37am