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Maximum DDR4 voltage for 24/7

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I had my RAM at 3800MHz CL 16.19.19.19.39 1.4V.
For 4000MHz with same latencies i had to raise it to 1.43V. Is that safe for 24/7 usage?
 
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What is the third (19)?
 
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1.43 is still "fine".

i wouldn't go far above 1.45v for 24/7.
 
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It also depend on what RAM chips are used by the manufacturer of the RAM. I know you don't want to push B-die beyond 1.45-1.5V for daily use (I'm running 1.47V daily)
 
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Intel has certified kits up to 1.55 .... so if ya have one of those... 1.55 is fine.

Recommended up to 3200 ... 1.20
Recommended up to 3600 ... 1.35
Absolute Limit Certified by Intel at DDR4's release = 1.50
Absolute Limit Certified by Intel (last I looked) = 1.55

Check RAM and MoBo manufacturers web forums .... Back in DDR3 days, when everyone was saying 1.50 was the limit despite packaging and SPD stating 1.65, Mushkin said 1.735. Other forum users went had stability as high as 1.94 but were using extreme cooling.

Another way to get some feedback is your BIOS, on my box, as you push higher and higher... the numbers turn yellow (warning) and eventually red (scary).
 
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