IS 1.4v safe for this memory?

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shubham.paul007

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Sep 12, 2017
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i own a crucial ram ddr4 8gb (CT8G4DFD8213) which is rated at 2133 15-15-15-36-51 1.2v
i was able to overclock it to 2933mhz with 14-17-17-44-61 but it wouldnt stabilize below 1.4v ...anything below would bsod.should i be worried or shall i reduce overclock?
 
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Barty1884
1.4V is a bit on the high side IMO.

The DDR4 JEDEC spec took voltages from 1.5v(DDR3) to 1.2V(DDR4),
BUT, interesting, Intel themselves will certify DDR4 as "XMP2.0" provided the voltage is 1.5V or less..... so, at least on Intel controllers,.... it should be "safe"
https://rog.asus.com/forum/showthread.php?51435-Legit-Reviews-What-Is-The-Safe-Voltage-Range-For-DDR4-Memory-Overclocking


The actual module concerns me more than anything though. That's just a bare PCB "budget" DIMM. No heatspreader etc, which may actually result in overheating.
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Barty1884

Barty1884

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1.4V is a bit on the high side IMO.

The DDR4 JEDEC spec took voltages from 1.5v(DDR3) to 1.2V(DDR4),
BUT, interesting, Intel themselves will certify DDR4 as "XMP2.0" provided the voltage is 1.5V or less..... so, at least on Intel controllers,.... it should be "safe"
https://rog.asus.com/forum/showthread.php?51435-Legit-Reviews-What-Is-The-Safe-Voltage-Range-For-DDR4-Memory-Overclocking


The actual module concerns me more than anything though. That's just a bare PCB "budget" DIMM. No heatspreader etc, which may actually result in overheating.
 
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Barty1884

Barty1884

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While Intel's XMP2.0 will certify 1.5V, I can't find much re: RAM voltage from AMD directly.
AMD 'confirmed' (I think it was a Tweet) 1.45V to be the max "safe" voltage for the CPU itself (with appropriate cooling on the CPU/VRMs), but BIOS implementation (and 24/7 usage) would dictate your voltage to the CPU should be lower.

Then, as per GamersNexus, the "actual" voltage going through a chip (vs what software dictates) can be much higher.
https://www.gamersnexus.net/guides/3251-raven-ridge-soc-voltage-guidelines-how-to-kill-cpu-with-safe-voltage


So, on that basis.... and given the DDR4 voltages will directly impact the IMC on the Ryzen CPU.... I'd be inclined to lean towards something like 1.35V* for the RAM/IMC. Pure speculation on my part, admittedly.

*Some of the higher end kits (from 3000-4133MHz) are 1.35V and some appear on vendors QVLs....
https://www.newegg.com/Product/Product.aspx?Item=N82E16820232443
So I'd view that as relatively "safe"

BUT, some of the really high kits, like 4600MHz are 1.5V kits....
https://www.newegg.com/Product/Product.aspx?Item=N82E16820232628

Only verified for Intel platforms though.... don't appeal on QVL's from any AM4 board vendor (that I can find)....

So I'd draw the conclusion that 1.5V is too high for Ryzen to handle..... putting you back to 1.35V as the next lowest "standard", at which voltage, kits exist on some QVLs. Just an assumption of course, not a guarantee.... but I'd say 1.35V is the max.
 
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