You are going to get a lot of "ooh scary scary" responses to this question as they has been a steady stream of them for several CPU generations
"Don't run DDR3 over 1.50 volts, it voids you warranty"... No.. it doesn't, it exceeds the JEDEC specification. back when DDR3 was current, more than half of the RAM kits on Intel's certified compatibility list had a specified voltage > 1.5
"Don't run DDR4 over 1.2 volts, it voids you warranty"... No.. it doesn't, again, it just exceeds the JEDEC specification.
99+% of the specs published and what's written on the RAM package itself refer to the Intel XMP profile ... which by Intel's definition, is overclocked.... If it's overclocked, than it exceeds the JEDEC specification. So when you see OC on a MoBo spec, it's not because the MoBo manufacturer fees it's a higher speed than the MoBo might be able to handle, it's an OC because JEDEC spec says so. Any particular MoBo might or might not support XMP profiles; any particular MoBo might or might not provide support for certain JEDEC profiles. Of course you shouldn't invest in XMP rated or JEDEC RAM sppeds, unless the MoBo BIOS supports that speed ... but remember, BIOSs are sometimes updated to provide just that.
You will not find a set of RAM over 3200 speed which doesn't exceed....over time, as production yields improve, you will ... just as there was a day when to get 1600 on DDR3, you had to be at 1.65
So let's go to the source....
http://www.legitreviews.com/what-is-the-safe-voltage-range-for-ddr4-memory-overclocking_150115
In recent weeks we have received kits that are running Intel XMP 2.0 memory profiles at 1.35V and 1.50V, which are both above the the ‘standard’ according to the JEDEC board .... Legit Reviews contacted Intel about the safe voltage range on DDR4 memory and we received this response.
“1.5v is the absolute max we allow for XMP certifications. However, good DDR4 memory will run at 1.35v up to 3200. Technically, no “safe” (guaranteed) OC over-voltage but 1.35v or lower is best.” – Intel
So, it sounds like Intel suggests a memory kit that uses 1.35V or less and that 1.5V is the absolute max for Intel XMP 2.0 certifications. This is useful information for the community and we pretty sure that we weren’t the only ones that were curious how much power you could throw at the memory kit before the memory controller on the processor would being to get angry.
1.2V or lower = Best for DDR4
1.35V = okay voltage for overclocking kits
1.5V =absolute max voltage allowed for Intel XMP 2.0 profiles and max suggested voltage
If 4 x 8GB on X99 or 16 GB on Z170/Z270, you are guaranteed that that RAM will run at 3200 at the stipulated timings. ... just like you were guaranteed you 6700k would to 4.2 GHZ. But the mean OC on that 6700k was 4.7 Ghz, substantially higher than guaranteed. But with overclocking RAM:
a) You usually won't see anywhere near the same level of % increase
b) The impact of the greater speed has less of an impact on almost all desktop applications.
The best place I have found to get a starting point is the RAM manufacturer's web site forums. Oft staffed by employees, you can oft get good set of numbers that other folks have had success with. Another thing would be to check the Intel Certified compatiblity list and try and find 3466 models from the same manufacturer and try those settings.
Just like every CPU is "the same" but different , same with RAM... one 6700k, might OC to 4.5, most to 4.7 and some to 5.0... but they all came off the same line and have no intended differences.
When a RAM vendor sells RAM, it's tested at the best speed that has a reasonable pass rate for those specific modules ... so a fail at 3466 might turn out to be a pass at 3200... but as higher speeds bring higher prices, demand might be higher for 3200 and RAM that could be sold at 3466 may wind up in a 3200 package. Like any OC, it's all a crapshoot.
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