Do locked Skylake CPUs take any RAM speed?

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tr_356

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Dec 16, 2015
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I have an Asrock z170m pro4s and i5-6600. I'm looking at 3000mhz ram but then I see stuff like this on Tom's Hardware: "The mobo needs to support the DRAMS data rate but the CPU is the key (specifically the MC in the CPU), i.e. for 2400 - all Z97 mobos will take 2400 sticks (including the Sabertooth which advertises 1866), but to run 2400 (at spec anyway) you will need an appropriate Intel 'K' model CPU. A few non-K might run 2400 with loose timings."

Then in this Techspot article they use 3000mhz ram with an i3-6100. Also, I was talking to someone using 2800mhz ram with an i5-6500.

So is this a bigger issue on Haswell than it is Skylake, and am I fine using 3000mhz with the i5-6600?


Article link: http://www.techspot.com/review/1087-best-value-desktop-cpu/
 
Solution
Tradesman1
Depends on your individual CPU, some 6600(s) will run 3000 fine others won't, if not can try slight increases of voltage to DRAM and/or MC which often does the trick ;)
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tr_356

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Hey man, I was trying this out and could really use some help if you don't mind. I have Corsair LPX DDR4 3000 ram, Asrock z170m pro4s, and an i5-6600 (non-k). I tried XMP 3000 profile and could not boot. My UEFI is showing adjustments for cpu vCore and something called VCCSA voltage (it is set at 1.05v and has one other option for 1.20v). The XMP profile was already giving the ram 1.35v so I doubt that is the problem. The vcore is set to auto and moves from 0.8v to 1.1v while I'm using the computer. I tried taking vcore off auto and moving it to 1.25v but the UEFI is only letting me input integers; I was sitting there with 125v on my screen before quickly hitting backspace a few times. I'm guessing no voltage changes go through until I save/exit or at least hit enter, but that was scary. Basically, I'm unsure of how to change MC and have no idea what this VCCSA voltage is.
 
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tr_356

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Thanks, I'll give it a go with these voltages once I get home. I was looking under "Voltage Configuration," and did not see DDRVTT or CPUVTT, but a baseline suggestion for either may be helpful in case I do locate them. I have the most recent official bios but will flash to the beta that has cpu baseclock-oc to see if these settings were added in that version.
 
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tr_356

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The XMP 3000 profile with 1.4 on DRAM and 1.2 on VCCSA still does not boot. However, manually setting 2800 with 1.25 DRAM and 1.05 VCCSA works, as does 2933 with 1.35 DRAM and 1.20 VCCSA; the timings for both were 14-15-15-40. AIDA64 latency test is showing 53.3ns for 2800 and 51.8 for 2933. Would I be better off taking 2800 at the lower voltage and just trying to optimize the timings from there?

I stress tested the memory with AIDA64 for 10 minutes at 2933 and nothing strange happened, though I am not sure how long it would take to validate it as perfectly stable.
 
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