skylake ddr4 memory voltage question

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kandor

Gawd
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Aug 24, 2005
Messages
632
Hi,

I'm looking for ram for an Asus Sabertooth Z170. Currently looking at these G.skill kits.

I'm confused about whether to buy 1.2 or 1.35 v kits? The G.skill site lists some kits as 'tested' at 1.35 but still lists an SPD of 1.2. The asus mobo manual makes no mention one way or the other.

I'm buying 4x16gb kits (64 total) so I expect to only be able to run it at 2133. But the voltage question is bugging me. I just don't know if it matters?

Thanks!
 
All kits are overclocked 2133MHz ram that have a default voltage of 1.2V for this speed.
To run at the SPD rated speed of say 3000MHz, most need to use 1.35V.
Skylake is fine with 1.35V.
 
Ok, forgetting that last post, I'm down to 2 choices:

cheaper 2400: ($599)
http://www.newegg.ca/Product/Product.aspx?Item=N82E16820231968

slightly better 2800: ($669.00)
http://www.newegg.ca/Product/Product.aspx?Item=N82E16820231946

What I'm wondering I think is a kit tested at 1.35v running say 3200 somehow a better bin than a 1.2v tested at 2400? Does running a 3200kit at 2133 @1.2v translate in any way to better stability or longevity or anything that justifies the higher cost of the faster kit?
 
As someone who has been where you are at, buy the 1.35 kits. I was convinced I needed 1.2 kits but none of them worked properly on my Asus deluxe board or Asus pro gaming board (I have 2 z170 systems). I have been through RMA hell with Corsair and Kingston. Go 1.35 (g skill if at all possible). Just my experience
 
I agree.
I bought Corsair LPX 4x4GB 3000 CL15 and it has been a bit of a pita.
First motherboard worked at 3000 after a BIOS update.
Second motherboard, worked initially at 2800, next bios at 3000, next bios at 2500.

I plan on returning them to the shop but am waiting for them to get stock of GSkill Ripjaws V.
 
If my 4x16 g.skill kit (above) wont post at 2133 for some reason. I'll have to go back and spec an X99 board with an 8x8 kit. So I hope it works out!
 
2133 is the correct speed for both Skylake and Haswell-E CPUs. Anything above this is considered overclocking to the CPU's IMC. Skylake is actually better equipped to handle higher overclocked ram modules, but once you populate more than 2 DIMMs, things change drastically.

I suggest you read this thread before going X99 lest you run into more memory related issues:

http://hardforum.com/showthread.php?t=1881547
 
Thanks for the info. I plan on not overclocking the ram, I just want it to post at 2133. I contacted asus and corsair (even though I bought G.skill) and both said that at 2133 any 4x16 kit should boot even 'without a bios update'. So, I'll find out soon enough if that's true. If not, I'll have to find an 8x8 kit that will boot on an X99.

Thanks,
 
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