Sabertooth Z170 suggested RAM setup

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FireSurfer

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So im about to buy my new rig. I'm going for an Asus Sabertooth Z170 and an i5 6600K and i was researching on DDR4 ram sticks and i have yet to find a conclusive answer to what is best.
At a first glance the board seems like a standard dual channel 4-slot setup; but when i downloaded the manual and scrolled down to the QVL, on every setup it was suggesting 4x4 or 4x8 etc.
Im confused and I don't know if i should get 2 or 4 sticks. If I get 4, I lose the opportunity to upgrade cheaply in the future and that sucks. Any leads?

Thanks

Hector
 
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Tradesman1

Tradesman1

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Any idea how much DRAM you want? 8-16-32GB, etc? It's bast to get the total amount you want in a 2 stick package so you can run dual channel with the least stress on the MC (memory controller) i.e. 2x4GB, 2x8GB, 2x16GB. and only use all 4 slots if maxing out the DRAM to 32 or 64GB. The QVL on the mobo, listing DRAM was made before the mobo was ever released and the buld of the DDR4 that was available was aimed at the X99 mobos which run true quad channel so the majority the mobo makers have in their labs is 4 stick sets. Best I've found on the Z170/1151 platform ar the Trident Z and Ripjaws V lines from GSkill.
 
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bmcelvan

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I'm curious about this as well as I've seen people saying this board doesn't work well with higher bandwidth rams.

Question, If I was to get 32gb (2 x 16gb) G.Skill Ripjaws V 2800or3000mHz CAS14, is there a possibility that these won't even run at 2133 /2400 and/or be detected by the system? Anything in this range is not listed on the QVL (becasue of reasons Tradesman already stated I believe).

I asked NewEgg and they said any open package that is not defective has a re-stock fee. If I installed these and the mobo won't even post (can you change bios before post?) with XMP turned off, would you consider that defective or simply not compatible?

I'm not sure if these are plug and play but it seems most chips at this range are PnP, would I even be able to get the machine to turn off XMP or does PnP skip XMP.

I'm gonna call G.skill Monday (hopefully they pick up) because they don't even list this mobo on their memory finder section. They have literally every other asus z170 board. I'm wondering if this board "works" like a different board and can use that recommendation.

Thanks

Ben
 
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Tradesman1

Tradesman1

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They should go to the mobos default of 2133....but....there's always a but, the ST is aimed more towards a workstation type build rather than the enthusiast level so DRAM updates aren't popped in as fast (note they list DRAM compatibility at 2133-2400 rather than a typical 2133-3000+ on most Z170 mobos.....this has long been true w/ the ST mobos, other editions 1155, 1150 even AMD typically showed max DRAM at 1866 where comparable mobos were 2666-3000+
 
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bmcelvan

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Pretty much all the "professional" review sites when reviewing this board were able to get 3200, 3466 speeds. Obviously they are professional so know all the ins and outs of tweaking to get them to work.

With that said, if they don't show, or it won't boot for me, I can still access the bios, correct? I can use the XMP profile and tweak them thru the bios...or is there a chance they won't even show up in the bios, and if that is/was the case, how would any pro get them to work?

Lastly, I've gotten confused about RAM and some of its specs. According to wikipedia DDR4 2400 PC4-19200 has a clock speed of 300MHz and a transfer rate of 2400 MT/s. I frequently see descriptions like this one below:

http://www.amazon.com/Corsair-Vengeance%C2%AE-2400MHz-PC4-19200-Memory/dp/B00S51XM5Q/ref=sr_1_2?s=pc&ie=UTF8&qid=1452535023&sr=1-2&keywords=pc4+19200

Am I missing something or is it really 2400MHz?

thx

Ben
 
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bmcelvan

bmcelvan

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Thanks for info. Finally got a "livechat" thru the newegg website for a particular G.Skill set of RAM with a certified G.Skill rep (and also emails from G.Skill tech support) stating that chips up to 3200, up to 64gb (4 x 16gb) and including 32gb (2 x 16gb) up to CL14 should work on this board. Whether that happens we'll see, and I'll let you know.

Another question, if given the choice between: both 32gb (2 x 16gb) and the same price, 14-14-14-34, 3000 and 15-15-15-35, 3200, should go with the 3200 right as it has a higher clock and the cycle time is virtually identical, right?

14-14-14-34@3000--> 14/(1500*1000) = 9.333 ns
15-15-15-35@3200--> 15/(1600*1000) = 9.375 ns
 
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