G.Skill has launched a new series of memory module kits optimized for Intel’s new 8th Generation Core processors. The new DIMMs belong to G.Skill’s Trident Z and Trident Z RGB families and are guaranteed to operate at 3733 – 4600 MT/s data transfer rates when paired with Intel's Coffee Lake processors. Some of the modules need significantly increased voltages and thus require higher-end motherboards that can deliver “clean” power.

Getting right down to business, the fact that G.Skill even announced memory kits specifically for Coffee Lake got an eyebrow raise out of us. At first blush, it seemed like a marketing stunt, especially since they're using the same Samsung’s B-die chips that they've been using for some time now. But according to the company, Coffee Lake's memory controller behaves ever so slightly differently than Kaby Lake's when overclocked, necessitating the new modules.

Sure enough then, if we compare G.Skill's DDR4-4200 and DDR-4600 modules for the new Coffee Lake/Z370 and the Kaby Lake-X/X299 platforms, we will notice that the modules for Coffee Lake have looser tRAS sub-timings than the modules for Kaby Lake. From performance point of view, tRAS might not be a big deal, but it's an unexpected change; if anything we would have expected Coffee Lake to accept the same timings as Kaby Lake. There are a few possible reasons for this difference - not the least of which is the immature Z370 platform - however the more interesting options are that it's a product of the new manufacturing process, or possibly even a new memory controller entirely (especially seeing as how Coffee Lake doesn't support DDR3).

Otherwise, G.Skill's tinkering only seems to have been necessary for their fastest modules, as their lower-clocked enthusiast-class memory sticks are unchanged from earlier revisions. Conversely, since G.Skill has just loosened the timings of their new high-speed DIMMs, they should continue to work fine in other platforms.

Evolution of Intel DDR4 Memory Controllers for Socketed CPUs
  Haswell-E Skylake Broadwell-E Kaby Lake Skylake-X Coffee Lake
Supported Standards DDR4-2133 DDDR4-2133
DDR4-2400 DDR4-2400
DDR4-2666 DDR4-2666
Number of Channels 4 2 4 2 4 2
DIMMs per Channel 2
Voltages 1.2 V 1.2 V
1.35 V
1.2 V 1.2 V
1.35 V
1.2 V 1.2 V
Launch Timeframe Q3 2014 Q3 2015 Q2 2016 Q1 2017 Q2 2017 Q4 2017

Overall, G.Skill’s lineup of Coffee Lake-optimized DRAM kits consists of seven products featuring two or four 8 GB or 16 GB modules based on Samsung’s B-die chips. The rather broad family of Coffee Lake-optimized memory products is aimed at different classes of systems. The fastest DDR4-4400/4500/4600 DIMMs are only available in 8GB capacities and require 1.4 V, 1.45 V or even 1.5 V. G.Skill positions these modules for enthusiasts seeking maximum performance and not interested in maximizing DRAM content per box. G.Skill’s ‘mid-range’ kits for Coffee Lake run at DDR4-4000/4200, have 32 GB of capacity (16 GB DIMMs), and are designed for those who need high memory bandwidth along with a decent amount of RAM. Finally, there is a 64 GB DDR4-3733 kit for users who run memory-intensive applications.

Traditionally, all the Trident Z modules come with XMP 2.0 SPD profiles to simplify their setup on optimized platforms. In addition, the modules are equipped with G.Skill’s proprietary aluminum heat spreaders. Meanwhile, the Coffee Lake-optimized lineup from G.Skill also includes two Trident Z RGB options with programmable LED lighting.

G.Skill's Trident Z Memory for Intel's Coffee Lake/Z370 Platform
Speed CL Timing Voltage Kit
Family PN
DDR4-3733 CL17 19-19-39 1.35 V 4×16 GB 64 GB Trident Z RGB F4-3733C17Q-64GTZR
DDR4-4000 CL18 19-19-39 4×8 GB 32 GB F4-4000C18Q-32GTZR
CL19 19-19-39 2×16 GB Trident Z F4-4000C19D-32GTZKK
DDR4-4200 CL19 21-21-41 1.4 V 4×8 GB F4-4200C19Q-32GTZKK
DDR4-4266 CL19 23-23-43 4×8 GB Trident Z RGB F4-4266C19Q-32GTZR
DDR4-4400 CL19 19-19-39 2×8 GB 16 GB Trident Z F4-4400C19D-16GTZKK
DDR4-4500 CL19 19-19-39 1.45 V F4-4500C19D-16GTZKK
DDR4-4600 CL19 25-25-45 1.5 V F4-4600C19D-16GTZKK

G.Skill has validated its new memory kits using Intel Z370-based motherboards from ASUS — the ROG Maximus X Hero, ROG Maximus X Apex and the ROG Maximus X Formula.

Finally, G.Skill plans to start selling the new Coffee Lake-optimized Trident Z and Trident Z RGB memory kits in November with the fastest Trident Z RGB DDR4-4266 arriving in December. The company traditionally does not touch upon MSRPs of its products in its announcements because DRAM prices tend to fluctuate. Meanwhile, since we are dealing with the latest products for a premium platform, expect appropriate prices.

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Source: G.Skill

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  • eek2121 - Wednesday, October 18, 2017 - link

    Why do memory manufacturers feel the need to segment their products to a specific platform? Isn't that what standards are for?
  • JoeyJoJo123 - Wednesday, October 18, 2017 - link

    Marketing, I guess. Uninformed or enterprise buyers will think they need Coffee Lake(tm) Approved(c) memory for their Coffee Lake(tm) systems, so they'll pay an arm and a leg extra over, general DDR4 memory (of the same capacity and roughly equivalent latency) without really knowing that it wasn't really necessary.
  • ddriver - Wednesday, October 18, 2017 - link

    Well, zen isn't quite there in terms of MC maturity to support such speeds. So segmentation is kinda inevitable, at least with respect to maximum clocks. Ironically, it benefits significantly more from faster memory than intel.
  • Lolimaster - Wednesday, October 18, 2017 - link

    Ryzen benefitis more from the lowest latency you can get.

    3466 CL14 >>>>>>>>>> 3600 CL16
  • Lolimaster - Wednesday, October 18, 2017 - link

    When you combined both, Ryzen performance scales like a monster.
  • DanNeely - Wednesday, October 18, 2017 - link

    Standards are for standard compliant speeds. Which is JEDEC speeds and timings (max DDR4-3200). Anything faster is out of spec, and the different platforms all have different fastest timings their memory controllers can be pushed to at the higher speeds. You could make a cross platform Dimm whose SPD settings work everywhere, but it would need to have the slowest value for each sub-timing to work everywhere. Doing one per platform lets them push each to its individual limit. As mentioned in the article this batch is coming out because for whatever reason Coffee lake is requiring marginally less aggressive timings than Kaby lake did for stability. Why is an open question, and will probably remain so unless an insider at Intel, the mobo makers, or the dram makers spills the beans.
  • Lolimaster - Wednesday, October 18, 2017 - link

    Why even bother making this high speed chips for coffe lake when they performance gains are minimal vs the huge gains of Ryzen with high speed low latency memory (DDR4 3466 CL14 giving 10-20% extra performance over the already fast for Ryzen DDR4 3200 CL14)

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