Skylake X Memory Benchmarks

Blackbadger · 17 Sep 2017 at 19:02

Before investing in this platform I am trying to figure out how the memory scaling is on the X299 platform with the new skylake X i9 chips. Which I believe behave differently to the previous gen.

I can't find any benchmarks that compare say 3200 vs 4000 ram etc, and how that effects apps etc.

The only results I can find are for the previous gen.

8 Pack · 18 Sep 2017 at 09:05

Are u talking tuned timings mate or xmp?? I can easily test this quickly on cinebench, terragen amd real bench for example.

For me the order of oc on Intel is always core, then cache then mems. Mem having least benefit.

You could also just buy like the 8Pack 3600mhz c16 kit which can do 4000Mhz c18 no problem then your covered all the way up or tune down 3200c14 and try with your apps.

Blackbadger · 18 Sep 2017 at 11:12

Thankyou for the reply

I was looking at reviews such as https://www.techspot.com/article/1171-ddr4-4000-mhz-performance/page2.html , where massive gains can be had by using faster memory in certain workloads.
Digital foundry also did a limited analysis for games only and had similar ish results. I was hoping some reviewer had done a nice chart showing if SkylakeX with it's different cache layouts, quad channel etc had similar improvements.

I don't know which is best, tuned timings or XMP or faster speed or lower latency. So I honestly don't know if I am talking about tuned or XMP, or at what stage XMP matters or even works.

I'm awaiting your 18core bundles to be honest, so maybe me knowing anything about memory timings maybe a fruitless exercise - you can do all the hard work, so I can enjoy it

.
I have one of your 8Pack OC 6700k bundles and have never been into the bios changing things, other than to apply the OC profile which has been fast & rock solid - Thanks

.

I've seen that there are 4200+mhz kits specifically for skylakeX also, to what point to diminishing returns hit with this platform ? And are those speeds realistically possible?

A couple of comparisons for whatever apps you have different speeds would be appreciated, I suppose terragen would be interesting. And if anyone has seen comprehensive review for SkylakeX and memory performance, please link.

Thanks.

8 Pack · 18 Sep 2017 at 18:38

I will do some comparisons tomorrow. Realistically Imc will limit you above 4K memory speeds and on higher core count even less than 4K memory speeds.

I will do some benches 3200, 3600, 3866Mhz.

The bundle your looking for is ready to go live when the Cpu is launched.

Blackbadger · 19 Sep 2017 at 00:16

Thanks

I also found this information on reddit which maybe of use to people

Only games tested and no application benches. It however does show that memory speed scaling can boost performance significantly on SkylakeX in certain situations.

Now I need to figure out what tRFC and Mesh Frequency is. As raising those speeds appears to have a similar effect to going from 2400 - 4000 ram. Both combined = awesomeness.

To test just how much memory latency affects Skylake-X' gaming performance, I benched 4 games that Skylake-X does poorly against Kaby Lake, using 5 different combinations of RAM and mesh speed!

Test configurations. All games are tested at max settings with MSAA disabled. Civilization VI and GTA V are benched at 1080p, and Far Cry Primal and RotTR are benched at 720p.

For a comparison of how Skylake-X does against Kaby Lake in these 4 games I tested, check TechSpot's review here: https://www.techspot.com/review/1445-core-i7-7800x-vs-7700k/page2.html