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Old 10-16-2017, 06:12 PM
osb40000 osb40000 is offline
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Default F4-4133C19D-16GTZKWC Compatibility

I accidentally ordered a set of F4-4133C19D-16GTZKWC thinking it was on the mem support list for the Asrock Z370 Fatality Gaming K6.

The F4-4133C19D-16GTZKW set is what's listed and from what I can tell the difference is it's an older set with slightly looser timing than what I ordered. 19-21-21-41 vs 19-19-19-39.

I still don't have my 8700k yet but don't want to be stuck with memory I can't use past the window to send it back. Ideas from the GSKILL memory gurus?

I had a lot of problems with my 6700k and XMP memory profiles so I'm trying to play it safe this go around.

Thanks!



https://www.newegg.com/Product/Produ...82E16820232469

https://www.asrock.com/mb/Intel/Fata...6/index.us.asp
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Old 10-17-2017, 01:28 PM
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You can definitely use it, but the max frequency will depend on motherboard and CPU. Currently, we have that motherboard rated up to 3866:

https://www.gskill.com/en/configurat...094&model=3118

Timings are slightly looser on one kit, but they are much different components.
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Old 10-17-2017, 02:05 PM
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Interesting, they have GSKILL memory up to 4133 on their memory QVL list. Hopefully it works, if not I can bump it down to 4000 until a new BIOS comes out. Thanks for the response!
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Old 10-17-2017, 02:18 PM
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For DDR4-4000+ you might have to manually adjust some settings, while anything up to 3866 should be fine with XMP auto settings on Z370 (ymmv). However it is usually not a bad idea to tweak timings and voltages for optimal performance and enhanced stability when buying super high frequency kits. Usually VCCIO and VCCSA can be lowered quite a bit vs AUTO settings at DDR4-4000/4133, which also does help with CPU temperatures.
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Old 10-17-2017, 02:47 PM
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Quote:
Originally Posted by emissary42 View Post
For DDR4-4000+ you might have to manually adjust some settings, while anything up to 3866 should be fine with XMP auto settings on Z370 (ymmv). However it is usually not a bad idea to tweak timings and voltages for optimal performance and enhanced stability when buying super high frequency kits. Usually VCCIO and VCCSA can be lowered quite a bit vs AUTO settings at DDR4-4000/4133, which also does help with CPU temperatures.
By any chance do you have a write up or advice on what exactly needs to be tweaked? I'm solid on CPU OC but memory for the most part is new to me.
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Old 10-17-2017, 04:29 PM
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Timings: Only need to be tweaked if you notice abnormal performance like for example low write/copy bandwidth scores. Then usually some of the tertiary timings need to be adjusted from a certain frequency onwards. Just move up memory frequency step by step and watch performance until it degrades, then compare the tertiary timings before and after to identify the possible culprit.

Voltages: To improve stability, mostly means VCCSA and VCCIO. Scaling depends upon the processors IMC quality. Kaby Lake needed between 1.15 and 1.25V VCCSA for DDR4-4000+ and the ASUS boards like my Maximus IX Apex usually need around 50mV less VCCIO than VCCSA.

I don't know if there are any Z370 memory overclocking guides yet, but it is usually only a matter of time. The more general information about memory overclocking from the Z170/Z270 guides is probably still valid, so these might be a good place to start.

If you need more specific help, there is overclocking related forums like http://www.overclock.net for that
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