Question Standard JEDEC vs XMP

Apr 30, 2019
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Hello! I have 2 sticks of memory: Kingston HyperX Fury (16GB, DDR4-2666, timings: 16-18-18-39 @1.2V). If I activate the XMP Profile 1, the frequency, timings and voltage remain the same, being PnP memories. But still! By activating the XMP profile, I’ve seen a tiny improvement in the benchmarks.

Can anyone tell me why?

Is there something else “beneath the surface” besides frequency and timings, that’s being optimized?
 

Darkbreeze

Titan
Moderator
Yes, secondary and tertiary timings. Some of these are set by profile. Some are auto configured by the motherboard UNLESS you manually change them, but typically if they are part of the profile settings they will probably be at least somewhat different than what the motherboard configures them for it if is required to do so.

Overall, you probably wont' see a lot of difference depending on the default settings based on what motherboard and CPU you have. If you had much higher speed memory, then you would see a significant difference as the default 2133-2666mhz + timings would be significantly different than for the XMP 3000mhz + profile.

What is your CPU and motherboard model?
 
Reactions: DMAN999
Apr 30, 2019
47
0
30
0
Yes, secondary and tertiary timings. Some of these are set by profile. Some are auto configured by the motherboard UNLESS you manually change them, but typically if they are part of the profile settings they will probably be at least somewhat different than what the motherboard configures them for it if is required to do so.

Overall, you probably wont' see a lot of difference depending on the default settings based on what motherboard and CPU you have. If you had much higher speed memory, then you would see a significant difference as the default 2133-2666mhz + timings would be significantly different than for the XMP 3000mhz + profile.

What is your CPU and motherboard model?
Motherboard: Gigabyte Z390 Aorus Master rev. 1.0
CPU: Intel i7-9700K (3.6GHz, 8-Cores, 8-Threads)
 

Darkbreeze

Titan
Moderator
So, 2666mhz is the default JEDEC speed for that platform with those components. Enabling XMP on 2666mhz sticks, with that configuration, is probably not going to change much of anything because the profile is already supported by default. Some few settings specific to those particular modules might change based on XMP vs JEDEC but it will not likely be enough to see or notice on anything unless you are being incredibly nit picky with the synthetic benchmarks.

If they were 3000mhz sticks, then you'd probably notice a minor improvement depending on what you were doing. In most cases, even if the XMP profile is the same as what the memory defaults to for that platform, it's usually a good idea to enable the XMP profile anyhow, simply for reasons of stability based on preferred secondary and tertiary timings which can definitely have an affect on stability.
 
Reactions: Endre

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