North Bridge Frequency not adjusting to load in CPU-Z after XMP is turned ON

[xStampede]

I just bought a new comp and the motherboard runs my 1866Mhz RAM at 1333Mhz by default.

CPU: i7 4790
Motherboard: Asus H97M-E (http://www.asus.com/Motherboards/H97ME/)
RAM: Crucial BLT2CP4G3D1869DT1TX0CEU Tactical 8GB Kit (4GBx2) (http://www.amazon.co.uk/Crucial-BLT2CP4G3D1869DT1TX0CEU-Ballistix-DDR3-1866-PC3-14900/dp/B0069OG1RM/ref=cm_cr_pr_product_top)

CPU-Z validation(idle): http://valid.x86.fr/j74bms

Picture of CPU-Z SPD:

At default 1333Mhz Ram the north bridge frequency in CPU-Z is variable depending on load from 300Mhz up to 3700Mhz, after i turn XMP profile on the ram is set to 1600Mhz, CPU-Z shows NR frequency locked at 3991Mhz, why isn't it adjusting according to load like at default 1333Mhz?

I set the ram back to default cause im afraid to damage the motherboard if NR frequency is that high, i have no experience with north bridge so im might be panicking for no reason, can someone help me and point me into the right direction?

 

[ingtar33]

because it's overclocked ram, that's being sold at it's overclock speeds, with no XMP profile for it. My gskill ram is the same way... it's XMP profile is for 1333 11-11-11-31 ram... but it was sold as 1600 9-9-9-24 ram. Well, my ram works fine at 1600 9-9-9-24 timings... but i have to input those timings by hand.

you'll need to load into your bios and manually set your ram to it's proper timings and speed. which is 1866 9-9-9-27

 

[xStampede]

because it's overclocked ram, that's being sold at it's overclock speeds, with no XMP profile for it. My gskill ram is the same way... it's XMP profile is for 1333 11-11-11-31 ram... but it was sold as 1600 9-9-9-24 ram. Well, my ram works fine at 1600 9-9-9-24 timings... but i have to input those timings by hand.

you'll need to load into your bios and manually set your ram to it's proper timings and speed. which is 1866 9-9-9-27

The motherboard has a limit on 1600Mhz, that's why when i set XMP profile it sets to 1600Mhz instead of 1866Mhz, anyway what about the NR frequency, why it shows constant 3991Mhz after i set XMP on? Shouldn't it be variable according to load like it is when i have all on Auto(default)?

 

[ingtar33]

I should have paid attention to your motherboard. yeah... you're sorta stuck with that "H" chipset.

NR frequency? you mean the core speed right?