DRAM and NB frequency not lining up

[electroshock777]

Alright, so I'm a bit confused about my RAM speed. As I understand it, DRAM frequency x2 should equal NB frequency. However:

I am running triple channel G.Skill DDR3 RAM rated at 2133Mhz, so the NB frequency seems about right, but then the DRAM frequency is a quarter of that rather than half?
I am a bit of a newb to this so I could be missing something, but could someone please explain if it's supposed to be like this?

 

[Alaric]

What are your system's specs (motherboard, CPU, etc.). If AMD, they have traditonally not had the best memory controller on their chips and the motherboard may just just setting the speed at something it considers "safe". Have you tried setting the speed manually in the BIOS? And does your motherboard support 2133 MHz?

 

[electroshock777]

Asus Rampage III Formula with i7 950. Just checked, my board supports up to 2400Mhz RAM.

 

[Alaric]

Yeah, that shouldn't be a problem with that board. Have you tried setting it to XMP in the BIOS?

 

[electroshock777]

Thanks for the advice. I've tried that, though this still doesn't make sense:

The DRAM frequency seems right, but now the NB also doubled?

 

[EarthDog]

Dram and NB don't need to be double... that said 1000mhz in CPUz is 2000mhz ddr, and if that is true 2000 is half of 4000.

The speed you see now just isn't idle. It ramps up AFAIK.

 

[electroshock777]

Thanks. And just to confirm(as I said I'm a bit of a newb), this isn't damaged my system in any way? Like I'm not overclocking my RAM or anything?

 

[EarthDog]

Doubtful, but No clue. What ram do you have? Since you used xmp, I'd imagine its 2000mhz as that is what xmp set.

Show spd tab from cpuz. It e I'll ll tell you.


Overclocking guide - https://www.overclockers.com/3-step-guide-overclock-core-i3-i5-i7/

 

[electroshock777]

Well this makes no sense to me, but hopefully it does to you:
View attachment 201478
And after changed enabling xmp, windows doesn't see all of my RAM anymore? cpuz still picks up the 12GB, but windows:


Thanks in advance.

 

[EarthDog]

Liekly a reporting error. What does task manager say? Under the performance tab?

 

[electroshock777]

Same. My BIOS also listed usable memory at 8GB.

 

[Alaric]

I would edit that pic and lose your product key from it.

Try reseating the RAM, then test each slot with one stick. Next, test each stick in a known good slot.

 

[electroshock777]

Oppsie, thanks.
The size is fine if I disable xmp?

 

[Alaric]

I would think Windows can't use the 4 GB it can't see, but CPU-Z sees it.
That's odd. And not very helpful, I know. I don't think I've seen that before. You know the old turn-it-off-and-back-on? Maybe try a cold boot instead of a restart?

 

[electroshock777]

No luck I'm afraid. And Speccy isn't helping either:

 

[Alaric]

Maybe someone more familiar with Windows 10 can chime in about whether or not it or some application may have "reserved" 4 GB, making Windows not see it as available.

 

[electroshock777]

Thanks anyway.
Again, what really confuses me is why it's fine with xmp disabled, but as soon as I turn it on, the 4GB just 'disappear.'

 

[EarthDog]

Try restating the memory. Add .05v vtt and for the dram.

 

[UltraTaco]

X58 system needs NB frequency to be **at least** double of ram speed. It can be higher, but not less than double.

4ghz on NB is insane fast. How much voltage do you need to your memory controller? Edit: also having all 6 slots populated puts more strain on memory controller. I can't believe it even works on 4ghz. Did you test it for ataility?

Third channel(4gb) might be disappearing because it's not stable. It happens on mine if I overclock too far.

 

[UltraTaco]

Update to OP.

I just tried running 4ghz Uncore(north bridge, imc, etc) at 1.35vtt and it wouldn't even load up memtest from CD drive. Restart right away.

Next I tried 3.6ghz @1.35vtt. it posted and went successfully into memtest, but after roughly 10 minutes, screen went blank and when I forced restart, I was greeted with default Asus post screen. All settings went into defaults(bios crash?).

I now set uncore 3.5ghz and running memtest to see if it's stable. Voltage is still set to 1.35vtt

Not sure how you are running successfully 4ghz memory controller.. what voltage is it feeding?

Mines
Asue p6t d v1
i7 920
8gb(4gbx2) ram
175x21 CPU 3.6ghz (1.23vcore)