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1866MHz ram running at 933MHz

post #1 of 26
Thread Starter 
Hi Overclockers,

This being my first post i looked around the forums quite a bit but still have not found a solution to my problem.

I have a Corsair Vengeance Red CMZ16GX3M4X1866C9R 16GB (4x4GB) DDR3 kit in my computer.
I have enabled in BIOS for it to run at 1866MHz, however, in CPU-Z it says that it runs at 933MHz. Here is a validation link for CPU-Z: http://valid.x86.fr/j8yafp

I was wondering why its speed is half that of the advertised speed. I'm still not too sure what Quad Channel memory is, could that effect it? Does this effect performance?
I have built around 5 computers before but obviously and always have new things to learn. I'm not too knowledgeable on Memory, so go easy smile.gif

I'd really appreciate some help on this,

Thanks.
Edited by bmxmandan - 4/27/14 at 4:10am
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post #2 of 26
Hi BMXmanDan,

I searched google for the exact same reason as your post as I just built a new computer, and wondered the exact same thing. Here is what I found.

DDR = Double Data Rate So your Ram MHZ Speed is split between your two sticks of ram. Yes you are running at 1866mhz speed ( 933x2 )

I have my 2 sticks of G.Skill Rip Jaw running at 2300 mhz and on CPU-Z it shows 1150 mhz. This is dual channel memory.

If your board is capable of Quad Channel memory, then the total speed would be split by all 4 sticks.

There is a big improvement in total memory bandwidth with quad channel memory. Hence your CPU doesn't have to wait as long for the RAM to catch up.

Needless to say I didn't know this either on my new build, so I've just ordered 4 sticks of Rip Jaws so I can take advantage of this. If anyone is interested in 2 sticks of 8GB (16gb total ) G.Skill Rip Jaw PC3-19200 (2400mhz) (F3-2400C11D-16GXM) Let me know.

Hope this answers your question!
post #3 of 26
Actually you are confusing Double data rate with Dual channel honestbest333 teaching.gif
Quote:
DDR = Double Data Rate So your Ram MHZ Speed is split between your two sticks of ram. Yes you are running at 1866mhz speed ( 933x2 )

Dual channel ^^

Double data rate is going to give you 2 transmissions per clock cycle.thumb.gif
Edited by Arakasi - 4/27/14 at 5:03am
post #4 of 26
Thread Starter 
Hi honestbest333,

Thank you for your speedy post, you have explained a bit but i am still a little confused.

I have a quad channel capable motherboard. If i installed only one memory module (4gb) would that run at 1866? If so how does lowering the clock speed by half if there are two memory modules increase performance?
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post #5 of 26
As far as i know, the dual and quad channel does not effect your frequency nor does it have anything to do with it.
Its meaning is simply stick pairing and the amount of pathways the ram has to travel on, similar to hyper-threading.

You may not be able to plug just 1 stick in. You can try, it might ask for a second in one of the memory banks.

The 900 mhz vs 1800 i suspect is related to your cpu frequency and multi, as well as the ratio on your memory, ie 1:14 ( I would double check you have 1:14 as the ratio, and not something else, cpu-z may be incorrect on what it is detecting. ) smile.gif
post #6 of 26
Thread Starter 
OK Thanks for clearing that up Arakasi,

Just to be clear CPU-Z should show that the ram is running at 1866 per module?
The ratio on my memory is 1:14 so not sure whats happening here.

Ill try and do a bit more research into how memory works and all of its attributes and that might help me solve this.
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post #7 of 26
Quote:
Originally Posted by bmxmandan View Post

OK Thanks for clearing that up Arakasi,

Just to be clear CPU-Z should show that the ram is running at 1866 per module?
The ratio on my memory is 1:14 so not sure whats happening here.

Ill try and do a bit more research into how memory works and all of its attributes and that might help me solve this.

CPU-Z will only show what settings you have set in the bios, it wont necessarily show you 1866 unless you have them set like that and with DDR you will most likely see your 900x2. Which is essentially your 1800, simple because it will send 1 part of data down 1 channel at 900, and the 2nd part down the second channel at 900
which will be the same if not better than sending all down only 1 channel at 1800.

Speed wise or time it takes to finish will be the same 1866x1 or 900x2

Keep in mind you may notice throttling or down-clocking if you have any of the power saving features turned on for your board and cpu in the bios etc.

CPU-z says your ratio is 1:14 but what does it say in the BIOS.

Good luck thumb.gif
Edited by Arakasi - 4/27/14 at 5:47am
post #8 of 26
CPU-z will show the speed one module runs at.
You double it and you have the speed you get in the bios.

Simple, no?
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post #9 of 26
I have 1866 memory in dual channel and it shows 933 mhz in cpu-z too. It is normal.
post #10 of 26
Quote:
Originally Posted by Just a nickname View Post

CPU-z will show the speed one module runs at.
You double it and you have the speed you get in the bios.

Simple, no?

Hi,

His CPU-Z is reporting the following :
Quote:
Type
DDR3-1867 - Quad Channel

Frequency
933.8 MHz (1:14)
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