DDR3 1866 ram running at 1400Mhz?

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LimitedWard

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Dec 15, 2013
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I purchased 8gb of G.Skill Ripjaws X DDR3 1866 memory for my first build because they were on sale for the same price as the 1600 version; however my computer claims that they are running at only 1400Mhz. Is there something I have to do in the bios to get them to run faster?

My mobo is M5A97 R2.0 from Asus which should support up to 1866 without the need to overclock.
 
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Alec Mowat

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Jan 8, 2014
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1400 is a strange number

Did you overclock your system FSB?

You can change the RAM speed from the BIOS. Should be a profile it can grab and use the proper timings, otherwise you'll have to manually set the speed and timings and voltage according to the RAM.
 
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Yingda Wang

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Jan 1, 2014
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did u enable XMP profile in bios?
that should solve the problem
But 1400 is indeed a really weird number :(

I dont recommande u playing with the timings. Just use default settings.
Even professionals dont feel confortable playing with the timing since the first 3 numbers are just the basic-there are a bunch more
Although 1400 vs 1866. unlike u have maybe a haswell i7, u wouldnt really feel the difference unless ur doing synthetic benchmark
 
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LimitedWard

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So on CPU-Z, it says the DRAM Frequency is 722.4 Mhz. I take it I'm supposed to multiply that by two which gives about 1444 Mhz. I will ask Tradesman1 for help on this one. I'd rather not fry my PC, especially since I've only had it a couple of weeks.

Thanks for the tips guys.
 
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LimitedWard

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So I found DOCP in the Ai Tweaker section and selected it. I then chose DDR3-1866 for the DRAM OC Profile, and I changed the memory frequency to auto. I'm now getting around 800Mhz DRAM frequency on CPU-z. That's closer to what I have but still not quite there. Should I explicitly set the memory frequency, or is there something else I should do?
 
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LimitedWard

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So now I've set both the OC Profile and the Memory Frequency to DDR3-1866 and now the DRAM frequency reads 936. I guess for some reason setting the memory frequency to auto makes the ram run at 1600. Is there anything I else I should change to ensure my computer doesn't explode in the next few minutes?
 
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Alec Mowat

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Make sure the CAS timings match the sticker on the RAM, and make sure the RAM voltage matches the RAM. Should be 4 timings (usually like 10-11-10-24)

It's DDR (Double Density RAM), so it read/writes at 936 at the same time (Double), thus 1866.
 
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LimitedWard

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So I checked the bios for DRAM voltage and it came up as 1.5v (as expected); however, the CAS latency was set to 11 and the advertised CAS from G.Skill says 9. What numbers (if any) should I change?

Here's a couple of screenshots:
SUFhzL5.png

RNgfEkR.png
 
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Tradesman1

Tradesman1

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LimitedWard

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Wow that actually makes a lot of sense. Leave it to computer engineers to design something... logical! I will change those numbers over. Thanks for all the help guys :)
 
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Alec Mowat

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If you wanted to overclock your RAM, you can lower these numbers.

If your 1866 RAM is only running at 1600, you can usually get away with lowering these numbers quiet a lot as well.

Lower frequency RAM generally has better timings. For example, my old SDRAM 133Mhz has timings of 2-2-2-10
 
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