XMP settings are higher than intended.

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Nexus Radical

Nexus Radical

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Jan 29, 2015
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So I've had my Corsair Vengeance 8GB (2 x 4GB) DDR3 1600 Mhz Kit for a while now, and also recently decided to upgrade the capacity. Now I've heard mixing different and even two of the same kits isn't always going to work (well). But i decided that it wouldn't cost me too much to double my capacity if I buy the same kit again, so I did. But here's whats strange. Running the XMP settings seems to but all modules at a frequency of 2200MHz now when using both kits.

(This would be great if i knew things would be okay but recently i have been having problems where applications will bug out and ill get this pixel grid looking thing. But anyway, that's just a side story. Its probably unrelated.)

Continuing. Before hand my single kit would run at 1600MHz as that's the spec i brought. Why could this be happening. The only difference is that the new modules are red. You have the option to choose the color on the amazon page so i suspected they'd be the same model

Here is the link to the kits:
Amazon

Is this just because im mixing kits? I know a guy who is mixing 2x3GB kit and adding a single 2GB and hes having no problems.
 
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Tradesman1

Tradesman1

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In that ad, below where they show colors they show a variety of freqs, may have had a different freq highlighted when you bought, what are the model numbers of the DRAM - should be on a label on the sticks or can look at each stick individually with the free app CPU-Z in the SPD tab to find each sticks part number
 
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Nexus Radical

Nexus Radical

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Sorry, I forgot to refresh my page to see new posts.

Anyway. They both advert running at @1600Mhz. Double checked, however the model numbers are slightly different.

Red Model number.. = CMZ8GX3M2A1600C9R
Black Model number = CMZ8GX3M2A1600C9

But of course they practical the same and guessing that the 'R' at the end stands for Red.

This was on packaging information.

Update

In the SPD for CPU-Z the model numbers for all slots actually turn up all the same. They all turn up as "CMZ8GX3M2A1600C9" Even the red ones dont have the 'R' in the model number.
Just incase you'd like the info:
19a597310a11da40b2d8a871556ad9f2.png
 
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Nexus Radical

Nexus Radical

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Okay I'll give it ago. Instability aren't always present. I'd say about 10-15% of the time they are. But that's bigger than ever for my system anyways.

-Update-

All fine for now. I'll play a few games see if anything goes off. Maybe render a video or something later as a test.
 
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Nexus Radical

Nexus Radical

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Ahh, i see. Okay, so before i was running @2200Mhz as a overclock on my ram. To my surprise i found in some benchmarks it gave me like 5 fps extra some how. Anyway. So yeah, that was active and apparently from turning on XMP, all it did was actually change all the voltages and some of the settings such as RAS to CAS and CAS Latency stuff. Im still confused really but i guess something didn't register so my clocks didn't change just the voltages. Stuff like the CAS Latency were differently changed. Turning on and off my XMP settings doesn't actually do anything weirdly.


Basically or (tl;dr) XMP wasn't changing the clock and kept some of my overclock settings.

What it took for me to realize this was for me to be in the middle of stress testing the RAM and then opening up Intel Extreme tuner. I think it tried to do its auto change to all the clock on my system (RAM, CPU, etc) and thats probably what caused it to crash my system hardcore. I then went into the BIOS to put XMP back on when i then loaded my overclock profile. I then tried to switch on XMP which didn't adjust the core clock. That is when i realized something wasn't right all along.
 
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