Issue with RAM, XMP, and motherboard

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Corn Philips

Corn Philips

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Sep 7, 2015
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I think I may have made a mistake regarding my RAM and motherboard. I got 16GB of this RAM and installed it in the motherboard, that went fine. The computer recognizes it, boots, runs fine and everything except that in the BIOS it recognizes it as DDR3-1333 instead of the advertised DDR3-2400. So I looked around and found the XMP option which had the advertised speed and matched the information on the stick of RAM. So I selected that and I got a random blue screen two times and another time after turning my computer on all of the lights turned on, the fans started running and then it all just turned off. Since returning all of the settings to auto none of this happened. I'm confused and worried I may have to actually do something about this.

Mobo: http://www.newegg.com/Product/Product.aspx?Item=N82E16813157582
RAM : http://www.newegg.com/Product/Product.aspx?Item=N82E16820231672
 
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Tradesman1

Tradesman1

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Jun 5, 2013
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Think you are going on the assumption (like many) that the mobo determines what DRAM you can run at a given data rate - it plays in byut the true component that defines what you can run is the MC (memory controller) in your CPU. Few AMD CPUs can run 2400 effectively, and of the models that can you fall into the silicon lottery as to if your individual CPU can, i.e. my 8370 can run 2400 fine, but have seen others that even have problems with 2133. What CPU and do you have an OC on it?
 
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Calvin7

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Feb 19, 2013
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AMD FX CPUs support 1866MHz speed with one DIMM per channel or 1600MHz with two DIMMs per channel. Any higher speed memory requires an overclocked system.

The specifications for F3-2400C11D-16GXM list the SPD (Serial Presence Detect) speed at 1333MHz.
http://www.gskill.com/en/product/f3-2400c11d-16gxm

If you read the specifications in your Newegg link, the last line states "To reach rated memory speed, enabling Intel XMP profile or manual BIOS tuning is required".

Returning all of the settings to auto will allow the RAM to run at SPD speed of 1333MHz.
 
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Corn Philips

Corn Philips

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Sep 7, 2015
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Sorry for the late reply. To get it up to 1866 could I just select that in the speed area in the BIOS or is there anything else I have to change?
 
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Calvin7

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Feb 19, 2013
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F3-2400C11D-16GXM
Tested Speed 2400MHz
Tested Latency 11-13-13-31-2N
Tested Voltage 1.65v

You can set:
DRAM Frequency to 1866MHz (page 44 of manual)
DRAM Timing Control (page 45)
The first number here is Cas Latency
Rated 2400MHz is 11-13-13-31-2N so for 1866MHz you can go tighter 9-11-11-28-2N
Your first setting for Cas Latency is 9
then set the next three numbers to 11, 11, and 28
2N is the command rate, or command timing. 1T or 1N is faster but 2N/2T is often more stable. You probably have no need to set this.

You also need to up the DRAM voltage from the stock 1.5v. I think 1.60v should be okay.
Save and Exit BIOS.
 
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