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Asus p8z68 / Kingston 2400. Won´t run at correct speed?

post #1 of 4
Thread Starter 
Hey,

I just recently got the Kingston HyperX Predator DDR3 2400MHz CL11 (KHX24C11T2K2/8X) (2x4GB). I chose the right xmp profile in the bios but it wont set the memory speed to 2400. When I post it shows ram speed as being 2133. In cpu-z I get this:

http://imgur.com/nmxJYlG,pF3Cern#0

http://imgur.com/nmxJYlG,pF3Cern#1

As far as I can tell this is 2133. WHen I try to set 2400 manually in the bios (still the right xmp profile) it wont post. Any ideas if this is actually 2400, which as far as I can tell it isnt or what I can do to set it right?
Edited by Conditioned - 11/6/13 at 2:07am
post #2 of 4
The maximum Memory Frequency depends on the type of Processor you are running.

Sandy Bridge (2500k/2600k/2700k) has a maximum of 2133MHz, some cant even reach that.

Ivy Bridge has a maximum of 2933MHz what some cant even reach,

Haswell has 2933Mhz+ capabilities.

Edit:
this is just maximum working Memory Multiplier, it is possible to go higher by setting a higher base clock

On p67 / z67 motherboards, the 2400mhz ram setting is for when running a Ivy Bridge CPU
Blazer
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Blazer
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post #3 of 4
Thread Starter 
Thank you for your reply prescotter! Makes sense. By base clock I assume you mean the blk/pcie freq? I tried raising it, and I see the ram increases in hz then, I get a bsod in windows 8 unfortunately. Dont know why I should have error of margins on the rest of my hardware.
post #4 of 4
Its actually not smart to Overclock the baseclock because other devices are also linked to that bus speed.

So if you go to high you might end up corrupting your hard drives etc,

It can give a nice little bump to go to 101 or 102MHz for some memory bandwith benchmarking, but for daily use its not recommended.

My advice is that you run 2133Mhz and try to tighten your timings as far as possible.
Maybe even up the Dram Voltage a little bit to maximize your timings for maximum memory bandwidth.

I see your kit is recommended for 1.5v to 1.65v, So just see how far you can get on 1.65v.
Then you can allways try 1.675v or something but i would not go over 1.7v Dram Voltage 24/7 but i read other people saying its fine.

From what i see on my 2500k, if i run 4.0GHz 1866MHz ram 9-10-9-28 1T i get 23GB/s and with 4.9Ghz same memory speed/timings i get 28GB/s. (These are not the real accurate numbers, but ive tested and this is as close i can remember, just as an example)

So if you can Overclock your CPU you get more CPU performance, More Ram performance = More total performance... hehe cheers.gif
Blazer
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Intel i7 4790K MSI MPower Z97 Gigabyte GTX970 G1 Gaming 4GB Adata XPG 2x8GB DDR3-2600 
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Crucial M500 120GB SSD Samsung 830 128GB SSD Cruscial MX200 250GB SSD WD 1TB HDD 
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Seasonic M12II Evo 750W 
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Blazer
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CPUMotherboardGraphicsRAM
Intel i7 4790K MSI MPower Z97 Gigabyte GTX970 G1 Gaming 4GB Adata XPG 2x8GB DDR3-2600 
Hard DriveHard DriveHard DriveHard Drive
Crucial M500 120GB SSD Samsung 830 128GB SSD Cruscial MX200 250GB SSD WD 1TB HDD 
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Seasonic M12II Evo 750W 
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