Ram Frequency

pdhenin

pdhenin

pdhenin

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Joined
25 Aug 2011
Posts
216
System:

Mobo: asus p8p67 pro
RAM: Corsair Memory Vengeance Blue 8GB DDR3 1866 Mhz
CPU: i5 2500k
GPU: N560GTX-Ti Twin frozr 2

This might be a stupid question but I have 2x4gb slots of 1866 Mhz RAM but when I look on CPU-z I get the following.

OverclockersRam-1.png


Overclockers2.png


I have got them in slot 2 and 4 as that is what the motherboard manual suggested when I built it. On each slot I am getting 667 MHz I would expect to see each board running at 933 MHz (1866 MHz) is this right or have I missed something somewhere?
 
you have to double the number ddr double data rate,cpu-z always shows memory freq this way,see the last column? xmp-1866 then 933mhz? times it by 2 = 1866mhz so your ram is running at the right speed

did you set to xmp in your bios? it will set everything for you,if not you need to manually set dram speed to 1866 and timings to 9-9-9-24
 
Just changed the BIOS to DDR 3 1866. It now shows as the right DRAM frequency but seemed slow to boot and BSOD on the first load after the change. Might revert it and run some tests on the RAM tomorrow


*Edit* I just changed the BIOS back to Auto and it rates the RAM as 1333MHz. Tried a couple of boots at 1866MHz and only one made it to the desktop*Edit*
 
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set to xmp thats what its there for,it will set the right dram and vccio voltage,or do as you just did but set vccio voltage to 1.15v(might be able to lower,but no higher than 1.2v) and dram voltage to 1.5v
 
I have the same RAM on an MSI P67-GD65 and it's running at 933MHz. I can't tell you how it's set in the mobo without rebooting which I'm not going to do as it's folding but I think I set it manually. I can tell you that the performance increase over 1600MHz is so small it's not worth the extra money. :(
 
if its 1866mhz then it should run at that though? are you setting timings to spec? for example 9-9-9-24? try with max 1.2v vccio and 1.6v dram,if it still blue screens i would call it a day and settle for 1600mhz at stock 1.5v dram and 1.05v vccio voltage
 
(CORSAIR high performance Vengeance memory module 8GB (2x4GB) 1866MHz 9-10-9-27, 1.5V for motherboards using AMD, Intel dual channel processors and upcoming 2nd Generation Intel Core platforms. Vengeance memory modules provide users with outstanding memory performance and stability. Each module is built using carefully selected DRAM to allow excellent overclocking performance, and has a limited lifetime warranty.)

looking at that the timing should be 9-10-9-27 and 1.5v DRAM?
 
That may explain why I'm getting the follow. Even though in the BIOS it is set to 1886MHz and running stable now with correct timings.

CPU1.png

CPU2.png


Even though the Timings show as 936.5 the individual slots run at 667 MHz max
 
pdhenin said:
That may explain why I'm getting the follow. Even though in the BIOS it is set to 1886MHz and running stable now with correct timings.

skip images

Even though the Timings show as 936.5 the individual slots run at 667 MHz max
Click to expand...

The only figure showing the actual speed the RAM is running at is the one under the memory tab so 1873MHz (936.5 x 2).

For stability I suggest you set the Command Rate to 2T not 1T.
 
Thanks everyone looks to be ok now. I updated the BIOS as there had been a memory compatibility update on a newer release. Suppose it also helps to set the timers to the recommended settings as well :D
 
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