ga-970a-ds3p and corsair cmz8gx3m2a1866c9 clock frequency problem

[brunobertuno]

hello

I bought a new computer with ga-970a-ds3p and 4 sticks of corsair cmz8gx3m2a1866c9 ( 4 gb each ).
actualy the memory are working at 1333 Mhz instead of 1866 Mhz.
I try to set "profile 1" XMP as explained on page 18 of user's manual, it doesn't start and I receive a system boot failure message.

could you help me in to make memory works at 1866 which is the right clock speed of corsair memory?
regards

* the cpu is amd fx8350

[autotech]

Download cpuz it will show you what timings you have to change and what they will run at. Then go into bios and manually set them see if that works.

I would take them to 1600 with the right timings and reboot. Once you know that it is working restart and change to 1866 with the right timings in bios and see if that works for you.

[Tiger]

I would like to point out two mistakes you are making.

1) cmz8gx3m2a1866c9 is an 8GB kit not a 16GB kit. Mixing memory kits, regardless of brand or model, is not recommended.
 By mixing memory kits together, there may be compatibility issues such as unable to boot or unable to operate at rated specifications.
 XMP settings for one kit aren't applicable to multiple kits.

2) The architecture of AMD AM3+ FX processors supports the use of 1866MHz memory with one DIMM per channel. Using two DIMMs per channel as you are using four DIMMs on a dual channel motherboard supports 1600MHz speed. You would need to overclock the system to run higher memory frequencies.

You might try running at the next lower memory speed and use looser DRAM timings to get your memory to work. The use of multiple kits is not guaranteed to work by the memory manufacturer. Each memory kit is thoroughly tested to ensure compatibility within each memory kit. Because your memory kits have never been tested to work together compatibility cannot be guaranteed.

[brunobertuno]

thanks for answers to you both,
I recapitulate my pc conditions:

cpu amd fx8350
mb ga-970a-ds3p
2 kits of cmz8gx3m2a1866c9 (which means 8 gb for each channel)
os w7 ultimate 64bit
reading your notes I understood that the biggest doubt is the completely memories compatibility.
is that true?

I also downloaded cpuz but as far I understood is only reading the actual pc conditions, isn't it?
or is suggesting the new settings?

I do not like to overclock the system, for my duty I will be happy if the memory system will work minimum at 1600Mhz

[autotech]

It is better to use 1 kit but I have had 2 kits of gskill 1600 at 4 gigs each stick and they ran at 1600 dual channel for 2 years with no problem they now sit in my spare part box....new build.

Cpuz, Memory tab at top tells you what you are running at now. Go to the SPD tab and it will tell you all available timings.  What I do is write down all on the left hand side so I know what to look for in bios then I write down timings. Remember you are running in dual channel so take what it says for speed like 800 or 685  and double it. one on mine says 761 and double that to 1551  another one I get is 800 and so on.


When you go into bios you will have to set memory to manual to be able to change anything. Once you are in bios and look around you will see it is nothing to be scared of. Overclocking is ok for some me I usually buy what I want so no need for it and I have systems that I passed down to kids and upgraded to windows 7 from xp and they are still running today. I like it that way myself.