Ram mixing issue

[Alejandro Rayas]

I have two 4gb gskill ribjaws that are at 1300 i think and i have two corsair vengence 8gb sticks my computer works as long one stick (no matter which is out of the mobo and it doesnt happen at a specific slot) so i wondering is there a way to fix the problem of my computer booting up then shutting down and repeating btw i have a large power supply so i know it's not the power and i know i should have plenty of watts left over for these sticks

 

[bigpinkdragon286]

RAM doesn't usually take gobs of power to run, so I wouldn't even consider that an issue.

However, what is an issue is, mixing disparate RAM modules. This is never guaranteed to work, and is usually only possible when the modules have some sort of common denominator of settings which they will all happily run at.

You don't happen to mention what sort of CPU you're using, so I will mention that another issue that you have to seriously consider is that AMD has a less than stellar memory controller on their FX line of CPUs, with the older Athlon / Phenom II CPUs having a slightly more tolerant version of it. The AMD memory controller is really only suitable for running 2 modules if the modules are dual-rank, or it can handle 4 modules if the modules are single-rank. Unfortunately, most modules of high density DDR3 are dual-rank. Your 8 GB sticks are going to be dual-rank. Single-rank modules are going to be scarce, if they even exist, so it's a safe bet that you're running dual-rank with possible single-rank 4 GB modules. If you're on an AMD system, I would dial back all of the memory settings as far as possible. You can probably get them going at 1333 MHz, but you may have to fall back to 1066 if you can't.

Yes, you can get four modules of dual-rank memory to run on an AMD platform, but I would learn to live with stability issues.

 

[Alejandro Rayas]

I run on a i54690k and on a fatality z97 mobo and it runs fine woth 20gbs at most and also it automatically is sets it self to 1333

 

[Alejandro Rayas]

RAM doesn't usually take gobs of power to run, so I wouldn't even consider that an issue.

However, what is an issue is, mixing disparate RAM modules. This is never guaranteed to work, and is usually only possible when the modules have some sort of common denominator of settings which they will all happily run at.

You don't happen to mention what sort of CPU you're using, so I will mention that another issue that you have to seriously consider is that AMD has a less than stellar memory controller on their FX line of CPUs, with the older Athlon / Phenom II CPUs having a slightly more tolerant version of it. The AMD memory controller is really only suitable for running 2 modules if the modules are dual-rank, or it can handle 4 modules if the modules are single-rank. Unfortunately, most modules of high density DDR3 are dual-rank. Your 8 GB sticks are going to be dual-rank. Single-rank modules are going to be scarce, if they even exist, so it's a safe bet that you're running dual-rank with possible single-rank 4 GB modules. If you're on an AMD system, I would dial back all of the memory settings as far as possible. You can probably get them going at 1333 MHz, but you may have to fall back to 1066 if you can't.

Yes, you can get four modules of dual-rank memory to run on an AMD platform, but I would learn to live with stability issues.

btw it seems to run great with 20gb and i don't see anything bad going on it just bothers me that the last 4gb doesnt wanna play

 

[bigpinkdragon286]

Have you done much in the way of manually tinkering with the RAM settings in BIOS? That's about the best I can offer. Not much more you can do except swap the physical order of the modules as they are installed on the motherboard. I would ensure each pair is in it's corresponding pair of RAM slots. They should be color coded to match. Sometimes they are adjacent one another, some times they are every other slot.

The most ideal solution would be to purchase a matched pair of modules of the final size, or a matched set of four modules that add up to what you're looking to run.

 

[Alejandro Rayas]

I mostly kept everything except the cpu (overclocked) on auto cause i don't want to break anything. Also I have placed the sticks in the right order but the last 4gb stick still just doesnt wanna work with my system.

 

[Tradesman1]

What are the model numbers of the DRAM and what CPU and mobo - we can try some voltage/timing adjustments

 

[Alejandro Rayas]

What are the model numbers of the DRAM and what CPU and mobo - we can try some voltage/timing adjustments

http://www.newegg.com/Product/Product.aspx?Item=N82E16813157501&cm_re=fatality_killer-_-13-157-501-_-Product
mobo^
http://www.newegg.com/Product/Product.aspx?Item=N82E16820233280&cm_re=corsair_vengence-_-20-233-280-_-Product
ram
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231468&cm_re=ripjaws_2133-_-20-231-468-_-Product
ram
http://www.newegg.com/Product/Product.aspx?Item=N82E16819117372&cm_re=i5_4690k-_-19-117-372-_-Product
cpu

 

[Tradesman1]

Very different DRAM, would start with the 1600 sticks and set to 1600 10-10-10-27 set the DRAM voltage to 1.55 and the DDRVTT up + 0.06, save, exit, shutdown and then try adding the 2133 sticks and give it a go