PirateKing Posted July 6, 2014 Share Posted July 6, 2014 Hello I purchased 2 packs of CMY16GX3M2A2400C11R thinking I would be able to combine them easily.(32GB) After some researching I hear its not advised to do this? I installed these in my PC, which is built with 4770k Asus Maximus VI Extreme When I turn on the PC, my ram reading is showing only 1333Mhz at 32GB in the bios. I have tried to change the "memory frequency" section to 2400Mhz, but on boot it responds. "memory overclocking failed, press f1 to...." I also readI should perhaps change the timings if I am going to change frequency, but I do not know what the timings should be. I also tried selecting XMP profile, but again on boot it responds the same message. "memory overclocking failed, press f1 to...." Can anybody help? Thanks Link to comment Share on other sites More sharing options...
Synthohol Posted July 6, 2014 Share Posted July 6, 2014 mixing 2 unmatched kits can have this result, thats why its not supported im afraid. see if one kit is better than the other. Link to comment Share on other sites More sharing options...
PirateKing Posted July 6, 2014 Author Share Posted July 6, 2014 mixing 2 unmatched kits can have this result, thats why its not supported im afraid. see if one kit is better than the other. When you say kits, they are atleast the same model series. All CMY16GX3M2A2400C11R When I try 2 sticks at a time from the same pack, the Ram still reads 1333Mhz, this time 16GB respectively. Link to comment Share on other sites More sharing options...
wytnyt Posted July 6, 2014 Share Posted July 6, 2014 have tou tried 2133 or 1866? Link to comment Share on other sites More sharing options...
PirateKing Posted July 6, 2014 Author Share Posted July 6, 2014 have tou tried 2133 or 1866? No, I shall do that and post back Link to comment Share on other sites More sharing options...
wytnyt Posted July 6, 2014 Share Posted July 6, 2014 yes it could be due to your memory controller limitations... Link to comment Share on other sites More sharing options...
HOODedAssault Posted July 6, 2014 Share Posted July 6, 2014 2400mhz can be quite high for some cpu but 4770k should handle it easily with just xmp. Try bumping system agent voltage to +0.1V and see if that helps. Link to comment Share on other sites More sharing options...
jameyscott Posted July 7, 2014 Share Posted July 7, 2014 I would put all the settings in manually. But yeah, you really need a strong IMC to support an overclock on the CPU and high memory. Make sure and read up on some guides about overclocking Haswell because there are voltages that directly affect RAM on the CPU. One of those might be holding you back. (Can't remember off the top of my head since I haven't messed with Haswell in quite a few months...) Link to comment Share on other sites More sharing options...
PirateKing Posted July 7, 2014 Author Share Posted July 7, 2014 yes it could be due to your memory controller limitations... I will check for some option to raise it. As for raising from 1333Mhz, I just managed to boot and stress at 1600Mhz, So atleast some move gained, I will try higher tomo. 2400mhz can be quite high for some cpu but 4770k should handle it easily with just xmp. Try bumping system agent voltage to +0.1V and see if that helps. Ok I will try this, sounds like it could work. I would put all the settings in manually. But yeah, you really need a strong IMC to support an overclock on the CPU and high memory. Make sure and read up on some guides about overclocking Haswell because there are voltages that directly affect RAM on the CPU. One of those might be holding you back. (Can't remember off the top of my head since I haven't messed with Haswell in quite a few months...) What is strong IMC? As for CPU, I managed to OC to 4.6 @ 1.265000V post and stress. I would like to go higher 5Ghz @ 1.4 but I am unsure of the consequences of volting that high. Link to comment Share on other sites More sharing options...
jameyscott Posted July 7, 2014 Share Posted July 7, 2014 The IMC is short hand for integrated memory controller. Depending on the silicon of the chip (silicon lottery!) you chip may or may not be able to handle higher speed memory. This gets even worse when overclocking because there are other voltages at play as well. (VCCIO, VSSCA, etc) Link to comment Share on other sites More sharing options...
PirateKing Posted July 7, 2014 Author Share Posted July 7, 2014 The IMC is short hand for integrated memory controller. Depending on the silicon of the chip (silicon lottery!) you chip may or may not be able to handle higher speed memory. This gets even worse when overclocking because there are other voltages at play as well. (VCCIO, VSSCA, etc) I didn't know that, I thought as it was labelled on the ram package 2400Mhz that's what I would be able to get. Wasted money if I cannot get that. Link to comment Share on other sites More sharing options...
HOODedAssault Posted July 8, 2014 Share Posted July 8, 2014 On 4770k you will get it. It's strong cpu for memory clocking. I have one that's a complete peace of crap amd does 2400mhz no problem. Link to comment Share on other sites More sharing options...
jameyscott Posted July 9, 2014 Share Posted July 9, 2014 I didn't know that, I thought as it was labelled on the ram package 2400Mhz that's what I would be able to get. Wasted money if I cannot get that. I'm not saying you won't get it. It's very unlikely for you not to, but it really depends on how much time you are willing to spend on trying to get it to work. Getting high speed memory to work with a "high" overclock can be difficult, but it's not like it can't be done. One of the best guides I've read and personally used is the one on OCN. Darkwizzie is the guy over there who started it and through is guide (and some luck!) I was able to get 4.7ghz on two different chips. With Haswell, there is just a lot at play voltage wise and unless your motherboard is extremely good at regulating itself, you are going to have to play with voltages quite a bit in order to get what you are trying to do. If anything, you could always go down to 2133 and go with tighter timings! There is an article I read awhile ago about the differences in speed vs latencies and how it all plays in to the actual speed of your system. Basically, it said if you can get 2133mhz @ c9 timings and 2400mhz at c10 timings, they are going to be the about the same actual speed increase. This goes with pretty much all speeds though 2400mhz @ c10 is the same as 2666mhz @ c11, etc etc. You get what I'm saying This isn't true with every program and every generation of processor, because they utilize memory differently, but I hope you get the point. Link to comment Share on other sites More sharing options...
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