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Can you mix RAM? What about same IC? - Page 3

post #21 of 25
I'm not certain that this is precisely the kind of feedback that you are hoping for, but my current RIG has provided me with my first experience with mixing RAM and I thought I'd share. I too have always heard the definitive explanation that one can not expect to mix and match RAM sticks with modern DDR 3 MOBOS. Unfortunately, when I bought my first Z77 MOBO (a Maximus V Extreme), I could not get more than 1 stick of RAM to run, no matter the configuration. Turned out it was a faulty MOBO, but before I realized this I managed to buy/trade for a total of 5 Dual Channel Kits. mad.gif So when my lovely Girlfriend surprised me with a brand new Maximus V FormulaTFX, biggrin.gif I very much wished to somehow make use of more than just 1 of these RAM Kits. Turns out that the experts who say you can't mix RAM are... quite right! At least for the most part. Out of all of the possible pairings of my 5 Kits, I was only able to get one such pairing that would both Boot and run at speeds beyond 1600MHz. My Dominator Platinums 2x4GB 2666 CL11, and my G. Skill RipJaws Z 2x4GB 2400 have been happily co-habitating at speeds up to 2600 MHz with very loose timings and 1.78v. But I run them at 2447MHz with 9-12-11-31 CR1 and a Latency Boundary of 5, which on my MOBO is the setting which determines how tight one's tertiary Timings will be and 5 is pretty damn tight! I can manage these settings with 1.75v, and the Bench scores in Apps like AIDA64E are much higher than 2600MHz w/ loose timings. I consider myself to be lucky as hell to have purchased sticks which can mix like this, especially since they use different ICs. They are very stable, and have been by far the easier half of my Overclocking effort with this generation of tech. I hope this is of some use/interest. Be well!
post #22 of 25
Starting with Sandy Bridge Intel introduced a technology called Intel® Flex Memory Access which makes it easier to run different sticks at the same time.
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post #23 of 25
Thread Starter 
Quote:
Originally Posted by johndamon View Post

I'm not certain that this is precisely the kind of feedback that you are hoping for, but my current RIG has provided me with my first experience with mixing RAM and I thought I'd share. I too have always heard the definitive explanation that one can not expect to mix and match RAM sticks with modern DDR 3 MOBOS. Unfortunately, when I bought my first Z77 MOBO (a Maximus V Extreme), I could not get more than 1 stick of RAM to run, no matter the configuration. Turned out it was a faulty MOBO, but before I realized this I managed to buy/trade for a total of 5 Dual Channel Kits. mad.gif So when my lovely Girlfriend surprised me with a brand new Maximus V FormulaTFX, biggrin.gif I very much wished to somehow make use of more than just 1 of these RAM Kits. Turns out that the experts who say you can't mix RAM are... quite right! At least for the most part. Out of all of the possible pairings of my 5 Kits, I was only able to get one such pairing that would both Boot and run at speeds beyond 1600MHz. My Dominator Platinums 2x4GB 2666 CL11, and my G. Skill RipJaws Z 2x4GB 2400 have been happily co-habitating at speeds up to 2600 MHz with very loose timings and 1.78v. But I run them at 2447MHz with 9-12-11-31 CR1 and a Latency Boundary of 5, which on my MOBO is the setting which determines how tight one's tertiary Timings will be and 5 is pretty damn tight! I can manage these settings with 1.75v, and the Bench scores in Apps like AIDA64E are much higher than 2600MHz w/ loose timings. I consider myself to be lucky as hell to have purchased sticks which can mix like this, especially since they use different ICs. They are very stable, and have been by far the easier half of my Overclocking effort with this generation of tech. I hope this is of some use/interest. Be well!

No, I appreciate your input. What RAM ICs are on the ram? Can you be more specific on what didnt work, what you tried to do to make them work, explain a bit mroe about how you got some to boot but then not do more than 1600mhz, etc? Could you set each channel's timings differently, did you try both Channel A (1/2)//B (1/2) and A(1/1) // B(2/2)?
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post #24 of 25
Sorry this reply is a little bit long in coming... My first MOBO, the MVE, gave me the dreaded 55 Q Error code whenever I had more than one stick of RAM installed. I won't go into the details of how/why i ended up buying 5 kits. Suffice to say, I had difficulty looking at the situation completely rationally. I allowed the fact that a MOBO RMA would have sidelined me for weeks to influence my decisions about how to approach the problem. Plus of course, it happens to be a hell of a lot of addictive fun to buy more and more shiny new tech components to play with lol! So the MVE was a bust and I have since RMAed the sucker. When my Girl presented me with the MVF on my Birthday, I started off by trying the two 16GB kits which had been my first two buys. Patriot 1600, and Corsair Vengeance 1600. They did run together, and were stable, though never 1 MHz past 1600 regardless of the Timings. Next I tried the Dominator Platinum 2666 with the Team Extreme 2666. For whatever reason these kits despise one another! With the loosest timings, and 1.85v they would only boot at 1333. I even tried just one stick from each kit... same thing. In fact, the stability in Windows was shaky as hell, despite how slow they were set. The Team Extreme will play with the G. Skill beyond 1333, but not much. I got them to 1866 with meh timings. The Team Extreme on its own is terrific too! When I was testing the limits of the IMCs on my two i7 3770Ks I was able to run the Team Extreme at 3167 or so with my oldest 3770K, and 3200 with my new one. Even my DOMS, which are my best sticks only hit 3000. So I have settled on running the Rip Jaws and the DOMS together under the Rip Jaws secondary XMP3 formula, which I believe is the 100:133 flavor. Its interesting, because in my BIOS the Rip Jaws second XMP3 (BTW the DOMs only show up with 1 XMP3 set of timing numbers) shows a Command Rating of 1 and using this XMP3 has always allowed me to run all four sticks at CR1 with less voltage than even the other Rip Jaw XMP3 formula. They also OC better under this XMP3 and are more stable. I suppose that the only reason my MOBO decided to assign the Rip Jaws XMP3 as the only choice in BIOS is simply because the G. Skills are in A0, B0, while the Corsair sticks are A1, B1. So it was just dumb luck that I happened to set them up this way, but the payoff has been very nice!

John
post #25 of 25
Just realized that I was supposed to actually answer a specific question lol, sorry man! In terms of the ICs involved in my new giant RAM collection, I have only really researched the G. Skill and Corsair sticks. I believe that I had become convinced that the G. Skill were Hynix, and the Corsair Samsung. However, as I'm sure you know one really needs to pop the cap on RAM sticks and actually put one's eyes on the ICs to really be sure and I have not done this. Actually, I take that first part back... There are some really community - minded folks on some of the premium forums like... welll. this one lol who have published lists from time to time. I'm sorry to say I don't have any links for current lists. But I'll try to find out tonight, cuz now I'mthinking I'd like to take advantage of the IC - specific RAM presets that ASUS provided with my MVF BIOS. I'll post again once I figure things out.
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