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Can you mix RAM? What about same IC? - Page 2

post #11 of 25
Thread Starter 
^ Very interest, thanks. What about laptops and stuff though, where you see 2gb+4gb kits all the time?
Quote:
Sometimes yes, sometimes no. My asrock wouldn't play with my mix matched g.skills at all. My old asus mobo had no problems doing it.

Gee, you wouldn't mind going into a little more depth would you?
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post #12 of 25
When my uncles RAM didnt match on a old laptop - It threw up a MBR error - Swapped out the RAM and it booted first time. I dont risk it with laptops, if something melts etc, it dies.
     
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post #13 of 25
Quote:
Originally Posted by Belial View Post

so what if i ran, like

Channel 1= PSC 2Gb + PSC 2GB
Channel 2 = Micron D9 4GB

?

Or like PSC2GB+PSC2GB // PSC2GB?

I mean you can pretty much mix up DDR3 ram on modern systems with absolute no regard to compatibility these days, right? You will just be limited by the slowest RAM, which would hold true even with 2 sticks of RAM bought from a single 2x2GB kit, right?

I'm guessing there might be a 5 minute headache with initial boot configurations, but that shouldn't be a problem (insert just 1 stick, set bios, then insert all).

If you run three sticks, it will not run in dual channel in the strictest sense. However, Intel has a technology called Flex which allows the matched sticks to run in dual channel while the third stick will run in single channel. To do this, run the matched sticks in the first bank of channel 1 and the first bank of channel 2 and run the unmatched stick in the second bank of channel 1.
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post #14 of 25
Quote:
Originally Posted by Belial View Post

Gee, you wouldn't mind going into a little more depth would you?
Not a whole lot to go into depth there. No matter the settings the ram wouldn't work with my asrock.. where as my asus had no issues.. Sometimes mixing ram is completely fine other times it's not.
post #15 of 25
Thread Starter 
By default, my lenovo laptop came with 2gb+4gb. I was surprised when I cracked it open and saw, but it's quite common on laptops (anything 6gb on a laptop is 2+4).

I'm pretty sure there is no risk of frying components or anything with mixing ram, worst case scenario. I think it's just an issue of boot errors, you just gotta configure the bios before inserting mismatched sets. That what I'm getting so far, the people who had issues aren't really explaining in-depth enough I think to rule out that there was just a software issue they didn't take care of.
Quote:
it's just that getting four modules up to speed is much harder compared to two.

Yes but this has nothing to do with mismatching RAM. You have this same issue with 4 pieces of the exact same RAM. Heck, you have this issue with using 2 sticks of RAM as opposed to just 1. You have to run RAM at the speed of the slowest RAM, just like with SLI/Crossfire being the VRAM of the smaller card, the clocks of the slower card.

And the difference, I believe, you are talking like a single secondary timing reduced, like really insignificant.

And from what I understand, the memory bandwidth of 4 sticks > 2 sticks, even at a slightly lower overclock given that 4 sticks clocks slightly lower generally, kind of thing. Not too sure on that.
Edited by Belial - 3/28/13 at 5:26pm
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post #16 of 25
Thread Starter 
Bump, I'd like to hear more on people who've done this.
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post #17 of 25
Quote:
Originally Posted by xxbassplayerxx View Post

With many motherboards these days, you can even set timings for individual channels/sticks. You could realistically run four sticks, two at 2133 9-11-9 and two at 2400 10-12-12 as long as they'll run at the same voltage, as mentioned above.

Mismatched ram causing errors is a thing of the past on most counts.

agree with this , especially since OP owns UD5 (this mobo have adjustment for each channel so you can pick up appropriate timings to run two different sets )
EDIt : i will try two sets just for you buddy if you want just tell me what you want me to run since i have more then few sticks (RAM should have similar timings SPD )

here it is (Hynix BFR and Samsung HCH9 ,both sets are 2400 running 1.66v)
https://www.dropbox.com/s/ctmjvij8zacia8b/snaphsot0111.png



Uploaded with ImageShack.us

EDIT 2;
i should mention that hynix set is running 9-11-10-28 and samsung 9-11-11-28-MemTweakIt shows timings from colored slots (Hynix) and Maxxmem shows (Samsung ) rolleyes.gif
Edited by coolhandluke41 - 3/31/13 at 1:34pm
    
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post #18 of 25
Thread Starter 
So... you set Channel A(Hynix+Hynix) and Channel B(Samsung+Samsung) right? Why the different timings, is it because the samsungs aren't as fast and you gotta underclock them a bit?

I mean just mix and match, see if you can get anything to NOT work, really. It seems to me that you can run any ram together, with considerations taken for how fast each ram can go. I mean as I understand, all RAM can take up to at least 1.75v, if not 1.9v for 24/7 overclocks, and up to 90*C, so you can make anything work.

I was just curious what doesnt work - like how do you mix different densities, how do you arrange the ram...

Really cool post though luke, thanks.

edit: curious, how do our ram scores compare? Is this a big difference?

Edited by Belial - 3/31/13 at 6:46pm
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post #19 of 25
since i usually run only two sticks i have saved settings under channel B for different sets of RAM (that i don't use ) to save on profiles ,so i just pop in Samsungs bump IMC and VCCIO voltages and she boot it up like nothing ever happen .The timings i'm using are optimized for particular voltage for each set running two banks (basically the settings that work best for the set of RAM => well-done GB thumb.gif )



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post #20 of 25
Thread Starter 
Oh so it has nothing to do with using different ram, it's just the settings you happened to have. So I'm assuming for stability when using more sticks you may have to increase vtt/imc (im currently stable on .05v/.05v less than stock).

So someone had recommended that you run Channel A (1+2) // Channel B (1+2) but you had no problem with Channel A (1+1) // Channel B (2+2). Interesting. basically you can mix any ram, you just might have to do a lot of fiddling to make it work sometimes.
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