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mixing ram of different capacities vs pairing

 
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Fox
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PostPosted: Fri Nov 14, 2014 5:44 pm    Post subject: mixing ram of different capacities vs pairing Reply with quote

I am contemplating the purchase of a 2012 mac mini, which comes with 4 (2x2) gb RAM. An 8 gb stick costs pretty much the same as 2- 4 gb sticks, so my thought is to buy an 8 and install it with one of the 2's it comes with to get 10 gb for the same price as installing 2-4's. Is there any reason I shouldn't do this if I buy this mini? - I want to know now because I may negotiate the RAM with my purchase.
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macmanmacman
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PostPosted: Sat Nov 15, 2014 7:17 pm    Post subject: Reply with quote

you might not have it boot is all try it and find out.

the worse that could happen when you power on the mini is a dong then a beep code if it doesn't like it the question you really need to ask is the ram dual channel or single channel the reason is a single channel DDR won't work with dual channel ram so this would be the only concern
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Glaurung
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PostPosted: Sun Nov 16, 2014 2:00 pm    Post subject: Re: mixing ram of different capacities vs pairing Reply with quote

Fox wrote:
I am contemplating the purchase of a 2012 mac mini, which comes with 4 (2x2) gb RAM. An 8 gb stick costs pretty much the same as 2- 4 gb sticks, so my thought is to buy an 8 and install it with one of the 2's it comes with to get 10 gb for the same price as installing 2-4's. Is there any reason I shouldn't do this if I buy this mini?


Mismatched RAM sticks should work, as long as both sticks are compatible with the system (ie, buy sticks the same speed as Apple uses).

macmanmacman's comment is misinformed -- there's no such thing as dual channel RAM. If you install RAM in matched pairs, then the system will access it using dual channel mode (which is maybe 2% faster in real world terms). If you the exact same RAM as solo sticks or in mismatched sets, then it accesses it in single-channel mode. The theoretical speed boost of dual channel mode is ~30% faster RAM access speed, but that translates to an unnoticeable ~2% for real world performance.
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ez061111
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PostPosted: Mon Nov 17, 2014 12:18 am    Post subject: Reply with quote

I concur with Glaurung.
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macmanmacman
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PostPosted: Sat Nov 22, 2014 12:17 am    Post subject: Reply with quote

Actually there is dual channel ram thank you very much look at dells and other computers for example including alienware which require dual channel memory only single channel won't work the reason i brought up the dual channel ram is because if its single channel and you install dual channel ram you get two errors if you mix and match them.

1. being beep codes

2. the second being the computer drops the rams mhz speed making it work don't get me wrong it does work but your 1 gig stick might only read at 512 megs of ram because of the drop

which is what i stated would happen the only way you can tell is try...
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Fox
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PostPosted: Sat Nov 22, 2014 4:02 am    Post subject: Reply with quote

I ended up buying the 2012 mini and also a 8 gb RAM module. I am using the 8 with one of the 2 gb modules that came with the mini; they are both 1600 and they seem to work well together. If there is a speed penalty, I don't notice it. The 8 cost the same as two 4's but it gives me 10 in total and if I need 16 in the future I can get it without wasting the RAM I just purchased.
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macmanmacman
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PostPosted: Sat Nov 22, 2014 9:51 am    Post subject: Reply with quote

excellent it means you have to at the same mhz speed set awesome glad to hear your upgrade went successful
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DonCarlos
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PostPosted: Tue Jan 13, 2015 9:19 pm    Post subject: Reply with quote

Well I took the Fox leap, and installed a Crucial 8 GB stick, and kept the original 2 GB stick.

Memtest indicated, all is well.

You know there will always be some more questions...

1) Does it matter which stacked slot you put the larger memory in (8 GB) on top slot and 2 GB on bottom slot?

2) Does it matter on "About this Mac" memory pane, if the 8 GB shows up first or second?

Just asking, maybe it makes no difference, I was just wondering if one of the slots is read before the other?
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DonCarlos
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PostPosted: Wed Jan 14, 2015 2:21 am    Post subject: Reply with quote

Does it matter which stick appears first on the About This Mac? Does the order displayed indicate whch memory stick is used first? Or does it matter and am I overthinking this, and the Mac will decide that?

So far everything is functioning pretty snappy (I like this option because then later I only have to get a second 8 GB, and not be concerned about the temporary purchase of two 4 GB).

placing the 8 GB as the top and the first slot of the stack, displays the memory box like this. So at least for the purpose of the display box it reads the bottom or second stick. first, [img[/img]


So then reversing the sticks placing the 8 GB in the bottom or second slot of the stack displays the memory box like this.
[img[/img]
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mooblie
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PostPosted: Wed Jan 14, 2015 5:12 am    Post subject: Reply with quote

My money's on: it makes no difference. Enjoy your 10GB RAM mini! (/slightly jealous!)
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DonCarlos
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PostPosted: Mon Feb 09, 2015 1:36 am    Post subject: As a followup Reply with quote

I thought I would add a follow up, that after a month of using mixed RAM, all is running smoothly.

Very Happy
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-2012 MacMini, i5/2.5 Ghz./16 GB RAM. Samsung 850 EVO SSD (500 GB)
-Late 2007 MacMini C2D/2.0/4 GB RAM.
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Fox
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PostPosted: Mon Feb 09, 2015 6:40 am    Post subject: Reply with quote

Glad to hear, but not surprised. I have no regrets on my unpaired purchase, either.
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Mini 1 (2012): 2.3 ghz Core i7; 16gb RAM, Corsair 240gb SSD, 500gb Seagate XT
Mini 2 (2009): 2.26 ghz Core 2 duo, 8gb RAM, 500gb SSD running Ubuntu
Also a 13" MacBook Air, 21.5" i5 iMac & 11.6" Acer 1810TZ running Ubuntu, openSUSE & Crunchbang
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DonCarlos
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PostPosted: Mon Apr 06, 2015 5:53 pm    Post subject: Reply with quote

Follow up. Well the 8 x 2 gb (10 gb) set has been flawless but alas today o bought a second 8 gb stick so now I am running the full 16 gb. But I wanted to add if you can't afford 16 gb at once then the 8 x 2 gb does work fine
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-Late 2007 MacMini C2D/2.0/4 GB RAM.
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-2006 iMac G5/PowerPC/2 GB RAM
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