New iMac, Upgraded Ram, But Ram Running @ 1333mhz

[theSeb]

Originally Posted by burninggarlic

Yes, 204 pin and 240 pin really make huge huge difference on price. That is irritating!

Lol. I am not having a good day. You're quite right. It is 240 pin. I am going to shut up now.

[sjz88]

theSeb: Do you have any experience with mixing RAM from different brands? What might happen if you mix let's say the Apple CL11 RAM with the Crucial CL11 RAM? I hope nothing fatal because I think I'm going to take the risk.

[theSeb]

Originally Posted by sjz88

theSeb: Do you have any experience with mixing RAM from different brands? What might happen if you mix let's say the Apple CL11 RAM with the Crucial CL11 RAM? I hope nothing fatal because I think I'm going to take the risk.

Nothing fatal at all. It might simply not work. So the computer might not boot or you may only see half of the capacity. These things are not 100% this way or that way and hence why I use the word "might". In all likelihood it should work, but it does not always work hence why I always include a disclaimer. But to be more specific, there is a higher chance of it working than not working.

[burninggarlic]

Originally Posted by theSeb

Nothing fatal at all. It might simply not work. So the computer might not boot or you may only see half of the capacity. These things are not 100% this way or that way and hence why I use the word "might". In all likelihood it should work, but it does not always work hence why I always include a disclaimer. But to be more specific, there is a higher chance of it working than not working.

That can also really depend on the micron memory modules manufactory.
If the microns come from the same vendor, I would say the brand of RAM does not matter that much.

[dryice589]

If someone is replacing their RAM and has the stock RAM sitting around. PM me.

[Jazwire]

Originally Posted by Jazwire

I am undecided on returning it , or just buying another 16gb as this ram is better than the stock, better timings etc.)
I think I'm better off trying to get the same ram as Apple used (Hynix) if I can though.

Yes the stock ram was CL11, just like the one posted in the picture earlier.

[brock2621]

Originally Posted by theSeb

No. You only need that RAM if you're planning to add it to the stock RAM. And even then mixing different brands is not a good idea. Buy the RAM that you can afford that meets these specifications:

PC3-12800
(1600) DDR3
204-pin
SO-DIMM

It's best to buy the same sticks from the same manufacturer. 1600 MHz CL9 RAM will be faster than 1600 MHz CL10 RAM which will be faster than 1600 MHz CL11 RAM.

The really interesting question is how will the motherboard handle 1866 MHz CL10 RAM.

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You're looking fine, but you could have bought faster RAM. Real world difference? Not something that you would really notice.

Are you referring to latency or actual MHz? Isn't it 1600mhz?

[digitalfailure]

Can I ask a possibly dumb question on this?

If the faster RAM is 1600mhz CL10 and the Apple RAM is 1600Mhz CL11, why does the clock speed drop to 1333Mhz in this situation?

I'd have expected the faster RAM to fit in with the slower speeds of the CL11 RAM

[bflowers]

Originally Posted by dryice589

I will buy someone's apple RAM that they have replaced. PM me.

Strictly speaking, MacRumors frowns on buying and selling on their forum. They probably don't want to get stuck in the middle of a bad deal, or be overrun with Creigslist type adds. That said, people maxing out their machines could PM me too. Can't get a 16GB upgrade past my accountant (wife) after spending $2800 on the computer, but I can do 8G on the side!

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Originally Posted by digitalfailure

Can I ask a possibly dumb question on this?

If the faster RAM is 1600mhz CL10 and the Apple RAM is 1600Mhz CL11, why does the clock speed drop to 1333Mhz in this situation?

I'd have expected the faster RAM to fit in with the slower speeds of the CL11 RAM

I would guess because they are mismatched types, and that messes with the chipset's clock speed. theSeb would know better than me. It might be where those chips can synchronize with each other. Greatest Common Denominator so to speak.

[thekev]

Originally Posted by sjz88

theSeb: Do you have any experience with mixing RAM from different brands? What might happen if you mix let's say the Apple CL11 RAM with the Crucial CL11 RAM? I hope nothing fatal because I think I'm going to take the risk.

Apple doesn't manufacture ram, so it will be ram from one of the major vendors. It could be Crucial ram. Apple claims they test it to spec, and I haven't seen bad stock ram out of the box. With anything I purchase off the net, I test prior to any real computing. It's just safer that way, regardless of what brand you purchase.

[digitalfailure]

That's the confusing part though...... Both memory types have the same clock speed of 1600mhz, so why would a faster stick of ram (CL wise) slow the clock speed down to 1333 ?

[Arman]

I guess to maintain the CL10 timing. Probably a bios preference/ issue to ensure stability.

[bobright]

Originally Posted by theSeb

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[/COLOR]

Edit:

It will work just fine.

Originally Posted by Arman

Checked ifixit website. 21.5 ram is CL11. Assuming for now same us true for 27. Those with Crucial ram upgrade should be good to go.

http://www.ifixit.com/Teardown/iMac+...ardown/11936/3

Thanks Seb, guys so this is C11 and would definitely not underclock with apples RAM right? I'm just double checking as I've bought the wrong memory already. I anybody has it and can confirm please do so.

http://www.amazon.com/Crucial-PC3-12...s=Crucial+16gb

[Arman]

That crucial ram looks to be ok with the apple ram. I would purchase crucial ram from crucials website if u can ( cheaper and direct from source).

[bobright]

Originally Posted by Arman

That crucial ram looks to be ok with the apple ram. I would purchase crucial ram from crucials website if u can ( cheaper and direct from source).

Yeah, the thing is I'm doing a return from my Corsair and used a gift card via amazon. I just hope I can use the one linked above with apples RAM and they can run at 1600Mhz together. Seb and you have said it'd work so I'm taking your guys word.

[dryice589]

Originally Posted by bflowers

Strictly speaking, MacRumors frowns on buying and selling on their forum. They probably don't want to get stuck in the middle of a bad deal, or be overrun with Creigslist type adds.

Sorry, new here. I edited my post. Thanks for letting me know.

[1972]

Originally Posted by Arman

That crucial ram looks to be ok with the apple ram. I would purchase crucial ram from crucials website if u can ( cheaper and direct from source).

Are you running the crucial and apple ram together?

Has anyone else given the crucial and apple together a go?

[sjz88]

Originally Posted by 1972

Are you running the crucial and apple ram together?

Has anyone else given the crucial and apple together a go?

I'm sure many people have in the past since it's been recommended here several times.
If you can wait until monday/tuesdays I will report to you first hand how it works in the new iMac.

[bflowers]

Originally Posted by dryice589

Sorry, new here. I edited my post. Thanks for letting me know.

Actually, I should have included this in my first post, but there is a section specifically for contacting others about buying/selling/trading. I had forgotten about it, as the general rules of the forum discourage it. This way, they can also limit it to one specific spot on the site.

Marketplace is here:
http://forums.macrumors.com/forumdisplay.php?f=132

I went ahead and made a thread for this purpose:
http://forums.macrumors.com/showthread.php?t=1508457

[theSeb]

Originally Posted by thekev

Apple doesn't manufacture ram, so it will be ram from one of the major vendors. It could be Crucial ram. Apple claims they test it to spec, and I haven't seen bad stock ram out of the box. With anything I purchase off the net, I test prior to any real computing. It's just safer that way, regardless of what brand you purchase.

Apple normally uses RAM made by Hynix, but Crucial claims that Apple uses their memory as well...

Crucial is a subsidiary of Micron so it uses Micron memory.

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Originally Posted by bobright

Thanks Seb, guys so this is C11 and would definitely not underclock with apples RAM right? I'm just double checking as I've bought the wrong memory already. I anybody has it and can confirm please do so.

http://www.amazon.com/Crucial-PC3-12...s=Crucial+16gb

Yep, that should be fine in terms of all sticks running at the same frequency (but please don't forget all of my disclaimers )

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Originally Posted by brock2621

Are you referring to latency or actual MHz? Isn't it 1600mhz?

Sorry mate. I am not following you here.

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Originally Posted by digitalfailure

Can I ask a possibly dumb question on this?

If the faster RAM is 1600mhz CL10 and the Apple RAM is 1600Mhz CL11, why does the clock speed drop to 1333Mhz in this situation?

I'd have expected the faster RAM to fit in with the slower speeds of the CL11 RAM

bflowers has basically explained it already.

RAM cannot run at different frequencies and CL. So everything has to drop to something common. 1600 MHz CL10 can normally run at 1333 MHz CL9. We already know that Apple's (Hynix) RAM can run at 1333 MHz CL9. That is the common ground between them and hence why the thread starter is seeing 1333 MHz when he put in all of the different sticks together.

[Arman]

Originally Posted by dryice589

Sorry, new here. I edited my post. Thanks for letting me know.

I think I'm going to pull and sell the apple ram and drop the Corsair CL10 sticks in for 16gb. I'll wait for ddr1600 ram to drop back down in price. Before iMac release it was running around $60.

[thekev]

Originally Posted by theSeb

Apple normally uses RAM made by Hynix, but Crucial claims that Apple uses their memory as well...

Crucial is a subsidiary of Micron so it uses Micron memory.

I know Micron owns Crucial. I just haven't seen any ram with Micron branding in a long time. I don't know if they still sell any under their own name. Apple rebrands whatever they're using, but I didn't know they primarily used Hynix.

[theSeb]

Originally Posted by thekev

I know Micron owns Crucial. I just haven't seen any ram with Micron branding in a long time. I don't know if they still sell any under their own name. Apple rebrands whatever they're using, but I didn't know they primarily used Hynix.

They tend to sell directly to OEMs and phone makers. I am not sure if they even sell anything branded as Micron directly to consumers, since Crucial is apparently "Micron's memory upgrade division".

There was a time when they used Samsung a lot, but ever since they got into a fight with each other over rounded icons and swiping, Apple has been moving away to Hynix.

[bobright]

Thanks Seb for confirming the Crucial RAM should work. I think im going to get this return process going and back goes the Corsair. If anybody gets the Crucial before me and pairs it with Apples factory ram post here on your results.

[studiojackson]

Originally Posted by WilliamG

Good to know. Either way, I'd love to know what's going on here since I'm going to be using this very RAM in my soon-to-be-delivered iMac.

Ny 27 arrived today. When I popped the back (after reading this thread) I expected to see either the top or bottom slots filled. They were staggered.
I just added the memory to the open slots.
Went from 16 to 32 G All humming at 1600 MHz
Good luck.
OWC memory used