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

[RoyaleConQueso]

I'll add my comments to the archives here for future 2012 iMac owners. Basically nothing new to add. Mixed the two and got 1333 MHz and then took out the Apple mem and got 1600 MHz.

With both:

http://i.imgur.com/6EKQi.png

With just the Corsair:

http://imgur.com/a/CN8sM#um1LT

 

[ttytt]

Really interesting thread, and I've learned quite a bit in advance of my 27" iMac purchase. I'm certainly going to go down the DIY road with the RAM and I've spotted this pretty good set. Can someone help me out though with something - I can't seem to find if it's 204 or 240 pin. The comments all relate to MBP's. Will I be able to use it in an iMac?

http://www.amazon.co.uk/gp/product/B0076W9Q5A/ref=ox_sc_act_title_1?ie=UTF8&smid=A3P5ROKL5A1OLE

 

[Fiete5401]

Can someone help me out though with something - I can't seem to find if it's 204 or 240 pin. The comments all relate to MBP's. Will I be able to use it in an iMac?

http://www.amazon.co.uk/gp/product/B0076W9Q5A/ref=ox_sc_act_title_1?ie=UTF8&smid=A3P5ROKL5A1OLE

Correct me if I'm wrong but I think that DDR3 SO-DIMMs always have 204 pins.
Should be no problem to install in an iMac.

 

[iAco]

Yes the Corsair alone does run at 1600mhz, its only when I mix it with the stock ram it under clocks to 1333.

So if you are going to run 32GB of the Corsair, I would suspect you will be fine.

I was going through this thread because I was curies if this RAM

http://www.newegg.com/Product/Product.aspx?Item=N82E16820148609

Would work in the new iMac 27. That's 2x8GB in Dual Channel. 2 sets of those should give me 32GB, 2 sets of 16GB in dual channel. Right?

Oh and I also wanted to say that you just max out on everything Apple (*your signature*)!!!

 

[iAco]

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[scubadoo]

I was going through this thread because I was curies if this RAM

http://www.newegg.com/Product/Product.aspx?Item=N82E16820148609

Would work in the new iMac 27. That's 2x8GB in Dual Channel. 2 sets of those should give me 32GB, 2 sets of 16GB in dual channel. Right?

Oh and I also wanted to say that you just max out on everything Apple (*your signature*)!!!

I'm using these: http://www.newegg.com/Product/Product.aspx?Item=N82E16820231582 and they work just fine with lower latency than the ones you linked (not that I'd probably ever notice the difference) and a couple bucks less.

 

[gnasher729]

OK? What does CL11 have to do with it?

Here's my explanation if I understand it all correctly:

RAM that is 1600 MHz and CL11 can run at a clock speed of 1600 MHz and takes 11 clock cycles to read or write data. The same RAM can also run at 1333 MHz. And because the clock speed is lower and the clock cycles longer, it takes only 9 of the longer clock cycles to read or write data at the lower clock speed. So the same RAM would also work as 1333 MHz CL9 RAM. Note: Higher MHz is faster, while higher CL is slower.

RAM chips in your Mac must _all_ run at the same MHz and CL. If they are not identical then the Mac must either reduce MHz or increase CL so that they match.

If you buy 1600 MHZ CL11 + 1600 MHz CL11 then you get 1600 MHz CL11.

If you buy 1600 MHz CL11 + 1600 MHz CL10 then the Mac could either give you 1600 MHz CL11 (slow down the CL of the faster CL10 chips to CL11), or it could give you 1333 MHz and probably CL9 (slow down the MHz, but give you faster CL). And apparently it choses 1333 MHz CL9. Which is just a tiny fraction faster than 1600 MHz CL11.

 

[iAco]

I'm using these: http://www.newegg.com/Product/Product.aspx?Item=N82E16820231582 and they work just fine with lower latency than the ones you linked (not that I'd probably ever notice the difference) and a couple bucks less.

Is this ram you linked me to better than the one I linked you to?

CAS 10 is better than 11. And they both run at 1600MHz. So the GSKILL RAM is indeed faster (and better?)

I'm just curious about the quality of GSKILL compared to micron NAND you see in Crucial.

Thoughts???

 

[scubadoo]

Is this ram you linked me to better than the one I linked you to?

CAS 10 is better than 11. And they both run at 1600MHz. So the GSKILL RAM is indeed faster (and better?)

I'm just curious about the quality of GSKILL compared to micron NAND you see in Crucial.

Thoughts???

I'm not sure if you'd even notice the difference between 11 and 10 if using 32GB of either, but you shouldn't mix the 10CL with the existing Apple ram which runs at 11CL, it will downgrade the clock speed to 1333Mhz. I got the GSkill because it was a lot cheaper when I actually bought it but has gone up almost $10 in a few weeks.

 

[iAco]

I'm not sure if you'd even notice the difference between 11 and 10 if using 32GB of either, but you shouldn't mix the 10CL with the existing Apple ram which runs at 11CL, it will downgrade the clock speed to 1333Mhz. I got the GSkill because it was a lot cheaper when I actually bought it but has gone up almost $10 in a few weeks.

Aha. Got it.

I will go with the 11CL configuration then. I want to match whatever Apple puts inside these things.

I ordered the 8GB model with 2x4GB sticks. I'm gonna toss those and just get 4x8GB brand new Crucial RAM (11CL).