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And this is why I've mentioned: the "System Report" on mac shows them in the memory list with DIMM1 as DDR3 1600 and DIMM2 as 1333; even though they can't be running at those speeds.
Hence my distrust on what it displays there is meaningless when it comes to determining what speed the DIMMs actually run at.
I don't talk about "System report", I talk about CPU-Z, a software who reports instant frequencies of your machine.
http://www.cpuid.com/softwares/cpu-z.html
And CPU-Z reports the same frequencies than the system info on Mac OS ;) (and in "About my Mac", on the "Memory" section, I can only see one frequency: the good one).

The memory modules actually run at their speed (I've seen 1867 and 2133 modules running at the proper frequencies on recent iMacs).

Here is the screenshot of this software found on the net. I will post mine tonight, with the same proper frequency (about 933MHz -1866/2) on a Mac that is supposed (Intel and Apple specs) to only support 1600MHz (800 would be displayed on CPU-Z in that case). :)

And it is a "live" measure: 932,2MHz is a precise and instant measure, not just a spec red on the RAM ;)

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Agreed, however 64GB of ram sounds useful to me. Has anyone here installed OWC's 64GB upgrade?
I was told 64gb would not be faster than 32gb, it would just keep you running longer before your memory filled up. So I passed on owc 's kit and went with 2133 memory
 
Agreed, however 64GB of ram sounds useful to me. Has anyone here installed OWC's 64GB upgrade?

I haven't seen anyone say they have ordered it. My guess is that it is too expensive. OWC is charging right in line with Apple

Apple 32GB = $600
OWC 64GB = $1,200

I guess they figure if you are willing to pay apple's markup $1,200 isn't bad.
 
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Been looking at maxing out the RAM on the new iMac's, but Crucial (who are the main guys I go to), don't appear to have any listed for the Late 2015 iMac and can't find any others here in the UK, as not really sure what to look for in terms of specs - until I came across this thread ;)

Can anyone confirm that the Kingston one's mentioned above are these one's from the Amazon UK site please?

http://www.amazon.co.uk/Kingston-Hy...sp0Lp8L&dpSrc=sims&preST=_AC_UL160_SR160,160_

I am planning to order 2 packs of these for delivery tomorrow to max out the iMac :D

TIA.
 
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The fastest you can find on the market in SODIMM: latency 11-11-11-31 vs 11-12-13-?? for the 2133MHz Kingston. :)

Yeah, I couldn't find the timing for the Kingston/HyperX HX321LS11IBK2/8, just the CAS latency. They also have no ratings on Newegg and aren't Amazon Prime. :rolleyes:
 
Woops, OK now I'm confused. I just looked at my invoice and it looks like I've ordered the CL11-12-13 version. Is it really much of a difference?
No, I don't think so; even in memory benchmarks there won't be any difference ;)
 
Unlikely you will notice.
@ericv just up this page you said it was the hyperx HX321LS11IB2/8 you got, right? that seems to be 11-12-13 from the kingston website. the 11-11-11 stuff is the HX321LS11IBK2/8 (extra K in the name) which seems to be discontinued for some reason. just 100% checking which one you bought before I spend.
 
Just an update. I've finished two nights in post-production with the 2133mhz without any issues. So there's no doubt the Kingston hyperx is stable enough for professional work.

Need some more time with the iMac before I write a review.
 
Just an update. I've finished two nights in post-production with the 2133mhz without any issues. So there's no doubt the Kingston hyperx is stable enough for professional work.

Need some more time with the iMac before I write a review.

Yeah, have to agree. My hyperX 2133mhz ram is stable also.
 
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