Did you notice, is the Kingston RAM using Micron chip or Hynix ?
Kingston never replied me to confirm if Kingston RAM for Mac uses locked BOM.
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Memory upgrade troubleshooting in 2020 27-inch iMacs
- Thread starter KrazyKanuck
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Kingston never replied me to confirm if Kingston RAM for Mac uses locked BOM.
Yeah, it looks like I was wrong about this. Or at the very least "woefully out-of-date." I built my current game-rig, (now powering a Pimax 5K+) several years ago and at that time there was so little difference in performance between memory speeds that it simply made no difference at all unless the speed differences were extreme, and even then the differences were extremely small. This was also true when it came to upgrading older systems like the classic MacPros. There just wasn't any meaningful real-world difference.
That's no longer the case, which I could have discovered had I googled:
(YouTube links to proper time for FPS graphs):
Reddit Post with some nice benchmarks as well
(Personally, I like using game benchmarks as an overall system-performance metric because games tend to hammer everything in a system so aggressively. Regardless, seeing these kinds of performance differences in game titles certainly shows that RAM speeds have real-world performance implications in modern computers.)
So ignore my incorrect post and definitely try to maximize your RAM speeds in your modern Macs, (but probably don't bother to worry about it in older systems).
I really gotta build a new game-rig now. Oh boy.
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Just finished installing 128 GB's of Crucial's RAM!
System: iMac 20.1 (i9 3.6 GHz 10-core, AMD Radeon Pro 5500 XT)
Geekbench Results:
![iMac20,1.png]( "iMac20,1.png")
Novabench RAM test results w/ 128 GB:
![RAM Transfer Speed 31175 MBs.png]( "RAM Transfer Speed 31175 MBs.png")
System: iMac 20.1 (i9 3.6 GHz 10-core, AMD Radeon Pro 5500 XT)
Geekbench Results:
Novabench RAM test results w/ 128 GB:
https://browser.geekbench.com/v5/cpu/3836982 my geekbench result for 2x32 Samsung M471A4G43MB1-CTD.
I tried to run my Imac2020 with aftermarker + Apple memory, but it crashed and didn't start.
Samsung memory works great, apple hardware test doesn't show any errors, benchs looks better (ram speed is better that 2x4 apple ram too).
I tried to run my Imac2020 with aftermarker + Apple memory, but it crashed and didn't start.
Samsung memory works great, apple hardware test doesn't show any errors, benchs looks better (ram speed is better that 2x4 apple ram too).
I am testing 64GB in 2×32GB configuration from Crucial. I bought the CT2K32G4SFD8266 kit but Crucial's site says it is not compatible and instead recommends the CT2K32G4S266M kit. As far as I can tell this is just a "Mac Compatible" branding and nothing else, but please enlighten me if I am wrong.
RAM transfer speed tests from Novabench:
Apple 8GB: 26,122MBps
Crucial 64GB: 29,397MBps
Geekbench is normal as well, I believe; 1391 single, 8907 multi (i7-10700K w/ 64GB). Any reason for me to return that kit and buy different memory?
RAM transfer speed tests from Novabench:
Apple 8GB: 26,122MBps
Crucial 64GB: 29,397MBps
Geekbench is normal as well, I believe; 1391 single, 8907 multi (i7-10700K w/ 64GB). Any reason for me to return that kit and buy different memory?
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Too much handwringing in this thread... Why all the shilling for Crucial? I bought a pair of 32 GB NEMIX modules (64 GB total) from NewEgg and they are running at 2667 MHz and 30,101 MB/sec (RAM score: 366) in Novabench. $220 delivered.
I've put Crucial in most of my Macs since I started using them in 2007 and never had a problem, bought G.SKILL once and they were good too. Like anything, branding works; I buy what I'm familiar with and trust. My pair of 32GB modules cost CAD$375 so I'm a bit jealous your price, I'll keep looking around but Newegg is a no-go lately for me because they ship from US and charge for that and for returns.
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With Crucial, you know you get good quality Micron DRAM chips. And it will always be Micron chips. So if you buy 2x32 GB and have two free slots, you know you can buy another kit in a year or two and have the exact same chips so it will work flawlessly. They have top notch testing procedures, their modules are certified. You absolutely know 100% that it will work flawlessly. All this has a price.
I got my i7 iMac last week, had a stick of 8 gb crucial ram 2666 ddr4 so-dimm so stuck it in. At first the 2 apple 4gb sticks were arranged in slots 1 and 3 so I stuck the 8gb in slot 2. About this mac recognised the ram as 16gb total but running at 2133 speed so I looked up Apple's advice on ram upgrades and paired the 2 apple ram sticks to slots 1 and 2 while placing the spare ram in slot 4. Now the ram is working at 2666mhz. No idea whether this configuration loses dual channel or not.
Ran geekbench, got a slightly higher score compared to when it only had the 2 apple sticks. Suspect the score might be even faster had I stuck 2 8gb sticks in stead of the 3 sticks of 2x4gb and 1 8gb.
Ran geekbench, got a slightly higher score compared to when it only had the 2 apple sticks. Suspect the score might be even faster had I stuck 2 8gb sticks in stead of the 3 sticks of 2x4gb and 1 8gb.
Probably flex mode, but as both channels have the same amount of RAM, the end result is not big different from real dual channel of 4x4GB
Probably not running dual channel, but it might be OK because you have 8GB (2x4GB) in Channel A and 8GB in Channel B.
"Certain Intel chipsets support different capacity chips in what they call Flex Mode: the capacity that can be matched is run in dual-channel, while the remainder runs in single-channel."
Run Novabench RAM speed test and you should get about 28,000 MB/s if in dual channel. (Run it several times and use the highest score.) If you get much lower, it is not running dual channel
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You can run Geekbench 4. It will give you detailed scores on memory performance. And you can compare in the database of Geekbench 4 (search for iMac20, )
Hey guys. Quick question.
This RAM: https://www.newegg.com/crucial-32gb-260-pin-ddr4-so-dimm/p/N82E16820156230?&quicklink=true
Or, this RAM: https://eshop.macsales.com/item/OWC/2666DDR4S32P/
Thanks for the help ????.
This RAM: https://www.newegg.com/crucial-32gb-260-pin-ddr4-so-dimm/p/N82E16820156230?&quicklink=true
Or, this RAM: https://eshop.macsales.com/item/OWC/2666DDR4S32P/
Thanks for the help ????.
Either one.
All other things being equal (cost, shipping time, return policy, etc), I would say Crucial is slightly preferred, only based on brand recognition.
Hey guys. Quick question.
This RAM: https://www.newegg.com/crucial-32gb-260-pin-ddr4-so-dimm/p/N82E16820156230?&quicklink=true
Or, this RAM: https://eshop.macsales.com/item/OWC/2666DDR4S32P/
Thanks man.
This RAM: https://www.newegg.com/crucial-32gb-260-pin-ddr4-so-dimm/p/N82E16820156230?&quicklink=true
Or, this RAM: https://eshop.macsales.com/item/OWC/2666DDR4S32P/
Thanks man.
I ordered 32 GB of OWC RAM (2x26) and installed in the upper two slots with the original Apple RAM (2x4) in the lower two slots. I *thought* I had a no-boot issue, but it turns out that the memory test took about 30 seconds. So, from the time you press the power button be sure to allow enough time for the memory to be recognized. The apple won't show up on the screen until that happens.
You are not in dual channel mode then, thus resulting in lower performance.
Ditto. I thought it wasn't starting, too, and realized it was checking the memory. I installed my extra RAM before starting up for the first time.
That is not the point of the screenshots. The point is to show that the 2020 iMac has a different configuration in terms of names and positions of the modules.
OK, so where did you find out that it was only running at 2333? Trying to sort out all of this info as I troubleshoot my 128gb OWC ram problems.