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Memory upgrade troubleshooting in 2020 27-inch iMacs
- Thread starter KrazyKanuck
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So for sure owc is aware of this situation and will ship 4 identical modules in a 32GB kit? (8 x 4) so there should be no problem with dual channel at full speed right?
Several of us have had this issue. for me and some others it was a kernel panic right out of the box and again when the new memory was installed. I tried many things including resetting the pram etc. Now it just works no matter what confoguration of memory i stick in. So I’m back to the regularly scheduled program of how to install my memory for the highest speed.
About OWC being aware. They have no excuse not to know by now, however, they are still selling a 96gb option that is clearly miss matched simms.
Im on the phone with OWC. They are checking about the question of getting 4 identical chips and just verified tgat they have now seen the Apple new advice and are working to make sure all 4 chips match. i told them that they should look at this thread and jump in and clarify things. I also suggested that they quit offerring a 96gb option as it makes them appear unknowledgeable.
I bit the bullet and will return everything and ordered 4x32gb From OWC.
I bit the bullet and will return everything and ordered 4x32gb From OWC.
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Crucial or Samsung. Crucial has certified Mac RAM if that matters to you (it does not to me so I got Samsung DIMMs and am running 128GB in dual channel, full speed).
I will point out for anyone worried about needing to buy all the RAM they might possibly need now, although RAM prices definitely go in cycles and older RAM can be harder/more expensive to source as it becomes more rare, in this case, I wouldn’t worry too much. Buy what you can afford/need. In the future, if you want to add more and want the best performance, if you can’t get an identical kit or sticks that match what you buy today, it is very likely prices will be lower and you can just replace your RAM next time for less than what you would pay today.
I would have been fine with 64GB of RAM (I had 48GB in my 2017 iMac) but Amazon screwed up so I got 128GB instead.
That's soooo bad
I know, I was devastated! Heh. In all seriousness, I offered to send the RAM Amazon told me was lost in the mail back after it arrived (I had to order two more sticks as a replacement) but they told me to keep it.
Its more complex than that. I damaged a 32gb stick while swapping from my 2019 imac to the 2020 imac. So i ordered a single 32gb stick and 2x16gb before i knew that they had to match. The 2 x 32gb are a different manufacturer, they work fine and fast in mt 2019 machine and poir and slow in the 2020.
I see, If I order a 32GB Kit from OWC (4 x 8gb) I shouldn’t have a problem right? I called owc today and they said that as long as the 4 Modules are from a kit then they will be by the same manufacturer and identical with even matching serial numbers as they will be from the same batch.
So four identical modules by same brand and the iMac didn’t accept them? How did you fix it?
That’s why they said on the phone, they said they have different chips, some hysex, some micron and some owc’s own chips and they can’t guarantee which ram brand you will get but if a kit is purchased they said all 4 modules will be identical In terms of the brand within the kit.
Why did SteveD123 in this thread a problem then? He had four identical modules from OWC and he said his iMac didn’t boot
Bad stick is always something possible.
And the fact I don't like OWC
lol.
Being a whore of DRAM chips brands isn't very winner for any RAM manufacturer. But that's exactly what OWC does. Even Kingston doesn't make this and have locked BOM (at least for ValueRAM server, but it wouldn't surprise me they do the same for system specific RAM).
The question is this though, assuming all 4 Ram modules are identical, Is ram produced by Micron better than Hynix Produced Ram or is there no difference?Bad stick is always something possible.
And the fact I don't like OWC
lol.
Being a whore of DRAM chips brands isn't very winner for any RAM manufacturer. But that's exactly what OWC does. Even Kingston doesn't make this and have locked BOM (at least for ValueRAM server, but it wouldn't surprise me they do the same for system specific RAM).
If you like Korean people go with Hynix. If you like American people go with Micron. Lol !
Seriously, absolutely no difference.
I'd be curious to email Kingston to know if they have locked BOM for Apple certified memory.
EDIT : Done.
EDIT : Done.
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