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MP 7,1 Ram: Samsung vs Crucial
- Thread starter chfilm
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Well that just sent me down quite the rabbit hole. You made me realize I had no idea how the hex values from the SPD translated to timings.
The SPD includes upper and lower bounds for the unit interval or duration of a clock cycle, and although stored in an utterly arcane fashion, these can be expressed as times using whatever units you prefer. And of course the data rate that we're used to seeing can be obtained by taking the inverse of those times and multiplying by 2. Then there's a table of supported CAS latencies which correspond to integer values from 7 to 52 representing the number of clock cycles. And finally a minimum CAS latency time.
So yeah, not exactly as I had envisioned. Regardless, when you see CAS latency expressed as CL=n, n is an integer number of clock cycles. The duration of a clock cycle is dependent on frequency though, so you can't just say CL=21 is lower/better than CL=24 unless the frequency is constant. However, the CAS latency expressed in ns is directly comparable and is easily calculated by dividing 2000 by the data rate in MHz.
All that to say, thanks for helping me learn something new!
Do you have any idea who actually made those modules? Are you familiar with the Nemix brand? Do you know how they source or test their memory? Do you know and trust Amazon marketplace seller nvtek?
NEMIX RAM 64GB (2X32GB) DDR4 2933MHZ PC4-23400 2Rx4 1.2V 288-PIN ECC RDIMM Registered Server Memory KIT
NEMIX RAM 64GB (2X32GB) DDR4 2933MHZ PC4-23400 2Rx4 1.2V 288-PIN ECC RDIMM Registered Server Memory KITwww.amazon.com
What about this? $240 for 64gb (2X32gb)
These could be 100% totally fine and dandy, but when purchasing aftermarket RAM, there's definitely an associated risk matrix. You can quantify that risk to some extent by asking yourself the following questions:
How are you searching?
1. By part number for original equipment, genuine replacement, or manufacturer provided upgrade kit.
2. By part number for equivalent module from validation list provided by platform manufacturer.
3. By specifications provided by the device or platform manufacturer.
4. By make and model of the device.
Who are you buying from?
1. Device manufacturer or authorized reseller.
2. Trusted retailer.
3. Trusted individual.
4. eBay, Craigslist, or sketchy marketplace reseller.
What are you buying?
1. Original equipment, genuine replacement, or manufacturer provided upgrade kit.
2. Equivalent replacement that meets or exceeds the standards of the original equipment.
3. Functional replacement that meets minimum device and platform specifications.
4. Replacement part that is non-functional or fails to meet device or platform specifications.
5. Counterfeit or stolen goods.
Who made it and how is it marketed?
1. Original component manufacturer with device manufacturer branding.
2. Original component manufacturer under their own label or with third-party branding.
3. Assembled by trusted third-party and sold under their own brand.
4. Unknown manufacturer with house brand of trusted retailer.
5. Unknown manufacturer with obscure branding or generic.
What condition is it in?
1. New in retail packaging.
2. New open-box or bulk packaged.
3. Used or pulled from another system.
So is the savings worth the additional risk over say buying new Samsung M393A4K40CB2-CVF modules from Newegg for $139.99, or CT32G4RFD8293 modules direct from Crucial for $167.99? Well that's totally up to the individual making the purchase.
As an Amazon Associate, MacRumors earns a commission from qualifying purchases made through links in this post.
NEMIX RAM Memory for Apple, Dell, HP, IBM, Sun, Cisco,Servers
NEMIX RAM™ manufactures computer memory upgrades. We specialize in Apple, Dell, HP, IBM, Sun and Cisco products, with best price and quality products.
www.nemixram.com
Right, so going by my risk matrix, your score is 3, 4, with any luck 3, 5, and with any luck 2. In other words, about as sketchy as it gets. As I said, whether the savings is worth the risk is entirely dependent on the buyer in question. A lot of people will pay Apple's prices just to play it safe and to avoid having to figure any of this stuff out. Others will gladly buy stuff off of eBay that may or may not have just fallen off the back of a truck.NEMIX RAM Memory for Apple, Dell, HP, IBM, Sun, Cisco,Servers
NEMIX RAM™ manufactures computer memory upgrades. We specialize in Apple, Dell, HP, IBM, Sun and Cisco products, with best price and quality products.
That Nemix RAM has been all over Newegg lately - always turns up on the top of their featured lists, and there are some combinations of size, speed and type where they don't show you anything else. It's a 3rd party seller on Newegg, claims to be in Florida, website is in relatively standard English, which makes it more likely to be a US company (there's certainly plenty of high-quality RAM assembled overseas, but nobody would assemble counterfeit RAM in the US - the FTC might actually investigate - so US-based is a decent bet).
Newegg's and especially Amazon's embrace of 3rd party sellers have made counterfeit goods much harder to avoid. Nemix may or may not be a counterfeit seller - probably not (they claim that they've been a business-to-business RAM vendor for nearly 30 years with clients like NASA and Harvard), but there are certainly plenty of counterfeit sellers out there (I've seen some pretty terrible camera batteries in particular, and those can explode if put together wrong).
Newegg's and especially Amazon's embrace of 3rd party sellers have made counterfeit goods much harder to avoid. Nemix may or may not be a counterfeit seller - probably not (they claim that they've been a business-to-business RAM vendor for nearly 30 years with clients like NASA and Harvard), but there are certainly plenty of counterfeit sellers out there (I've seen some pretty terrible camera batteries in particular, and those can explode if put together wrong).
can you provide the links to the ones you purchased?I just ordered them! 30day Return window so I can comfortably Test them when the beast arrives here hopefully January 2nd
[automerge]1576622876[/automerge]
Just google M393A4K40CB2-CVF.
It was in that list of INTEL tested Dimms and I found it on one German Mac Ram shop listed for the Mac Pro, so I think it should work just fine.
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Looks like this person bought nemix ram and worked well in Mac Pro...
I wimped out and got 96GB BTO with my Mac Pro from Apple.
to BTO 96GB costs £900 (6x16gb)
to later upgrade from apple costs £2160 (6x16gb)
to buy from good uk shop costs about £500 so maybe I was silly. But liked the idea of Apple Care warranty on it, and not worrying that I had got wrong ram.
I wimped out and got 96GB BTO with my Mac Pro from Apple.
to BTO 96GB costs £900 (6x16gb)
to later upgrade from apple costs £2160 (6x16gb)
to buy from good uk shop costs about £500 so maybe I was silly. But liked the idea of Apple Care warranty on it, and not worrying that I had got wrong ram.
So many BTO options with this Mac Pro. I keep second guessing what I picked. Already cancelled my order with 580x and reordered with VegaII.
So now you saying I should cancel my order and buy with just 32gb. I’ll never manage to get a Mac Pro 😂
Will order the 7.1 with 48 Gb RAM - Am upgrading -
Just ordered:
Crucial 32GB DDR4-2933 RDIMM
CT32G4RFD8293
$167.99 x 2
0 Tax
0 Shipping
Just ordered:
Crucial 32GB DDR4-2933 RDIMM
CT32G4RFD8293
$167.99 x 2
0 Tax
0 Shipping
Just save yourself 1k and invest it into the STAND for the xdr haha.
I'm not rushing into this. Will purchase in January 2020.
I feel your anxiety over such a big decision/purchase.
My current iteration (and there have been so many earlier ones I've lost count) is the 16 core, 48 Gb Ram, one pro vega II duo, 4 Tb SSD, XDR with Stand, and NO Afterburner. However, i am not going to cement myself into this package just yet. Keeping my powder dry for the next few weeks. Reading and watching and discussing all I can.
What Made you order the 48gb instead of 32gb if you are going to upgrade ram yourself?
curious because I did the same thing, because I wasthinking 48gb gives me six channel ram out of the box. And I hoped I can just pop in more as I go along.
LOL - you have great timing.
I'm just now talking about this with another poster in a private message. We agreed that the 32 Gb option is better. Using 8 sticks interfere with the ability to maximize channel usage... so I will go with the 4 32 Gb sticks and the 2 Crucial 32 Gb sticks to keep the total at 6. At the price I got, I am t thinking of getting 4 more and be done with it.
Wow -
Is everyone buying from Crucial???
==========
Crucial Order # 6067....
Thank you for your recent order. We regret that due to increased demand for the product you selected, we do not currently have sufficient inventory to fill your order. This will cause a delay in processing your order, but we do expect to ship it within 7 business days.
We apologize for any inconvenience this may have caused you. Crucial.com strives to maintain 100% accurate stock information on our website and to fill all orders on the day they are placed. However, sometimes it simply isn't possible due to the unexpected high demand for particular products.
Please contact us if you have any questions about this order, including the possible availability of an alternative compatible product.
The Crucial Team
Is everyone buying from Crucial???
==========
Crucial Order # 6067....
Thank you for your recent order. We regret that due to increased demand for the product you selected, we do not currently have sufficient inventory to fill your order. This will cause a delay in processing your order, but we do expect to ship it within 7 business days.
We apologize for any inconvenience this may have caused you. Crucial.com strives to maintain 100% accurate stock information on our website and to fill all orders on the day they are placed. However, sometimes it simply isn't possible due to the unexpected high demand for particular products.
Please contact us if you have any questions about this order, including the possible availability of an alternative compatible product.
The Crucial Team
lol nice.
Are there any speed issues with having 4 x 8GB sticks in slot 1-4, and 2 x 32GB sticks to fill the 5th and 6th slots?
I keep hearing different things, but for best speeds, do they need to be the same size as well?
I've been advised ~
By adding 2x32GB to the six 48Gb sticks you end up with 8 modules. That leaves the machine needing to run in quad channel, not hex-channel. This can affect speed/performance.
But to be honest - you need more explanation than that to make your informed decision. Last night, I purchased 4 more to bring my total to 6 and I will remove the 32Gb sticks. Decent price to me - and now no headaches that my limited computer knowledge can't solve.
But to be honest - you need more explanation than that to make your informed decision. Last night, I purchased 4 more to bring my total to 6 and I will remove the 32Gb sticks. Decent price to me - and now no headaches that my limited computer knowledge can't solve.
Just installed (6) 32 gig sticks of Samsung from Newegg.
No problems, running great.
No problems, running great.
I assume these will work fine?
Supermicro (MTA36ASF4G72PZ-2G9E2) 32GB SDRAM ECC Registered DDR4 2933 (PC4 23400) Server Memory Model MEM-DR432L-CL01-ER29 - Newegg.com
Buy Supermicro (MTA36ASF4G72PZ-2G9E2) 32GB SDRAM ECC Registered DDR4 2933 (PC4 23400) Server Memory Model MEM-DR432L-CL01-ER29 with fast shipping and top-rated customer service. Once you know, you Newegg!
The Micron original part number for this particular SuperMicro DIMM is MTA36ASF4G72PZ-2G9E2
The Micron original part number is the same as the one you have listed in the chart (and even what Apples uses as OEM), except this one has an "E2" at the end of it.
The specs all appear to be the same though.
I originally placed an order at Crucial, but then received an email saying it was on backorder. I chatted with custom service today and they said they have no ETA on the next stock.
I'm hoping since Micron makes the Crucial memory, this is essentially the same thing?
Yup ~ My second RAM order from Crucial is on backorder. The email stated that they 'hope' to send out in 7 days.I assume these will work fine?
Supermicro (MTA36ASF4G72PZ-2G9E2) 32GB SDRAM ECC Registered DDR4 2933 (PC4 23400) Server Memory Model MEM-DR432L-CL01-ER29 - Newegg.com
Buy Supermicro (MTA36ASF4G72PZ-2G9E2) 32GB SDRAM ECC Registered DDR4 2933 (PC4 23400) Server Memory Model MEM-DR432L-CL01-ER29 with fast shipping and top-rated customer service. Once you know, you Newegg!www.newegg.com
The Micron original part number for this particular SuperMicro DIMM is MTA36ASF4G72PZ-2G9E2
The Micron original part number is the same as the one you have listed in the chart (and even what Apples uses as OEM), except this one has an "E2" at the end of it.
The specs all appear to be the same though.
I originally placed an order at Crucial, but then received an email saying it was on backorder. I chatted with custom service today and they said they have no ETA on the next stock.
I'm hoping since Micron makes the Crucial memory, this is essentially the same thing?