Precision 7550 & 7750 Owners' Thread

2400 MHz is probably too slow. It doesn't necessarily matter if they were "supplied by Dell" ... they were supplied in a system that is three generations older. Dell is not taking steps to ensure that a wide selection of modules are compatible... they generally expect you to order the modules from them
On the U.S. site I am seeing a non-ECC 128GB option, it is 4x32GB DDR4-2933.
Again, there is no reason that this system cannot take 128GB. You just have to work out the compatibility issues yourself if you do not purchase the modules with the system...
Your best bet would be to check the speed and timings of the modules that shipped with the system and order new modules with the same specs.

 

Reinstall the stock RAM, and take a note of the model numbers. If the RAM capacity is the only thing you absolutely need, then you can purchase Dell's RAM.

Your best bet would be non-XMP JEDEC-compliant memory.

 

I've put 2x16GB into secondary with 1x8GB 2933 (shipped with system) into primary. And it works!
There's a HUGE difference in price of RAM when buyed from Dell vs free market. Basically this difference is average monthly salary in Poland.
So I'll try work this out.
Furthermore- Dell allows for this upgrade, and this is 5kEUR laptop after all (my friends think I've lost my mind) so they really could support such upgrades.
I'll ask them directly, what should on Monday.

32GB/2933 memories are only a few - one Kingston (2933 CL17, and CL21), one Corsair (2933 CL19) and one Mushkin (2933 CL21). So that should be easy to pin point.
Another clue is voltage - my Crucials are 1.35V, almost all slower memories (and ones supplied by Dell) are 1.2V.

 

Yes, voltage can throw it off.
Mix-matching modules can "trick" the system into running with modules that wouldn't work by themselves, by forcing them to run at a lower speed.

And I do agree that Dell could do a better job supporting memory upgrades or at least clearly specifying the specs that users should be looking for. This seems to be a more recent problem (starting around the 7730/8th gen systems?), because I never heard stories like this about memory upgrades not working in earlier systems. But it's probably exacerbated by just the wide variety of memory configurations being sold these days (XMP, different voltages, etc.).

Totally understand wanting to save money by purchasing the RAM modules aftermarket. Just don't go in assuming that any current modules will work... it takes some digging to figure out.

 

Hi everyone! Looking forward to perusing all the replies in this thread.

Back in March 2018 I purchased a Precision 7720. It has been my beast ever since. Fast forward to this past October 2020 and I opened a support ticket with Dell because I was getting a weird power surge on USB port error message that I couldn't resolve. We went through a number of troubleshooting steps and they declared the motherboard needed to be replaced. The motherboard was on back order and every week the tech would check in with me and let me know the motherboard was still on back order. Honestly the power surge error was annoying but everything else works fine so I patiently went along with their updates without giving them any flack. Week after week went by until beginning of January they came back and said that the motherboard shows it won't be available until sometime in February at the earliest so they decided they were going to replace my laptop entirely with either the same model or a new unit! Of course no more 7720s were available...

Incredibly, they're building a brand new 7750 spec'd out as close as possible to my 7720, and my warranty allows me to keep my current hard drives (I know the 2.5" 1TB drive won't work in the 7750). I'm still in disbelief - I bought the 7720 back in March 2018 for $3,700 and now almost 3 years later they're building and shipping me a brand new 7750 spec'd out for over $4,000 as a warranty replacement...! Definitely the best warranty I've ever purchased, that's for sure!

 

Ok, I've talked with Dell Support.
They basically have only this for reference:
https://www.dell.com/support/manual...7064b8-2eb4-49ec-88a8-43b102e42417&lang=en-us

So it would seem that the only way is buying 4x32GB 2933MHz memory.
There are two available for me:

HyperX HX424S14IB/4 Impact DDR4 2x32GB 2933/Cl17

https://www.amazon.de/-/pl/dp/B0848NL2BQ/?ie=UTF8&language=en_GB

Or
Corsair Vengeance SODIMM DDR4 64GB 2933MHz CL19 (CMSX64GX4M2A2933C19)

https://www.morele.net/pamiec-do-la...4gb-2933mhz-cl19-cmsx64gx4m2a2933c19-7348274/

Which one would you suggest?

Or should I go safer route and buy even slower 2666Mhz memory?
I've found one dedicated for 7740.

Last option is Purchase directly from Dell but it's two times more expensive.

 

I would get the CL19.

 

I am also interested in the purchase of the 7750 along with 128GB after market memory in order to support a large VM lab. I look forward to your final results with this set as I'd like to spend less money on probably higher quality ram but also realize the need at times to purchase exactly from Dell along with warranty just to rule out any compatibility issues. I thought about the Lenovo P17 as an option as it also supports 128GB RAM but is limited to only two SSD slots as opposed to the 7750 with four. With VMs I'm usually using more hard drive space and memory.

 

Hi all!

Does anyone happen to know if the 7550 WWAN port will accept some form of storage please? There's myriad discussion around the internet about the capabilities of WWAN interfaces in Dell laptops, but it's apparently very model-specific and I haven't found any discussion around it for the 7550. It looks as though a 2242-something would fit nicely in there, but there seems to be no telling if it ought to be SATA or NVMe, or even if either would work at all.



The owner's manual makes mention of two PCI slots (my guess is the wifi and wwan), but also two SATA slots which I haven't been able to find hide nor hair of. There appear to be a few unoccupied headers on the board but they're all unlabeled. If anyone knows where to find the SATA slots that would be awesome too!

Thanks for reading!

 

M.2 is a physical interface for the slot only, over which different electrical signals specified by different standards can be sent, which include PCIe, NVMe, and SATA.

You can try a M2.2242 NVMe/SATA module in the WWAN slot, but as mentioned above, if the slot doesn't provide the electrical NVMe/SATA interface, then best case it doesn't work, and worst case you short the device/your motherboard.

From what I understand, Dell mentioned that it would not support the SATA electrical interface anymore, but as you mentioned, the manual appears to claim otherwise. You might consider getting a cheap SATA M.2 drive (they're actually quite rare, given how cheap NVMe has become; SATA 2.5" SSDs are more common) to test out which of the M.2 slots support the SATA interface.