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Dell Optiplex 790 SFF Ram Upgrade?
Hello, I have a Small Form Factor Optiplex 790 that has a i3-2120, 3GB of DDR3 @ 1333, and a 250GB HDD.
So, I'm wanting to turn this into a little mobile gaming PC and I already got a Zotac GTX 1050 ti low profile card in it and working. I'm going to also upgrade the i3 to a i7-2600, and the 250GB HDD to a Seagate Firecuda 2TB.
As for the ram, I'm wanting to max it out with 16GB but I'm not sure what ram will work with it exactly. I've seen a lot of post where people are having issues with some ram not working when all 4 dim slots are filled, while others have no issues. I know that it will only run at 1333MHz so their is no reason for me to buy anyrhing faster, but when browsing NewEgg, they have a few different types. I'm seeing PC3L 10600, PC3 8500, PC3 10666, PC3 10660, and PC3 10600. Which version is the correct version of 1333MHz to use?
Also if you know of any ram that is certified to work with it, then you can just link that too.
But yeah, either way, my main question is what ram will work in my machine without any issues and give me a max capacity of 16GB (4 × 4GB).
Thanks!
So, I'm wanting to turn this into a little mobile gaming PC and I already got a Zotac GTX 1050 ti low profile card in it and working. I'm going to also upgrade the i3 to a i7-2600, and the 250GB HDD to a Seagate Firecuda 2TB.
As for the ram, I'm wanting to max it out with 16GB but I'm not sure what ram will work with it exactly. I've seen a lot of post where people are having issues with some ram not working when all 4 dim slots are filled, while others have no issues. I know that it will only run at 1333MHz so their is no reason for me to buy anyrhing faster, but when browsing NewEgg, they have a few different types. I'm seeing PC3L 10600, PC3 8500, PC3 10666, PC3 10660, and PC3 10600. Which version is the correct version of 1333MHz to use?
Also if you know of any ram that is certified to work with it, then you can just link that too.
But yeah, either way, my main question is what ram will work in my machine without any issues and give me a max capacity of 16GB (4 × 4GB).
Thanks!
DELL-Jesse L
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February 8th, 2018 06:00
Aprojectile,
Below are the memory specs for the 790.
Memory
The OptiPlex 790 system supports up to 16 GB of memory in the mini-tower (MT), desktop (DT), and small form factor (SFF) chassis with 64-bit operating system. The maximum memory supported in the ultra-small form factor (USFF) is 8GB. The memory speed supported is 1333MHz DDR3 memory.
However, 32-bit operating systems can only use maximum 4GB memory address space. Certain components within the computer require address space in the 4GB range, any address space reserved for these components cannot be used by computer memory the amount of memory available to the operating system is less than 4GB.
Memory modules should be installed in pairs of matched memory size, speed, and technology. If the memory modules are not installed in matched pairs, the computer will continue to operate, but with a slight reduction in performance.
NOTE:
The total amount of available memory will be less than 4GB. The amount less depends on the actual system configuration. To fully utilize 4GB or more of memory requires a 64-bit enabled processor and 64-bit operating system
Memory Configuration
DDR memory can run in dual-channel mode, which allows the system to have twice the memory bandwidth using the same memory technology.
Dual-Channel Configurations
To achieve dual-channel performance, the total memory in each channel must be the same. If the channels do not match or if the system has only one DIMM installed, the system memory operates in single-channel mode or in dual channel asymmetrical mode. The system works normally in single-channel mode, but the user loses the benefit of increased memory throughput.
Dual-channel mode is always present when both memory channels are populated. However, for optimum dual-channel performance, the size of the modules must match.
(in lowest DIMM speed)
(in lowest DIMM speed)
Basically, when both DIMM connectors are populated, the system has optimum dual-channel performance unless channels A and B have different amounts of memory.
Memory Speeds
Some confusion has been created due to the difference in the actual listings for speed ("MHz") and the way memory is described The listings below should resolve any confusion.
Aprojectile
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February 8th, 2018 07:00
https://www.newegg.com/Product/Product.aspx?Item=20-231-424
Now I know I would have to buy 2 sets to get a total of 16GB but I just want to double check that I'm getting compatible ram before I buy any, due to the price inflation.
Anonymous
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January 1st, 2019 10:00
I am doing pretty much the same the thing as you. Before I buy an SSD for this PC I'd like to make sure I can get 16gb RAM to work. At the moment it has dual channel 2x2GB (4GB in total), which is nowhere near enough!
Did you manage to get this sorted and if so please could you let me know what you used and perhaps link to it if possible?
Any help appreciated. I took 2 sticks from another Dell PC and filled all 4 slots but then this made the PC not boot...
Will any DDR3 1333MHz 240-Pin work?
DerOnkel
12 Posts
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June 8th, 2020 07:00
I've just made some upgrades to an Optiplex 790 SFF.
1. CPU changed from Intel Core I5-2400 to Intel Core I7-2600
2. RAM changed from 4x2GB to 2x8GB and 2x2GB
3. The HDD WD2500AAJS, 250GB was changed to a SSD Samsung PM810, 128GB
Result:
RAM and CPU detected from BIOS A22 -> No Problems
Win 10 Pro. detected als CPU and RAM -> No Problems
System is running since 5 days without any issues.
I suspect, that the system can also handle 32 GB of RAM.
(used RAM: Kingston KVR1333D3N9 8GB (1333 MHz, CL9) DDR3-RAM)
Ulf
speedstep
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June 8th, 2020 11:00
KVR1333D3N9 Kingston is 2GB PC3-10600 DDR3-1333MHz non-ECC Unbuffered CL9 240-Pin DIMM Dual Rank Memory Module
KVR1333D3N9/8G
is 8gig module
donm4599x
478 Posts
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June 8th, 2020 11:00
@DerOnkel
It must be a miracle. KVR ram supposedly almost never works in dells.
If you get 32GB of KVR working, please post back because that would be a quadruple miracle.
donm4599x
478 Posts
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June 8th, 2020 13:00
@speedstep
He left out the slash /
DerOnkel
12 Posts
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June 8th, 2020 14:00
Sorry, it was just a copy'n paste error from Amazon.
The correct article number for the memory is indeed KVR1333D3N9/8G.
I've just orderd 2 additional ones. So we can see, if it will work with 32GB...
Meanwhile I ran all Dell diagnostic test without any reportet issues. So...
By the way... the two 8GB moduls were running in an Optiplex 390 Mini Tower before. So now we have two Dells working with that memory. (The 390 also got the Intel Core I7-2600)
Ulf
donm4599x
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June 8th, 2020 15:00
Ulf, you're gonna be famous here ... 32 GB of Kingston Value Ram!!!!!
bradthetechnut
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June 8th, 2020 17:00
Screengrab below is from https://www.dell.com/community/Desktops-General-Read-Only/32GB-RAM-in-an-Optiplex-790-990/td-p/3880625
bradthetechnut
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June 8th, 2020 17:00
I guess it goes to show a 790 will take anything you throw at it.
DerOnkel
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June 8th, 2020 18:00
I missed to mention, that both systems got the latest BIOS update (A14 and A22)
(the memory is expected for thursday...)
Ulf
bradthetechnut
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June 8th, 2020 19:00
Not to turn this into a 7010 thread, but it's very similar to the preceding 790. So the 7010 has USB 3.0 and the CMOS battery was moved. Crucial sells 32GB RAM for the 7010. 16GB is listed max in the Tech Guide.
https://www.dell.com/community/Desktops-General-Read-Only/Optiplex-7010-memory-question/td-p/3994421
https://www.crucial.com/compatible-upgrade-for/dell/optiplex-7010-(desktop)
Crucial does still list 16GB RAM max for the 790. So we'll see how this all turns out. What was that, 24GB RAM @donm4599x has in his 790?
donm4599x
478 Posts
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June 8th, 2020 19:00
Hahaha. I think that's the thread I read last summer (locked safely away in Desktops General ).
A certain participant almost blew a gasket about folks putting 8GB modules in a 790. I did it anyway, and it's still working fine. Lots of others did it too.
Pretty funny stuff
DerOnkel
12 Posts
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June 11th, 2020 06:00
Now we've got the result...
My Optiplex 790 SFF with Intel Core I7-2600 runs 32GB of RAM
Used RAM: 4x8GB Kingston KVR1333D3N9/8G
Memory test in Dell Diagnostics passed without any issues.
Windows 10 reported 31,9GB available memory
Here are the results from CPU-Z:
As far as I got now 4 moduls, I will take 3 of them and check in my T3500 workstation, which has now 3x4GB RAM.
We'll see...