Dell OptiPlex 3090 SFF vs. Dell OptiPlex 5040 SFF

Comparison and Differences

Dell_OptiPlex_3090_SFF.jpg case front and back pannelDell_OptiPlex_5040_SFF.jpg case front and back pannel
Model
Form factorSmallSmall
CPU optionsIntel Gen 10 i3/i5/i7/i9; PentiumIntel Gen6 i3/i5/i7; Pentium;
ChipsetQ470Q170
Dedicated GPU *AMD Radeon RX 6400 Low ProfileGeForce GT 1030 Low Profile
RAMDIMM DDR4-2666DIMM DDR3L-1600
RAM slots24
RAM speed2666 MT/s1600 MT/s
RAM max64 GB16 GB
USB ports(4x) USB-A 2.0; (4x) USB-A 3.0;(6x) USB-A 3.0; (4x) USB-A 2.0;
Video portsDisplay Port 1.4a; HDMI 1.4b;(2x) Display Port 1.2; HDMI 1.4;
Other portsRJ45; Audio; Line-Out/In;Serial; (2x) PS2; RJ45; Headset; Line-Out;
Optional portsHDMI 2.0b/Displayport/VGA;VGA; Media Card Reader;
SATA ports23
PCI slotsPCIe 3.0 x16; (2x) PCIe 3.0 x1;PCIe 3.0 x16; PCIe 3.0 x4;
M.2 slotsM.2 2230/2280 (PCIe 4.0 x4, NVMe); M.2 2230 (WiFi/BT) M.2 2280 M-key (PCIe 3.0 x4, NVMe)
Drive bays3.5in; 2.5in; 5.25in (slim);3.5in/(2x)2.5in; 5.25in (slim);
PSU200 W180 W
Weight5.10 kg (11.25 lb)6.00 kg (13.22 lb)
Released20212015
Manuallinklink
Price**Check PriceCheck Price

** As an Amazon associate we earn from qualifying purchases.
* Dedicated GPU warning: Check if your particular power supply model has enough power. Additionally some PSUs don't come with an auxiliary PCIe power connector and you may need to buy a SATA to PCIe power adapter.

Differences between Dell OptiPlex 3090 SFF and Dell OptiPlex 5040 SFF

If you are looking for a more modern desktop, then you should go with the Dell OptiPlex 3090 SFF which was released in 2021. The Dell OptiPlex 5040 SFF is older and entered production in 2015.

Both models have the same form factor, meaning reoughtly they have the same phiysical size and form.

Processor

Usually the newer the generation of the CPU, the better the performance and efficiency is. If your budget allows it, you should go with the Dell OptiPlex 3090 SFF as it is running a newer generation CPU. This is not to say that Dell OptiPlex 5040 SFF is bad - it can still run some powerful CPUs, albeit being an older generation.

Memory

The Dell OptiPlex 5040 SFF has 4 RAM slots while the Dell OptiPlex 3090 SFF has only 2 slot(s). This is not something to worry about. Just make sure you take it into consideration when planning how much RAM you are going to use.

The Dell OptiPlex 3090 SFF is using the faster 2666 MT/s RAM. The Dell OptiPlex 5040 SFF is slower by supporting RAM speeds of up to 1600 MT/s. Additionally, if you will be needing a lot of RAM, better go for the Dell OptiPlex 3090 SFF as it has the ability to run 64 GB of RAM. The Dell OptiPlex 5040 SFF can do a bit less at max 16 GB. Most of the times, this should be sufficient for the majority of users.

Ports

In total the Dell OptiPlex 5040 SFF has 10 USB ports. The Dell OptiPlex 3090 SFF is inferior in this regard and packs 8 USB ports. In any case, if you miss USB ports, you can always purchase a USB hub. None of the desktop models has a USB 3.1 port (10Gb/s), so if you need a fast connection to your peripherals, like external Solid State Drive, you will need to look elsewhere.

The DisplayPort is usually the more popular video port used with desktops and laptops, while the HDMI is used predominantly in consumer electronics. That's why, it is good to see that both of the models come with a DisplayPort.

The Dell OptiPlex 5040 SFF comes with an HDMI port, while the Dell OptiPlex 3090 SFF does not support the interface. Of course missing HDMI port is something that can be easily fixed with a good adapter (e.g. DisplayPort to HDMI).

SATA ports are placed on the system board and it is where you connect your HDD, SSD and Optical Disk Drives. More SATA slots will allow you to have more drives running at the same time. In this regard the Dell OptiPlex 5040 SFF is better equipped as it comes with 3 SATA slot(s), while the Dell OptiPlex 3090 SFF has 2 slot(s).

When your goal is to have the fastest SSD transfer speeds, an M.2 interface is crucial. Thus, it is good that both models have M.2 SSD slots. Today M.2 SSDs are not much more expensive than the average SATA drives, so it really does not make sense to invest in SATA drives anymore.

Make sure that the available M.2 slot supports the PCIe (also called NVMe) interface. This is important as there are M.2 slots which support only the inferior SATA III interface. For comparison, the SATA III interface has max speeds of 6Gb/s, while the PCIe 3.0 x4 will support speeds up to 32Gb/s!

Power Supply

Having a Power Supply Unit with high power rating is important, if you are going to use components which require extra power. The Dell OptiPlex 5040 SFF comes with a decent 180 Watt PSU, but the Dell OptiPlex 3090 SFF has a more powerful one rated at 200 Watts. Choosing either one depends on your specific requirements and use case. Also don't forget that some models might have more than one PSU option - try to always get the most powerful one, especially if you plan to upgrade to a powerful GPU.

Motherboard

Dell_OptiPlex_3090_SFF_motherboard.jpg motherboard layoutDell_OptiPlex_5040_SFF_motherboard.jpg motherboard layout