Dell OptiPlex 3090 M vs. Dell OptiPlex 7090 MT

Comparison and Differences

Dell_OptiPlex_3090_M.jpg case front and back pannelDell_OptiPlex_7090_MT.jpg case front and back pannel
Model
Form factorMicroMini Tower
CPU optionsIntel Gen10 i3/i5/i7; Pentium; Celeron;Intel Gen10&11 i3/i5/i7/i9;
ChipsetQ470Q570
Dedicated GPU *N.A.GeForce RTX 3070 (OEM)
RAMSODIMM DDR4-2666/2933DIMM DDR4-2666/2933/3200
RAM slots24
RAM speed2933 MT/s3200 MT/s
RAM max64 GB128 GB
USB ports(4x) USB-A 3.0; (2x) USB-A 2.0;USB 3.2 Type C; USB 3.1 Type C; (2x) USB-A 3.1; USB-A 3.0; (x4) USB-A 2.0;
Video ports(2x) Display Port 1.4;(4x) Display Port 1.4; (x3) HDMI 2.0b; VGA;
Other portsRJ45; Headset; Line-Out;RJ45; Audio; Line-Out/In; Serial; (x2) PS2
Optional portsHDMI 2.0b/Displayport/VGA;USB Type-C (DP Alt Mode); Media Card Reader;
SATA ports14
PCI slotsN.A.PCIe 4.0 x16; PCIe 3.0 x4; PCIe 3.0 x1; PCIe-32
M.2 slotsM.2 2280/2230 M-key (PCIe 3.0 x4, NVMe); M.2 2230 (WiFi/BT) M.2 2280/2230 M-key (PCIe 3.0 x4, NVMe); M.2 2230 M-key (PCIe); M.2 2230 (WiFi/BT)
Drive bays2.5in;(x2) 3.5in; (2x) 2.5in; 5.25in (slim);
PSU65 W260/300/369/500 W
Weight1.28 kg (2.82 lb)10.22 kg (22.53 lb)
Released20212021
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 M and Dell OptiPlex 7090 MT

Both computers, the Dell OptiPlex 3090 M and the Dell OptiPlex 7090 MT, were released during the same year - 2021.

If you are looking for the smaller form factor the Dell OptiPlex 3090 M is the right one for you. It is smaller than the Dell OptiPlex 7090 MT and will fit more easily under your desk.

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 7090 MT as it is running a newer generation CPU. This is not to say that Dell OptiPlex 3090 M is bad - it can still run some powerful CPUs, albeit being an older generation.

Memory

The Dell OptiPlex 7090 MT has 4 RAM slots while the Dell OptiPlex 3090 M 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 7090 MT is using the faster 3200 MT/s RAM. The Dell OptiPlex 3090 M is slower by supporting RAM speeds of up to 2933 MT/s. Additionally, if you will be needing a lot of RAM, better go for the Dell OptiPlex 7090 MT as it has the ability to run 128 GB of RAM. The Dell OptiPlex 3090 M can do a bit less at max 64 GB. Most of the times, this should be sufficient for the majority of users.

Ports

In total the Dell OptiPlex 7090 MT has 9 USB ports. The Dell OptiPlex 3090 M is inferior in this regard and packs 5 USB ports. In any case, if you miss USB ports, you can always purchase a USB hub. What is nice about the Dell OptiPlex 7090 MT, is that it has 3 USB 3.1 port(s) which allows transfer of up to 10Gb/s. Unfortunately, the Dell OptiPlex 3090 M has no such port, thus restricting your transfer speeds significantly. For people who want to use external drives on regular basis, this might be an issue.

DisplayPort is crucial for any desktop machine. It is good to see that both models are featuring DisplayPorts. However, the Dell OptiPlex 7090 MT comes with 4 ports, while the Dell OptiPlex 3090 M has only 1. If you are planning to use multiple monitors, the Dell OptiPlex 7090 MT is the better choice.

The Dell OptiPlex 7090 MT comes with an HDMI port, while the Dell OptiPlex 3090 M 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 7090 MT is better equipped as it comes with 4 SATA slot(s), while the Dell OptiPlex 3090 M has 1 slot(s).

An M.2 SSD can be several times faster than a SATA one. Thus, we are happy to see that both models support the M.2 interface. However, the Dell OptiPlex 7090 MT has 1 M.2 slots while the Dell OptiPlex 3090 M comes with just 1.

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 3090 M comes with a decent 65 Watt PSU, but the Dell OptiPlex 7090 MT has a more powerful one rated at 500 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_M_motherboard.jpg motherboard layoutDell_OptiPlex_7090_MT_motherboard.jpg motherboard layout