Dell OptiPlex 9020 MT vs. Dell OptiPlex 990 DT

Comparison and Differences

Dell_OptiPlex_9020_MT.jpg case front and back pannelDell_OptiPlex_990_DT.jpg case front and back pannel
Model
Form factorMini TowerDesktop
CPU optionsIntel Gen4 i3/i5/i7; Intel Gen2 i3/i5/i7; Celeron; Pentium;
ChipsetQ87Q67
Dedicated GPU *GeForce GTX 1660 SuperGeForce GTX 1650 Low Profile
RAMDIMM DDR3-1600 DIMM DDR3-1333
RAM slots44
RAM speed1600 MT/s1333 MT/s
RAM max32 GB16 GB
USB ports(4x) USB-A 3.0; (6x) USB-A 2.0; (10x)USB-A 2.0;
Video ports(2x) DisplayPort 1.2; VGA;DisplayPort 1.2; VGA;
Other portsRJ45; Hdph; Mic; Line-Out; Line-In; Serial; (2x) PS2; RJ45; Hdph; (2x) Mic; Line-Out; Line-In; PS2/COM; Serial; Parallel;
Optional portsN.A.N.A.
SATA ports43
PCI slotsPCIe 3.0 x16; PCIe x1; PCIe x16(wired x4); PCI; PCIe 2.0 x16; PCIe 2.0 x4; PCIe 2.0 x1;
M.2 slotsN.A.N.A.
Drive bays(2x) 2.5/3.5in; (2x) 5.25 inch3.5in; 2.5in; 5.25in;
PSU ATX 290 W250 W
Weight9.40 kg (20.72 lb)7.56 kg (16.67 lb)
Released20132011
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 9020 MT and Dell OptiPlex 990 DT

If you are looking for a more modern desktop, then you should go with the Dell OptiPlex 9020 MT which was released in 2013. The Dell OptiPlex 990 DT is older and entered production in 2011.

If you are looking for the smaller form factor the Dell OptiPlex 990 DT is the right one for you. It is smaller than the Dell OptiPlex 9020 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 9020 MT as it is running a newer generation CPU. This is not to say that Dell OptiPlex 990 DT is bad - it can still run some powerful CPUs, albeit being an older generation.

Memory

Both models have have equal amount of ram slots (4 RAM). Usually two RAM slots are more than enough for most cases. However, the count should be taken into account when planning how much and what combination of RAM you are going to need for your system.

The Dell OptiPlex 9020 MT is using the faster 1600 MT/s RAM. The Dell OptiPlex 990 DT is slower by supporting RAM speeds of up to 1333 MT/s. Additionally, if you will be needing a lot of RAM, better go for the Dell OptiPlex 9020 MT as it has the ability to run 32 GB of RAM. The Dell OptiPlex 990 DT 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 9020 MT has 10 USB ports. The Dell OptiPlex 990 DT 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.

DisplayPort is crucial for any desktop machine. It is good to see that both models are featuring DisplayPorts. However, the Dell OptiPlex 9020 MT comes with 2 ports, while the Dell OptiPlex 990 DT has only 1. If you are planning to use multiple monitors, the Dell OptiPlex 9020 MT is the better choice.

None of the models has an HDMI port. If your monitor supports only the HDMI interface, you will need to buy an adapter. Such adapters are cheap so nothing to worry about.

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 9020 MT is better equipped as it comes with 4 SATA slot(s), while the Dell OptiPlex 990 DT has 3 slot(s).

M.2 SSD interface allows you to transfer data with higher speeds compared to the old SATA interface. Unfortunately, neither the Dell OptiPlex 990 DT, nor the Dell OptiPlex 9020 MT has one. However, you can still use a SATA SSD drive which should give you satisfactory performance.

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 990 DT comes with a decent 250 Watt PSU, but the Dell OptiPlex 9020 MT has a more powerful one rated at 290 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_9020_MT_motherboard.jpg motherboard layoutDell_OptiPlex_990_DT_motherboard.jpg motherboard layout