Dell OptiPlex 7020 SFF vs. Dell OptiPlex 990 MT

Comparison and Differences

Dell_OptiPlex_7020_SFF.jpg case front and back pannelDell_OptiPlex_990_MT.jpg case front and back pannel
Model
Form factorSmallMini Tower
CPU optionsIntel Gen4 i3/i5/i7; Pentium; Intel Gen2 i3/i5/i7; Celeron; Pentium;
ChipsetQ87Q67
Dedicated GPU *GeForce GTX 1650 Low ProfileGeForce GTX 1650
RAMDIMM DDR3-1600 DIMM DDR3-1333
RAM slots44
RAM speed1600 MT/s1333 MT/s
RAM max16 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;
Optional portsN.A.Parallel
SATA ports34
PCI slotsPCIe 3.0 x16; PCIe x16 (wired x4);PCIe 2.0 x16; PCIe 2.0 x4; PCIe 2.0 x1;
M.2 slotsN.A.N.A.
Drive bays2.5/3.5in; 5.25in(slim)(2x) 3.5in; (2x) 2.5in; (2x) 5.25in;
PSU 255 W265 W
Weight6.00 kg (13.22 lb)8.87 kg (19.55 lb)
Released20142011
Manuallinklink
Price**Check PriceCheck Price

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* 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 7020 SFF and Dell OptiPlex 990 MT

If you are looking for a more modern desktop, then you should go with the Dell OptiPlex 7020 SFF which was released in 2014. The Dell OptiPlex 990 MT is older and entered production in 2011.

If you are looking for the smaller form factor the Dell OptiPlex 7020 SFF is the right one for you. It is smaller than the Dell OptiPlex 990 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 7020 SFF as it is running a newer generation CPU. This is not to say that Dell OptiPlex 990 MT 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 7020 SFF is using the faster 1600 MT/s RAM. The Dell OptiPlex 990 MT is slower by supporting RAM speeds of up to 1333 MT/s. In addition, you will be able to install the same amount of RAM in both models, and most probably 16 GB of RAM will be enough for most people. However, if you will be needing more RAM, make sure to check other desktop models too.

Ports

Both models have the same amount of USB ports for total count of 10. If this is not enough, using a USB hub is always a viable option. 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 7020 SFF comes with 2 ports, while the Dell OptiPlex 990 MT has only 1. If you are planning to use multiple monitors, the Dell OptiPlex 7020 SFF 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 990 MT is better equipped as it comes with 4 SATA slot(s), while the Dell OptiPlex 7020 SFF 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 7020 SFF, nor the Dell OptiPlex 990 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 7020 SFF comes with a decent 255 Watt PSU, but the Dell OptiPlex 990 MT has a more powerful one rated at 265 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_7020_SFF_motherboard.jpg motherboard layoutDell_OptiPlex_990_MT_motherboard.jpg motherboard layout