Dell Inspiron 3668 vs. Dell OptiPlex Tower Plus 7020 2024

Comparison and Differences

Dell_Inspiron_3668.jpg case front and back pannel

Dell_OptiPlex_Tower_Plus_7020_2024.jpg case front and back pannel

Model
Form factor	Mini Tower	Mini Tower
CPU options	Intel Gen6 i3/i5/i7; Celeron; Pentium;	Intel Gen 12&13&14 i3/i5/i7/i9
Chipset	H110	Q670
Dedicated GPU *	GeForce GTX 1650 Super	GeForce RTX 4060
RAM	DIMM DDR4-2133/2400	DIMM DDR5-4400
RAM slots	2	4
RAM speed	2400 MT/s	4400 MT/s
RAM max	16 GB	128 GB
USB ports	(2x) USB-A 3.0; (4x) USB-A 2.0;	(4x) USB-A 2.0; (3x) USB-A 3.0; (2x) USB-A 3.1; USB-C 3.2
Video ports	HDMI 1.2; VGA;	(3x) Display Port 1.4a;
Other ports	RJ45; Hdph; Mic; Line-Out; Line-In; Card Reader;	RJ45(2.5GHz); Audio; Line-Out/In;
Optional ports	N.A.	HDMI 2.0b/Displayport/VGA/PS2/serial/USB Type-C 3.1; Serial port; SD-card slot
SATA ports	5	4
PCI slots	PCIe 2.0 x16; (2x) PCIe 2.0 x1;	PCIe 4.0 x16; PCIe 3.0 x4;PCIe 3.0 x1; PCI-32;
M.2 slots	M.2 2230 (WiFi/BT)	M.2 2230/2280 (PCIe 4.0 x4, NVMe); M.2 2230 (WiFi/BT)
Drive bays	(2x) 2.5in; 3.25in; 9.5mm	(x2) 3.5in
PSU	240 W	260/500 W
Weight	5.90 kg (13.01 lb)	9.63 kg (21.24 lb)
Released	2016	2024
Manual	link	link
Price**	Check Price	Check 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 Inspiron 3668 and Dell OptiPlex Tower Plus 7020 2024

If you are looking for a more modern desktop, then you should go with the Dell OptiPlex Tower Plus 7020 2024 which was released in 2024. The Dell Inspiron 3668 is older and entered production in 2016.

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 Tower Plus 7020 2024 as it is running a newer generation CPU. This is not to say that Dell Inspiron 3668 is bad - it can still run some powerful CPUs, albeit being an older generation.

Memory

The Dell OptiPlex Tower Plus 7020 2024 has 4 RAM slots while the Dell Inspiron 3668 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 Tower Plus 7020 2024 is using the faster 4400 MT/s RAM. The Dell Inspiron 3668 is slower by supporting RAM speeds of up to 2400 MT/s. Additionally, if you will be needing a lot of RAM, better go for the Dell OptiPlex Tower Plus 7020 2024 as it has the ability to run 128 GB of RAM. The Dell Inspiron 3668 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 Tower Plus 7020 2024 has 10 USB ports. The Dell Inspiron 3668 is inferior in this regard and packs 6 USB ports. In any case, if you miss USB ports, you can always purchase a USB hub. What is nice about the Dell OptiPlex Tower Plus 7020 2024, is that it has 2 USB 3.1 port(s) which allows transfer of up to 10Gb/s. Unfortunately, the Dell Inspiron 3668 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.

Unfortunately, only the Dell OptiPlex Tower Plus 7020 2024 has a DisplayPort. The Dell Inspiron 3668 does not have one? Don't worry though, nowadays video adapters are cheap and you can get almost any combination of conversion types.

The Dell Inspiron 3668 comes with an HDMI port, while the Dell OptiPlex Tower Plus 7020 2024 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 Inspiron 3668 is better equipped as it comes with 5 SATA slot(s), while the Dell OptiPlex Tower Plus 7020 2024 has 4 slot(s).

If you want the fastest transfer speeds for your SSD, an M.2 interface is crucial. Thus, if the M.2 SSD slot is a mandatory requirement for you, go with the Dell OptiPlex Tower Plus 7020 2024. Sadly, the Dell Inspiron 3668 has no such slot, and you will be forced to use the SATA interface instead.

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 Inspiron 3668 comes with a decent 240 Watt PSU, but the Dell OptiPlex Tower Plus 7020 2024 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.