Dell Inspiron 3668 vs. Dell OptiPlex 7040 MT

Comparison and Differences

Dell_Inspiron_3668.jpg case front and back pannelDell_OptiPlex_7040_MT.jpg case front and back pannel
ModelDell Inspiron 3668Dell OptiPlex 7040 MT
Form factorMini TowerMini Tower
CPU optionsIntel Gen6 i3/i5/i7; Celeron; Pentium;Intel Gen6 i3/i5/i7
ChipsetH110Q170
Dedicated GPU *GeForce GTX 1650 SuperGeForce GTX 1650 Super
RAMDIMM DDR4-2133/2400DIMM DDR4-2133
RAM slots24
RAM speed2400 MT/s2133 MT/s
RAM max16 GB64 GB
USB ports(2x) USB-A 3.0; (4x) USB-A 2.0;(6x) USB-A 3.0; (4x) USB-A 2.0;
Video portsHDMI 1.2; VGA;(2x) Display Port 1.2; HDMI 1.4;
Other portsRJ45; Hdph; Mic; Line-Out; Line-In; Card Reader;Serial; (2x) PS2; RJ45; Headset; Line-Out;
Optional portsN.A.VGA; Media Card Reader;
SATA ports54
PCI slotsPCIe 2.0 x16; (2x) PCIe 2.0 x1;PCIe 3.0 x16; PCIe 3.0 x16 (wired x4); PCIe 3.0 x1; PCI;
M.2 slotsM.2 2230 (WiFi/BT)M.2 2280 M-key (PCIe 3.0 x4, SATA 3.0)
Drive bays(2x) 2.5in; 3.25in; 9.5mm3.5in/5.25in; (2x) 2.5in; 5.25in (slim);
PSU240 W240 W
Weight5.90 kg (13.01 lb)8.00 kg (17.64 lb)
Released20162015
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 Inspiron 3668 and Dell OptiPlex 7040 MT

If you are looking for a more modern desktop, then you should go with the Dell Inspiron 3668 which was released in 2016. The Dell OptiPlex 7040 MT is older and entered production in 2015.

Form factor wise the models are the same. This means that they are of similar size and form.

Processor

The two models have the same generation of Intel processors. We think that the 6 generation of Intel Processors have enough power to execute all of the home and office tasks that most people will care to do.

Memory

The Dell OptiPlex 7040 MT has 4 RAM slots while the Dell Inspiron 3668 has only 2 slot(s). Of course this is not something to worry about. Just make sure you take it into consideration when planning how much RAM will your system be using.

The Dell Inspiron 3668 is using the faster 2400 MT/s RAM. The Dell OptiPlex 7040 MT is slower by supporting RAM speeds of up to 2133 MT/s. Additionally, if you will be needing a lot of RAM, better go for the Dell OptiPlex 7040 MT as it has the ability to run 64 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 7040 MT 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. 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.

Unfortunately, only the Dell OptiPlex 7040 MT 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.

In case your monitor supports HDMI only, you will be happy to hear that both models come with an HDMI port.

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 7040 MT has 4 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

Looking at the Power Supply Unit (PSU) of the two models we don't see any differences. For either of them you get a maximum power of 240 Watts. However be careful, many models have more than one power supply option. When buying your computer, it is a good idea to get a version with the most powerful PSU. This will potentially allow you to upgrade to a more powerful GPU for example.

Motherboard

Dell_Inspiron_3668_motherboard.jpg motherboard layoutDell_OptiPlex_7040_MT_motherboard.jpg motherboard layout

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