Dell OptiPlex 3040 MT vs. Dell Vostro 3900g

Comparison and Differences

Dell_OptiPlex_3040_MT.jpg case front and back pannelDell_Vostro_3900g.jpg case front and back pannel
Model
Form factorMini TowerMini Tower
CPU optionsIntel Gen6 i3/i5; Pentium; Celeron; Intel Gen4 i3/i5/i7; Pentium; Celeron;
ChipsetH110H81
Dedicated GPU *GeForce GTX 1650 SuperGeForce GTX 1660 Super
RAMDIMM DDR3L-1600 DIMM DDR3-1600
RAM slots22
RAM speed1600 MT/s1600 MT/s
RAM max16 GB16 GB
USB ports(4x) USB-A 3.0; (4x) USB-A 2.0; (6x)USB-A 2.0; (2x)USB-A 3.0;
Video ports Display Port 1.2; HDMI 1.4;HDMI 1.2; VGA;
Other portsRJ45; Headset; Line-Out; RJ45; Hdph; (2x) Mic; Line-Out; Line-In; PS2
Optional portsSerial+PS2; VGA; Media Card Reader;N/A
SATA ports34
PCI slotsPCIe 3.0 x16; (3x) PCIe 3.0 x1;PCIe 2.0 x16; (2x) PCIe 2.0 x1; PCI
M.2 slotsN.A.N.A.
Drive bays3.5in/5.25in; (2x) 2.5in; 5.25in slim;3.5in; 5.25in;
PSU240 W300 W
Weight7.93 kg (17.49 lb)8.50 kg (18.73 lbs)
Released20152014
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 3040 MT and Dell Vostro 3900g

If you are looking for a more modern desktop, then you should go with the Dell OptiPlex 3040 MT which was released in 2015. The Dell Vostro 3900g is older and entered production in 2014.

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 3040 MT as it is running a newer generation CPU. This is not to say that Dell Vostro 3900g is bad - it can still run some powerful CPUs, albeit being an older generation.

Memory

Both models have have equal amount of ram slots (2 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.

None of the desktops has an advantage when it comes to the speed of the RAM being used. Both models support RAM speeds of up to 1600. 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 8. 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.

Unfortunately, only the Dell OptiPlex 3040 MT has a DisplayPort. The Dell Vostro 3900g 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 Vostro 3900g is better equipped as it comes with 4 SATA slot(s), while the Dell OptiPlex 3040 MT 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 3040 MT, nor the Dell Vostro 3900g 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 3040 MT comes with a decent 240 Watt PSU, but the Dell Vostro 3900g has a more powerful one rated at 300 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_3040_MT_motherboard.jpg motherboard layoutDell_Vostro_3900g_motherboard.jpg motherboard layout