Dell OptiPlex 7040 SFF vs. HP ProDesk 400 G3 SFF

Comparison and Differences

Dell_OptiPlex_7040_SFF.jpg case front and back pannelHP_ProDesk_400_G3_SFF.jpg case front and back pannel
ModelDell OptiPlex 7040 SFFHP ProDesk 400 G3 SFF
Form factorSmallSmall
CPU optionsIntel Gen6 i3/i5/i7Intel Gen6 i3/i5/i7; Celeron; Pentium;
ChipsetQ170H110
Dedicated GPU *GeForce GT 1030 Low ProfileGeForce GT 1030 Low Profile
RAMDIMM DDR4-2133 DIMM DDR4-2133
RAM slots42
RAM speed2133 MT/s2133 MT/s
RAM max64 GB32 GB
USB ports(6x) USB-A 3.0; (4x) USB-A 2.0; (4x)USB-A 3.0; (4x)USB-A 2.0;
Video ports(2x) Display Port 1.2; HDMI 1.4;DisplayPort; VGA;
Other portsSerial; (2x) PS2; RJ45; Headset; Line-Out; RJ45; Hdph; Mic; Line-Out; Line-In; Serial; (2x) PS2;
Optional portsVGA; Media Card Reader;SD card reader; Serial; Parallel;
SATA ports32
PCI slotsPCIe 3.0 x16; PCIe 3.0 x4;PCIe 3.0 x16; PCIe 2.0 x1;
M.2 slotsM.2 2280 M-key (PCIe 3.0 x4, SATA 3.0) N.A.
Drive bays3.5-inch/(2x)2.5-inch; 5.25-inch (slim); 3.5-inch; 5.25-inch (slim)
PSU180 W180 W
Weight6.00 kg (13.22 lb)4.43 kg (9.8 lb)
Released20152016
Manuallinklink
* 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 7040 SFF and HP ProDesk 400 G3 SFF

If a more modern desktop is what you are looking for, then you should go with the HP ProDesk 400 G3 SFF which was released in 2016. The Dell OptiPlex 7040 SFF is older and entered production in 2015.

Form factor wise the models are the same - both desktops are of similar size and form.

Processor

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

Memory

The Dell OptiPlex 7040 SFF has 4 RAM slots while the HP ProDesk 400 G3 SFF 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.

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 2133. Additionally, if you will be needing a lot of RAM, better go for the Dell OptiPlex 7040 SFF as it has the ability to run 64 GB of RAM. The HP ProDesk 400 G3 SFF can do a bit less at max 32 GB. Most of the times, this should be sufficient for most users.

Ports

In total the Dell OptiPlex 7040 SFF has 10 USB ports. The HP ProDesk 400 G3 SFF is inferior in this regard and packs 8 USB ports. None of the desktop models has a USB 3.1 port (10Gb/s), so if you need a fast connection to your peripherals you will need to look at other models.

DisplayPort is crucial for any desktop machine. It is good to see that both models are featuring DisplayPorts. However, the Dell OptiPlex 7040 SFF comes with 2 ports, while the HP ProDesk 400 G3 SFF has only 1.

The Dell OptiPlex 7040 SFF comes with an HDMI port, while the HP ProDesk 400 G3 SFF 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 port 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 7040 SFF is better equipped as it comes with 3 SATA 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 7040 SFF. Sadly, the HP ProDesk 400 G3 SFF has no such slot, and you will be forced to use the SATA interface instead.

Remark: Make sure that the M.2 slot supports the PCIe (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 6 Gb/s, while the PCIe 3.0 x4 will support speeds up to 32 Gb/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 180 Watts. Howver 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 option.

Motherboard

Dell_OptiPlex_7040_SFF_motherboard.jpg motherboard layoutHP_ProDesk_400_G3_SFF_motherboard.jpg motherboard layout

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