Dell OptiPlex 7040 SFF vs. Dell XPS 8940

Comparison and Differences

Dell_OptiPlex_7040_SFF.jpg case front and back pannelDell_XPS_8940.jpg case front and back pannel
Model
Form factorSmallMini Tower
CPU optionsIntel Gen6 i3/i5/i7Intel Gen10 & 11 i3/i5/i7;
ChipsetQ170H470
Dedicated GPU *GeForce GT 1030 Low ProfileGeForce RTX 3080
RAMDIMM DDR4-2133 DIMM DDR4-2666/2933
RAM slots44
RAM speed2133 MT/s2666 MT/s
RAM max64 GB128 GB
USB ports(6x) USB-A 3.0; (4x) USB-A 2.0; USB 3.0 Type C; USB 3.1 Type A; (2x) USB-A 2.0; (7x) USB-A 3.0;
Video ports(2x) Display Port 1.2; HDMI 1.4;HDMI 2.0; DisplayPort 1.4;
Other portsSerial; (2x) PS2; RJ45; Headset; Line-Out; RJ45; Mic; Headset; Card Reader;
Optional portsVGA; Media Card Reader;N.A.
SATA ports33
PCI slotsPCIe 3.0 x16; PCIe 3.0 x4;PCIe 3.0 x16; PCIe x4; PCIe x1;
M.2 slotsM.2 2280 M-key (PCIe 3.0 x4, NVMe) M.2 2280/2230 M-key (PCIe 3.0 x4, NVMe); M.2 2230 (WiFi/BT);
Drive bays3.5in/(2x)2.5in; 5.25in (slim); (3x) 3.5in;
PSU180 W500 W
Weight6.00 kg (13.22 lb)6.3 kg (13.89 lb)
Released20152020
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 7040 SFF and Dell XPS 8940

If you are looking for a more modern desktop, then you should go with the Dell XPS 8940 which was released in 2020. The Dell OptiPlex 7040 SFF is older and entered production in 2015.

If you are looking for the smaller form factor the Dell OptiPlex 7040 SFF is the right one for you. It is smaller than the Dell XPS 8940 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 XPS 8940 as it is running a newer generation CPU. This is not to say that Dell OptiPlex 7040 SFF 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 XPS 8940 is using the faster 2666 MT/s RAM. The Dell OptiPlex 7040 SFF 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 XPS 8940 as it has the ability to run 128 GB of RAM. The Dell OptiPlex 7040 SFF can do a bit less at max 64 GB. Most of the times, this should be sufficient for the majority of users.

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. What is nice about the Dell XPS 8940, is that it has 1 USB 3.1 port(s) which allows transfer of up to 10Gb/s. Unfortunately, the Dell OptiPlex 7040 SFF 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.

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 Dell XPS 8940 has only 1. If you are planning to use multiple monitors, the Dell OptiPlex 7040 SFF is the better choice.

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

SATA slots are located on the motherboard and it is where SSD, HDD and Optical Disk Drives are connected. Each of the two models being compared have 3 SATA slot(s). Keep in mind that having too few SATA slots might limit your options for connecting additional memory drives.

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

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 7040 SFF comes with a decent 180 Watt PSU, but the Dell XPS 8940 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.

Motherboard

Dell_OptiPlex_7040_SFF_motherboard.jpg motherboard layoutDell_XPS_8940_motherboard.jpg motherboard layout