Alienware X51 R2 vs. Dell OptiPlex 7090 M

Comparison and Differences

Alienware_X51_R2.jpg case front and back pannelDell_OptiPlex_7090_M.jpg case front and back pannel
Model
Form factorSmall GamingMicro
CPU optionsIntel Gen4 i3/i5/i7;Intel Gen10&11 i3/i5/i7/i9;
ChipsetH87Q570
Dedicated GPU *GeForce GTX 1650 SuperN.A.
RAMDIMM DDR3-1600 SODIMM DDR4-2666/2933/3200
RAM slots22
RAM speed1600 MT/s3200 MT/s
RAM max16 GB64 GB
USB ports(6x) USB 3.0 Type A; (2x) USB-A 2.0; USB 3.2 Type C; (3x) USB-A 3.1; (x2) USB-A 3.0;
Video portsHDMI 1.4b;(2x) Display Port 1.4; (2x) mini Display Port 1.4;
Other portsRJ45; Headset; Line-Out; Line-In; S/PDFI optical/analog;RJ45; Audio; Line-Out/In;
Optional portsN.A.Serial; PS2 port; VGA port; DisplayPort 1.4/HDMI 2.0/USB 3.2 Gen2 Type-C
SATA ports30
PCI slotsPCIe 3.0 x16;N.A.
M.2 slotsN.A.M.2 2280/2230 M-key (PCIe 3.0 x4, NVMe); M.2 2280/2230 M-key (PCIe); M.2 2230 (WiFi/BT)
Drive bays(2x) 2.5in; 3.25in; 5.25in;2.5in
PSU240/330 W90/130/180 W
Weight5.49 kgs (12.10 lbs)1.38 kg (3.05 lbs)
Released20132021
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 Alienware X51 R2 and Dell OptiPlex 7090 M

If you are looking for a more modern desktop, then you should go with the Dell OptiPlex 7090 M which was released in 2021. The Alienware X51 R2 is older and entered production in 2013.

If you are looking for the smaller form factor the Dell OptiPlex 7090 M is the right one for you. It is smaller than the Alienware X51 R2 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 OptiPlex 7090 M as it is running a newer generation CPU. This is not to say that Alienware X51 R2 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.

The Dell OptiPlex 7090 M is using the faster 3200 MT/s RAM. The Alienware X51 R2 is slower by supporting RAM speeds of up to 1600 MT/s. Additionally, if you will be needing a lot of RAM, better go for the Dell OptiPlex 7090 M as it has the ability to run 64 GB of RAM. The Alienware X51 R2 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 Alienware X51 R2 has 8 USB ports. The Dell OptiPlex 7090 M 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 7090 M, is that it has 1 USB 3.1 port(s) which allows transfer of up to 10Gb/s. Unfortunately, the Alienware X51 R2 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 7090 M comes with 2 ports, while the Alienware X51 R2 has only 1. If you are planning to use multiple monitors, the Dell OptiPlex 7090 M is the better choice.

None of the models has an HDMI port. If your monitor supports only the HDMI interface, you will need to buy an adapter. Such adapters are cheap so nothing to worry about.

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 Alienware X51 R2 is better equipped as it comes with 3 SATA slot(s), while the Dell OptiPlex 7090 M has 0 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 7090 M. Sadly, the Alienware X51 R2 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 OptiPlex 7090 M comes with a decent 180 Watt PSU, but the Alienware X51 R2 has a more powerful one rated at 330 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

Alienware_X51_R2_motherboard.jpg motherboard layoutDell_OptiPlex_7090_M_motherboard.jpg motherboard layout