Alienware Area 51 R5 vs. Lenovo ThinkCentre M900 Tower

Comparison and Differences

Alienware_Area_51_R5.jpg case front and back pannel

Lenovo_ThinkCentre_M900_Tower.jpg case front and back pannel

Model
Form factor	Mid Tower	Mini Tower
CPU options	Intel Gen7&9&10 Core X-series	Intel Gen6 i3/i5/i7; Celeron; Pentium;
Chipset	X299 PCH	Q170
Dedicated GPU *	GeForce RTX 3090	GeForce GTX 1660 Super
RAM	DIMM DDR4-2666/3200	DIMM DDR4-2133
RAM slots	4	4
RAM speed	3200 MT/s	2133 MT/s
RAM max	64 GB	64 GB
USB ports	(9x) USB 3.0 Type A; (2x) USB-A 2.0; USB 3.1 Type C; USB 3.1 Type A;	(8x)USB-A 3.0;
Video ports	N/A	(2x) DisplayPort 1.2; VGA;
Other ports	RJ45; Headset; Line-Out; Line-In; S/PDFI optical; Card Reader;	RJ45; Hdph; (2x) Mic; Line-Out; Line-In; Serial;
Optional ports	N.A.	2x USB-A 2.0; Media card reader (USB 2.0); (2x) PS2; eSATA;
SATA ports	4	3
PCI slots	(x3) PCIe 3.0 x16; (x2) PCIe 3.0 x8; PCIe 3.0 x4;	PCIe 3.0 x16; PCIe 3.0 x1; PCIe 3.0 x16 (wired x4); M2 to PCI adapter (optional);
M.2 slots	M.2 2230 (WiFi/BT); M.2 2280 M-key (PCIe 3.0 x2, NVMe);	M.2 (WiFi/BT or PCI extension card)
Drive bays	(2x) 2.5in; (x3) 3.25in;	(2x) 2.5/3.5in; (2x) 5.25in;
PSU	850/1500 W	ATX 250/400 W
Weight	28 kg (61.73 lbs)	12.5 kg (27.5 lb)
Released	2015	2015
Manual	link	link
Price**	Check Price	Check 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 Area 51 R5 and Lenovo ThinkCentre M900 Tower

Both computers, the Alienware Area 51 R5 and the Lenovo ThinkCentre M900 Tower, were released during the same year - 2015.

If you are looking for the smaller form factor the Alienware Area 51 R5 is the right one for you. It is smaller than the Lenovo ThinkCentre M900 Tower 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 Alienware Area 51 R5 as it is running a newer generation CPU. This is not to say that Lenovo ThinkCentre M900 Tower 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 Alienware Area 51 R5 is using the faster 3200 MT/s RAM. The Lenovo ThinkCentre M900 Tower is slower by supporting RAM speeds of up to 2133 MT/s. In addition, you will be able to install the same amount of RAM in both models, and most probably 64 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

In total the Alienware Area 51 R5 has 13 USB ports. The Lenovo ThinkCentre M900 Tower is inferior in this regard and packs 8 USB ports. In any case, if you miss USB ports, you can always purchase a USB hub. What is nice about the Alienware Area 51 R5, is that it has 2 USB 3.1 port(s) which allows transfer of up to 10Gb/s. Unfortunately, the Lenovo ThinkCentre M900 Tower 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.

Unfortunately, only the Lenovo ThinkCentre M900 Tower has a DisplayPort. The Alienware Area 51 R5 does not have one? Don't worry though, nowadays video adapters are cheap and you can get almost any combination of conversion types.

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 Area 51 R5 is better equipped as it comes with 4 SATA slot(s), while the Lenovo ThinkCentre M900 Tower has 3 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 Alienware Area 51 R5. Sadly, the Lenovo ThinkCentre M900 Tower 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 Lenovo ThinkCentre M900 Tower comes with a decent 400 Watt PSU, but the Alienware Area 51 R5 has a more powerful one rated at 1500 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.