Dell Inspiron 3647 vs. Dell OptiPlex 7090 MT

Comparison and Differences

Dell_Inspiron_3647.jpg case front and back pannelDell_OptiPlex_7090_MT.jpg case front and back pannel
Model
Form factorSmallMini Tower
CPU optionsIntel Gen4 i3/i5/i7; Celeron; Pentium;Intel Gen10&11 i3/i5/i7/i9;
ChipsetH81 Q570
Dedicated GPU *GeForce GTX 1650 Low ProfileGeForce RTX 3070 (OEM)
RAMDIMM DDR3-1333/1600 DIMM DDR4-2666/2933/3200
RAM slots24
RAM speed1600 MT/s3200 MT/s
RAM max16 GB128 GB
USB ports(3x) USB-A 3.0; (6x) USB-A 2.0;USB 3.2 Type C; USB 3.1 Type C; (2x) USB-A 3.1; USB-A 3.0; (x4) USB-A 2.0;
Video portsHDMI 1.2; VGA;(4x) Display Port 1.4; (x3) HDMI 2.0b; VGA;
Other portsRJ45; Hdph; (2x) Mic; Line-Out; Line-In; 5.1 audio; Card Reader;RJ45; Audio; Line-Out/In; Serial; (x2) PS2
Optional portsN.A.USB Type-C (DP Alt Mode); Media Card Reader;
SATA ports24
PCI slotsPCIe 2.0 x16; PCIe 2.0 x1; mPCIe;PCIe 4.0 x16; PCIe 3.0 x4; PCIe 3.0 x1; PCIe-32
M.2 slotsN.A.M.2 2280/2230 M-key (PCIe 3.0 x4, NVMe); M.2 2230 M-key (PCIe); M.2 2230 (WiFi/BT)
Drive bays3.5in; 5.25in;(x2) 3.5in; (2x) 2.5in; 5.25in (slim);
PSU220 W260/300/369/500 W
Weight6.0 kg (13.22 lb)10.22 kg (22.53 lb)
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 Dell Inspiron 3647 and Dell OptiPlex 7090 MT

If you are looking for a more modern desktop, then you should go with the Dell OptiPlex 7090 MT which was released in 2021. The Dell Inspiron 3647 is older and entered production in 2013.

If you are looking for the smaller form factor the Dell Inspiron 3647 is the right one for you. It is smaller than the Dell OptiPlex 7090 MT 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 MT as it is running a newer generation CPU. This is not to say that Dell Inspiron 3647 is bad - it can still run some powerful CPUs, albeit being an older generation.

Memory

The Dell OptiPlex 7090 MT has 4 RAM slots while the Dell Inspiron 3647 has only 2 slot(s). This is not something to worry about. Just make sure you take it into consideration when planning how much RAM you are going to use.

The Dell OptiPlex 7090 MT is using the faster 3200 MT/s RAM. The Dell Inspiron 3647 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 MT as it has the ability to run 128 GB of RAM. The Dell Inspiron 3647 can do a bit less at max 16 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 9. If this is not enough, using a USB hub is always a viable option. What is nice about the Dell OptiPlex 7090 MT, is that it has 3 USB 3.1 port(s) which allows transfer of up to 10Gb/s. Unfortunately, the Dell Inspiron 3647 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 Dell OptiPlex 7090 MT has a DisplayPort. The Dell Inspiron 3647 does not have one? Don't worry though, nowadays video adapters are cheap and you can get almost any combination of conversion types.

The HDMI video interface is broadly used and the majority of the external displays support it. Thus, it is nice to see that both models have this video interface. If you are going to use multiple monitors go with the Dell OptiPlex 7090 MT which has 2 ports. The Dell Inspiron 3647 has only 1 ports.

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 OptiPlex 7090 MT is better equipped as it comes with 4 SATA slot(s), while the Dell Inspiron 3647 has 2 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 MT. Sadly, the Dell Inspiron 3647 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 Inspiron 3647 comes with a decent 220 Watt PSU, but the Dell OptiPlex 7090 MT 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_Inspiron_3647_motherboard.jpg motherboard layoutDell_OptiPlex_7090_MT_motherboard.jpg motherboard layout