Dell OptiPlex 790 Specs

Dell-optiplex-790
Source: Dell

There exists a multitude of desktop brands and models. Hence, it might be overwhelming for you to choose a computer for your business or home.

That’s why we are reviewing some of our favorite computers we recommend you buy.

What is the Dell OptiPlex 790?

Dell’s range of OptiPlex desktops has made waves in the PC market. They are well-known in gaming circles as budget-friendly gaming desktops that come with powerful processors that are hard to find elsewhere at the same price range.

The OptiPlex 790 is a business-grade desktop that shares the same in-demand qualities that have made other OptiPlex desktops popular. Its features include:

• Long Lifespan
• Easily Detachable Components
• Powerful Computing
• Ergonomic Design
• Business-Grade Control & Security

Moreover, its business-oriented technologies and build simplify IT management and control.

It boasts top-notch security implementations for business and personal data safety. Security features like:

• Trusted Platform Module 1.2
• Dell Data Protection/Access
• I/O Interface Security
• Intel Trusted Execution Technology
• Chassis Intrusion Switch (optional)

Dell OptiPlex 790: Design

At first glance, the Dell OptiPlex 790 may seem to be one of the smallest business-grade PCs, but the internal horsepower says otherwise. The chassis is solidly built with sturdy metal sheets painted in light and gray metal colors. In addition, the plastic extras are made from recycled plastic that meets EPEAT Gold Standards. Therefore, you can rest assured that it can handle most scuffs and scratches you throw at it.

The front face of the CPU has four USB ports, audio 3.5mm jacks, and an optical DVD-ROM that is SATA connected. If you want to see the insides, the side panel gives you access to the DDR3 RAM slots, the hard drive, and the processor.

The 790’s design is environment-responsible and its chassis is amongst the smallest in their respective categories. In addition, the small form factor, desktop, and mini-tower can blend seamlessly into almost any home or office environment.

Dell OptiPlex 790: Performance


In terms of performance, the 790 gives it’s much larger competition a run for its money. For your Intel processor, you have three options, which are the i7, i5, or the i3. Our test unit came with the best – an i7 2nd Gen processor.

In the graphics department, the OptiPlex 790 comes with the Integrated Intel® HD Graphics 2000 by default. However, integrated graphics cards compete for system resources with the processor thereby bottlenecking performance.

Therefore, in light of this, Dell also gives you an option to purchase a model armed with a discrete graphics card. The discrete graphics card options are:

  • 1GB AMD RADEON 6450.
  • 512MB AMD RADEON 6350.

In the storage department, the 790 is outfitted with either a 3.5” hard drive or a 2.5” one. The 3.5” SATA connection can have up to 1TB at 7200 RPM and at 3.0GB/s. In contrast, the 2.5” version comes in various options. It can be a:

  • 500GB SATA HDD.
  • 500GB HYBRID
  • 128 SSD
  • ETC.

When it comes to memory, the 790 has four DIMM slots that can each support up to 4GB of memory sticks for a total of 16GB of RAM. 16 GigaBytes of RAM is more than enough for most computing tasks, regardless if it’s for productivity, CAD, office, or gaming.

The above serves to demonstrate the high customizability of the OptiPlex 790. Here is a brief specifications summary of our test unit OptiPlex 790 SFF.

Processor: Intel Core i7 2nd Gen @3.1 GHz
Graphics: Integrated Intel® HD Graphics 2000
Storage: 128GB SSD
RAM: 8GB RAM
Operating System: Windows 10 Pro x64

No doubt, our test unit was not the best OptiPlex 790 out there, but we still enjoyed a decent performance from it. We smoothly played a few games, like Far Cry 3, albeit at medium resolution and settings. However, if we had powerful discrete graphics from NVIDIA or AMD, I’m sure we could play most games at 1080p settings.

Source: Dell

Dell OptiPlex 790: Form Factors and Motherboard

Like its cousin, the Dell OptiPlex 9010, etc., the Dell OptiPlex 790 is available in four main sizes, which are:

  • Ultra Small Form Factor (USSF)
  • Small Form Factor (SFF)
  • Desktop
  • Mini-Tower (MT)

The size of the motherboard varies according to the size of the computer case AKA chassis. A bigger motherboard has more room for additional components.

For example, the USFF’s motherboard only has one mini PCIe connector, whereas the Desktop has one half-height PCIe x16 connector, a half-height PCIe (wired x 4) connector, a half-height PCIe x1 connector, and a half-height PCI connector.

Here is the rundown of each case size and its corresponding motherboard’s bays and expansion slots.

  • Ultra Small Form Factor (USFF): The smallest version of the OptiPlex 790. The motherboard has space only for a mini PCIe connector, a 2.5” internal bay, and a slimline external 5.25” hard drive bay.
  • Small Form Factor (SFF): The SFF, the second smallest 790, only has a 3.5” drive bay, an external slimline 5.25” drive bay, a half-height PCIe x16, and a half-height PCIe x16 (wired x 4).
  • Desktop: Slightly bigger than the SFF, the desktop has similar drive bays as the SFF. It has a 3.5” drive bay and an external slimline 5.25” drive bay. In the expansion slot area, it has a half-height PCIe x16 connector, a half-height PCIe (wired x 4) connector, a half-height PCIe x1 connector, and a half-height PCI connector.
  • Mini-Tower (MT): The biggest OptiPlex 790 with lots of room for cooling and extras. It has two 3.5” drive bays and another two 5.25” external drive bays. For expansion slots, it has one full-height PCIe x16, a full-height PCIe x16 (wired x 4), a full-height PCIe x1, and a full-height PCI.

Dell OptiPlex 790: Power Usage

By default, the Dell OptiPlex comes with a standard PSU with an efficiency below 90%. Though you still have the option to upgrade your OptiPlex 790 with a 90% efficient PSU (power supply unit) that ensures that you waste as little energy as possible. Moreover, the PSU’s high efficiency means you also save money on your utility/electricity bill.

Different form factors use different power supplies. For example, bigger chassis, like the mini-tower, use PSUs (power supply units) that use more power than smaller ones like the USFF.


Here is the wattage and efficiency of each form factor:

  • USFF: 200W up to 90% Efficient PSU, ENERGY STAR® 5.0 compliant, Active PFC.
  • SFF: 240W up to 90% Efficient PSU, ENERGY STAR® 5.0 compliant, Active PFC.
  • Desktop: 250W up to 90% Efficient PSU, ENERGY STAR® 5.0 compliant, Active PFC.
  • MT: 265W up to 90% Efficient PSU, ENERGY STAR® 5.0 compliant, Active PFC.

IMPORTANT NOTE: The OptiPlex 790 has a more efficient Active Power Factor Correction (APFC). However, according to Dell, to protect your hardware and for best results, you should use only a UPS (Universal Power Supply) or power source based on the sine wave.

Avoid using power supplies with an approximation of a sine wave, square wave, or quasi-square wave.

If you have more questions about power supplies, please contact Dell, the manufacturer, for assistance.

Dell OptiPlex 790: Specs

FeatureOptiPlex 790 Technical Specifications
ProcessorsIntel® 2nd Generation Core™ i7 Processors
Operating SystemMicrosoft® Windows 7®
FreeDOS for N-series
VideoIntegrated Intel® HD Graphics 2000
MemoryDDR3 SDRAM, up to 16GB
Hard Drive3.5” Hard Drives: up to 1TB
KeyboardsDell USB Entry Keyboard
MouseDell USB Optical Mouse
SecurityDell Data Protection / Access
Chassis lock slot support
Setup/BIOS Password
Environmental Standards
(eco-labels)
Energy Star 5.0
EPEAT Registered

Please visit the second page for more details.

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