OptiPlex 755 – Windows 7 and 10 64 Bit

It is not advised to spend too much money upgrading this over a decade 2007 system, as it is cheaper to purchase a more capable Second Hand Business Desktop than a new OS License. This PC can run Windows 7 64 Bit pretty well. It can run Windows 10 64 Bit if this PC has enough RAM (>4 GB) and a SSD. Without the SSD it may run but poorly as the Hard Drive is cranked up to continuous 100 % Disc Usage.

Minitower, Desktop, SFF, USFF

System Upgrades

Service Manual

Dell Service Manual

Memory Upgrade:

This system supports 8 GB of RAM 2×(2×2 GB Modules) or 4 GB for the USFF (2×2 GB Modules)

amazon.com Crucial CT2KIT25664AA800

amazon.co.uk Crucial CT2KIT25664AA800

Solid State Drive 3.5 “

Upgrading to a Solid State Drive

Graphics Card

No Low Profile Bracket is required for the Minitower. Card will not fit into the USFF:

amazon.com HD5450 Graphics Card

amazon.com Low Profile Adaptor Needed for the Desktop and SFF models

amazon.co.uk HD5450 Graphics Card

amazon.co.uk Low Profile Adaptor Needed for the Desktop and SFF models

Legacy BIOS

Windows 10

If you have previously bought a Windows 7 Retail or Windows 8.x Retail License then your key will work with Windows 10. If you were an early adopter and had activated your system with Windows 10 Insider Build 10130 you can clean install Windows 10 Pro without a Product Key.

I advise installing Windows 10 without a Product Key before buying a License which will give you time to evaluate it. With Windows 10 there is no trial, instead your Desktop and Settings will be watermarked and you will be unable to personalise some user settings but otherwise it’ll be fully functional. You can also activate Windows 10 with a Windows 7 Key or Windows 8.x Key.

OS Updates

System Utilities




Most of these systems won’t have a modem.



Follow instructions here for using the Microsoft Update Catalog then follow instructions here for driver installation via the device manager.

Card Reader

Dell Media Card Reader with Integrated Bluetooth Module (CAB-200), Media Card
Reader 19-1 with Integrated Bluetooth*

Not all units have a card reader.



9 thoughts on “OptiPlex 755 – Windows 7 and 10 64 Bit

  1. Great post, but I need help on the graphics driver since the AMD autodetect cannot identify my video card. TIA

  2. Everything in my Dell Optiplex 755 works with Win10, except for the Analog Devices audio.
    I’ve tried several different driver versions; all of those worked with Windows7.
    Anyone more success with Win10, other than installing another soundcard?

      1. I have a dell optiplex 755 and i had changed hard disk of 320 Gb, but i can´t install w7 o w10, when i am trying install the OS, don´t accept the drivers AHCI, i will like if possible than somebody give one image ISO for my pc. Thanks.

      2. Win7 and Win10 are far more up to date than that system and have the SATA preinstallation drivers required inbuilt.

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