DDR2 Upgrade for the HP - Compaq dc5800 Series (All form factors) Desktop/PC

Crucial Community Forum

The fastest way to get answers to your technical support or customer service questions. Register now to be part of the Crucial online community, so you can search for the information you need.

Live Chat

Hours (MST):
Monday - Friday: 7am - 6pm
Saturday: 8am - 2 pm

Send us an e-mail

For the most immediate feedback, use our Live Chat. Chat hours are 7 a.m. to 6 p.m. (MST) Monday-Friday and 8 a.m. to 2 p.m. Saturday.

Toll-free for US and Canada


Toll-free for Australia and New Zealand

Hours (MST):
Monday - Friday: 7am - 6pm
Saturday: 8am - 2 pm (chat only)

Share or ask for feedback from your Facebook friends.

  Get a friend's opinion.

device type: desktop

Your dc5800 Series (All form factors) System Specs

System specs as shipped by the manufacturer.
Scan your system to view your specific system configuration.


DDR2 PC2-6400

Memory Type: DDR2 PC2-6400, DDR2 (non-ECC)
Maximum Memory: 8GB
Slots: 4

Although the memory can be installed one module at a time, the best performance comes from using matched pairs of modules.

How much memory your Windows OS will recognize depends on which version of Windows you are running. 32-bit versions of Windows will see (and utilize) only 3GB or 3.5GB. To utilize more memory, install a 64-bit version of your OS. More information about OS memory maximums can be found here.

Memory or DRAM is the "working" memory of the computer. It's used to store data for programs (sequences of instructions) on a temporary basis.

video - installing memory


SATA 2 - 3Gb/s

SATA Version -- SATA 2 - 3Gb/s

Storage Drives -- hard drives and solid state drives -- are the permanent memory for the programs and documents on your computer.

Data Transfer Rate is the rate at which data can be sent or received. This is determined by your motherboard. A drive with a higher transfer rate will only run at the rate of the motherboard's transfer rate.

Cache is a type of working memory that allows the drive to perform faster.

RPM is the rotations per minute of a hard drive which effects the speed of data transfer.

Solid State Drives are non-moving memory, so access speed is instant.


Intel Q33 chipset

Chipset is a set of integrated circuits that have a specific purpose in a computer system, a group of microchips used together to perform a single task.

2GB, 240-pin DIMM, DDR2 PC2-6400 memory module

2GB, 240-pin DIMM, DDR2 PC2-6400 memory module
Part Number: CT788661
  • Module Size: 2GB
  • Package: 240-pin DIMM
  • Feature: DDR2 PC2-6400
  • Specs: DDR2 PC2-6400 • CL=6 • Unbuffered • NON-ECC • DDR2-800 • 1.8V • 256Meg x 64 •
    What does this mean?
Guaranteed-compatible with the HP - Compaq dc5800 Series (All form factors)


by PowerReviews
Crucial2GB Upgrade for a HP - Compaq dc5800 Microtower System

(based on 2 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Reviewed by 2 customers

Sort by

Displaying reviews 1-2

Back to top


Check your OS 1st to get ultimate result

By Brenda Blueprints

from Allison Park, PA

About Me Power user

Verified Buyer



      Best Uses

      • Increased Performance

      Comments about Crucial 2GB Upgrade for a HP - Compaq dc5800 Microtower System:

      Be sure to check the OS details, it matters! We failed to check and then discovered I'm already running at ultimate memory based on the operating system. Now we need to upgrade my OS in order to utilize the memory upgrade.

      I also increased my personal laptop memory 2gb, but I checked the OS details first to ensure I would reap the benefit I was seeking. WOW, what a HUGE difference! I'm going to upgrade my kids' laptops now so I can actually use mine again. Well worth it, but check the OS details first!

      • Primary use:
      • Business

      Perfection in a company

      By KnowALLage

      from New Bedford, MA 02744

      About Me Power user

      Verified Buyer


      • Large Capacity
      • Reliable Performance


        Best Uses

        • Increased Performance
        • Multimedia
        • Multiple desktop applications

        Comments about Crucial 2GB Upgrade for a HP - Compaq dc5800 Microtower System:

        I always get the right part and it always ends up working perfectly! Thanks!

        • Primary use:
        • Personal

        Displaying reviews 1-2

        Back to top

        Why doesn't Windows recognize all of my memory?
        What is a memory Rank?
        1.35v - 1.5v Dual-Voltage DDR3 memory
        How do I know what kind of memory to purchase?
        Virtual Memory - Settings and Suggestions
        Instability with tactical tracers on gigabyte mobo
        Slow with More Memory
        RAM problems with ASrock 970 extreme4
        RAM arrangement, 2 different speeds
        Types of DRAM