Optiplex 755 Processor Upgrade

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Optiplex 755 Processor Upgrade

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I'm looking to squeeze a couple more years out of the 755 I use at my office, and I have some upgrade questions. It is a mini tower configuration with a Q6600 processor. Is there a chart that shows what processors can be used with the 0GM819 mobo? Will motherboards from any other series fit the 755 chassis?

 

Verified Answer
  • Chart.

    No other motherboards do not fit nor do they work with the ribbon cable to the front panel.

    After updating to the latest bios I would say up to 45nm Q9650 for the Mini Tower.

    You would have to make sure that you get PC6400 DDR2 Ram if you do that.

    UPDATE THE BIOS BEFORE trying to install a newer processor.

    10/26/2011  2:11 AM      2239507 O755-A20.exe

    The Dell spec for the desktop version lists the Q6600, Q9450, and Q9550 CPUs.
    http://www.dell.com/downloads/global/products/optix/en/opti_755_techspecs.pdf

    The Q9650 worked in my minitower bios A20.

    Report Unresolved Customer Service Issues here

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    The forum is primarily user to user, with Dell employees moderating.

  • The Crucial Kits are the exact ram I chose.

    Report Unresolved Customer Service Issues here

    I do not work for Dell. I too am a user.

    The forum is primarily user to user, with Dell employees moderating.

All Replies
  • Chart.

    No other motherboards do not fit nor do they work with the ribbon cable to the front panel.

    After updating to the latest bios I would say up to 45nm Q9650 for the Mini Tower.

    You would have to make sure that you get PC6400 DDR2 Ram if you do that.

    UPDATE THE BIOS BEFORE trying to install a newer processor.

    10/26/2011  2:11 AM      2239507 O755-A20.exe

    The Dell spec for the desktop version lists the Q6600, Q9450, and Q9550 CPUs.
    http://www.dell.com/downloads/global/products/optix/en/opti_755_techspecs.pdf

    The Q9650 worked in my minitower bios A20.

    Report Unresolved Customer Service Issues here

    I do not work for Dell. I too am a user.

    The forum is primarily user to user, with Dell employees moderating.

  • Okay, thanks!

    As for the processor suggestion, is there a specific reason for the Q9550 as opposed to the Q9650 or one of the QX9xxx?

  • Q9650 works but I don't know about the power in a SFF or SDT.   Q9650 in SMT BIOS A20  = TOWER version does work YMMV.

    In the USFF Forget it because It WILL NOT work due to the power brick being only 150W.

    Surprise

    ALWAYS UPDATE BIOS BEFORE installing New Ram and New Processor or you will drive yourself crazy

    trying to figure out which piece is broken.

    PC6400 ram is required for the 1333mhz fsb CPU's

    Report Unresolved Customer Service Issues here

    I do not work for Dell. I too am a user.

    The forum is primarily user to user, with Dell employees moderating.

  • I had planned on upgrading to 8GB of PC8500 with 2 4Gb kits form Crucial.

    www.crucial.com/.../mpartspecs.aspx

    It is the tower configuration, and my BIOS is at A20 already.

    Thanks Again!

  • The Crucial Kits are the exact ram I chose.

    Report Unresolved Customer Service Issues here

    I do not work for Dell. I too am a user.

    The forum is primarily user to user, with Dell employees moderating.

  • Why is DDR2 PC2-6400 RAM modules required with 1333 FSB C2D's?

    Does it multifunction with DDR2 PC2-5300 RAM modules?

    What is the best ram for C2D'S 1066 FSB?

  • Required Ram is based on Front Side Bus.

    If your Front Side Bus is 800mhz then you need PC2-6400.  DDR2 PC2-3200/4200  is NOT Supported in ANY configuration.

    They recommend DDR2-800 so that you will not have a CPU that has an issue with the FSB.  Keep in Mind that the VIDEO clock

    minimum speed is 333 mhz and that system ram is shared with INTEL Graphics.

    Motherboard is capable of clocking memory not only as DDR2-533, DDR2-667 and DDR2-800 but also as DDR2-1066 at a FSB frequency of 266MHz.

    4GB kit (2GBx2), 240-pin DIMM, DDR2 PC2-8500 memory module

    4GB kit (2GBx2), 240-pin DIMM, DDR2 PC2-8500 memory module
    Part Number: CT798861
    • Module Size: 4GB kit (2GBx2)
    • Package: 240-pin DIMM
    • Feature: DDR2 PC2-8500
    • Specs: DDR2 PC2-8500 • CL=7 • Unbuffered • NON-ECC • DDR2-1066 • 1.8V • 256Meg x 64 •
    Guaranteed-compatible with the Dell OptiPlex 755 Series (Desktop Mini-Tower and Small Form Factor)
    Standard name

     

    Memory clock

    (MHz)

    Cycle time

    (ns)

    I/O bus clock

    (MHz)

    Data rate

    (MT/s)

    Module name

     

    Peak transfer rate

    (MB/s)

    (CL-tRCD-tRP)


    (ns)

    DDR2-400B
    DDR2-400C
    100 10 200 400 PC2-3200 3200 3-3-3
    4-4-4
    15  
    20  
    DDR2-533B
    DDR2-533C
    133⅓ 266⅔ 533⅓ PC2-4200 4266⅔ 3-3-3
    4-4-4
    11¼
    15  
    DDR2-667C
    DDR2-667D
    166⅔ 6 333⅓ 666⅔ PC2-5300 5333⅓ 4-4-4
    5-5-5
    12  
    15  
    DDR2-800C
    DDR2-800D
    DDR2-800E
    200 5 400 800 PC2-6400 6400 4-4-4
    5-5-5
    6-6-6
    10  
    12½
    15  
    DDR2-1066E
    DDR2-1066F
    266⅔ 533⅓ 1066⅔ PC2-8500 8533⅓ 6-6-6
    7-7-7
    11¼
    13⅛

    Report Unresolved Customer Service Issues here

    I do not work for Dell. I too am a user.

    The forum is primarily user to user, with Dell employees moderating.

  • Uff, exhausting answer. Thank you very much for that. It makes perfect sense and I can report to my boss with confidence how to upgrade our PC's.Big Smile