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Which CPU's will A Dell GX280 MB ser # CN-OH726 support

I replaced a damaged power supply and Motherboard on my Dell Optiplex GX280 P4 3.6GHz Mini-tower. The 4 prong 12V power connector had a fried pin (molten and blackened) on it when I dismantled the PC.
I got a new power supply and located a MB taken from a GX820 and attempted to utilize it as a replacement.
The new MB, Ser# CN-0H7276-13740-56F-01XG powers up and reports that the CPU is not supported.
Is there any way to determine which CPU's can be supported or would resetting the BIOS allow the CPU to work?
The physical configuration (3 PCI slots, 1 PCI-e, 2 SATA etc), the sockets (LGA775) are all the same as well as the intel chip (FW82801FB)

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  • travlin_man6 Jan 25, 2009

    Sorry, the new MB was taken from another Optiplex GX280 (unknown configuration).

  • travlin_man6 Jan 25, 2009

    This is a FOXCONN MoBo (LS-36 per the sticker on the board) and does come up on a search at the FoxConn website.

    Typically there is a range of processors that will function on a motheboard but may require a change in setting (voltage jumper, clock speed, etc) in order to function. I am looking for any information on this board from Dell that would help me determine what CPU;s will work and any specifications available.

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  • Master
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The CPU must match the motherboard. You can go to the MOBO manufacturers website and find out exactly which CPU fits on that model. Without that information from the manufacturer you may fry something on the board.
Don't forget to rate this solution before logging out.

Posted on Jan 25, 2009

  • Randall  Trahan
    Randall Trahan Jan 25, 2009

    Go to www.hardwaresecrets.com

    They have good information on tricks to find motherboard types and many other things that may help you.


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We have around 30 units of DELL Optiplex GX280 having mother board failure. It was more then 3 years old already. Once the turbo fan become noisy then it will gone dead.


May be serious. See if the power light goes amber after power up. I had (have - still siting in my basement) one that did same. Power up, fans sound like 747 taking off. Power light goes and stays amber. This is USUALLY caused by bad capacitors on the mother board. Known GX280 problem going back. If you look on the motherboard, the capacitors should have flat tops and not leaking. If the are rounded or leaking, the MB has probably gone bad.

I obviously can not be 100% sure about this as the unit is not here.

You can google "gx280 solid amber light loud fan" and see the issues. Here is one such link.

http://en.community.dell.com/support-forums/desktop/f/3514/p/19253544/19414291.aspx

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I obviously can not be 100% sure about this as the unit is not here.

You can google this and see the issues. Here is one such link.

http://en.community.dell.com/support-forums/desktop/f/3514/p/19253544/19414291.aspx

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