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Athlon quad Core CPU's Won't Boot

Last response: in CPUs
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August 17, 2012 8:45:00 AM

Hi, I have upgraded my dual CPU Tyan Motherboard from 2 Athlon Dual Core CPU's to 2 Athlon Quad Core CPU's and I cannot get the Computer to boot! even to the Cmos Screen.
I get no beeps, the CPU Fans speed up, but it just sits there.
THe Quad Core CPU's are 2nd hand but are supposedly tested OK. I have stripped all the PCI Cards out, reset the bios, changed the Ram placement, tried one CPU at a time but all to no avail.
As soon as I put the original CPU's back in, the computer boots and is on it's way.
Does anyone have any idea what may be causing the problem?? All I can think is that I have bought two Dud CPU's

Thanks for any help.
a c 109 à CPUs
August 17, 2012 9:02:55 AM

They might not be supported by the BIOS.

What CPUs are you replacing, what are the new CPUs (model numbers) and what motherboard.
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August 17, 2012 9:23:14 AM

The Motherboard is a Tyan Thunder n3600B S2927

The original CPU's that are in it are AMD Athlon Dual Core 2218's OSA2218GAA6CX

The CPU's that I have unsuccessfully replaced them with are AMD Opteron 8389 Quad-Core 2.9GHz CPU OS8389WHP4DGI

Both are F Socket.

I thought it would be an automatic replacement.

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a b à CPUs
August 17, 2012 11:48:30 AM

Your board doesnt support it totally different family of CPU the series number is a giveaway

Old CPU - 2218 (2xxx series)

New CPU - 8389 (8xxx series)

Your board only supports the 2000 series sorry to be the bearer of bad news but the new ones you bought will never work on that board.
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August 17, 2012 12:24:57 PM

Ooooooooohhhhhhh!!

I figured because it was an F Socket MB it was compatible. You are sure???
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a c 109 à CPUs
August 17, 2012 12:31:05 PM

Same socket doesn't mean it would work, one uses newer stepping, different architecture ,athlons and opterons are different, and it depends if the chipset and BIOS both support the cpu and is at or below the TDP limit.
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August 17, 2012 6:01:47 PM

Thanks fir the help
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!