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The Early 2009 Mac Pro—also known as the Mac Pro 4,1—introduced Intel's Nehalem architecture to Apple's line of professional desktop computers in March 2009. The Mac Pro 5,1 used the same interior design but received further CPU updates in 2010 and 2012.

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Upgrading CPU's Riser board throws red LED after installing X5690

Hi,

I upgraded my Firmware to 5,1 on a 2009 MacPro. The computer boots fine with the dual quad core processors. But when I install the X5690 3.46ghz chips - it throws the red led and doesn't chime post, no video (page 34 of the MacPro early 2009 manual).

I have tried booting with different OS versions, tried a second Riser Board, reset smu. Confirmed boot version B03.

I have put the X5690 in a single core Riser Board and it boots fine.

Could it be the chips don't work as pairs?

Thanks

Update (05/23/2018)

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Wxxx series don't work in pairs - Xxxx yes

does CPU (but put as a SINGLE) works in both sockets? Just want to eliminate faulty CPU

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other problem can be - I gues You put them with..... lids - as 2009 got lidless - put 3 M4 (2.1-2.2mm thickness) washers on each pin - tide screws with usual force.

I hope you did not used usual force to do screws without washers as you crushed socket or...... as I've purchased non working dual cpu tray months ago and it had...... BURNED / melted TOGETHER 2 socket pins - which I saw them ONLY UNDER full zoom photo from my iPhone!!!!!!

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Paul will be eternally grateful.
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