weirdness with 5960 CPU upgrade

calmasacow

macrumors member
Original poster
Jun 13, 2012
48
5
Houston, TX
So I got a set of delided 5960 CPUs. I can either CPU to work as long as it is inserted in Socket A. I have tested both in Socket A and either will work as long as it is in Socket A. if I install a second CPU in Socket The system doesn't post. the light comes on but no tone or post. if I boot with only a CPU in socket A I also only see half of the ram banks. I figure that this is prolly normal but wanted to bring it up anyway. Also I know that both CPU sockets are working as I have reinstalled the original CPUs and I'm on the system right now talking to you.

So I know this:

  1. Both 5960 CPUs work "even if only in socket A"
  2. Both sockets work
  3. with 5960 CPUs in both sockets post fails
  4. I can re-install original CPUs and system works fine

Any ideas?
 

calmasacow

macrumors member
Original poster
Jun 13, 2012
48
5
Houston, TX
So I got a set of delided 5960 CPUs. I can either CPU to work as long as it is inserted in Socket A. I have tested both in Socket A and either will work as long as it is in Socket A. if I install a second CPU in Socket The system doesn't post. the light comes on but no tone or post. if I boot with only a CPU in socket A I also only see half of the ram banks. I figure that this is prolly normal but wanted to bring it up anyway. Also I know that both CPU sockets are working as I have reinstalled the original CPUs and I'm on the system right now talking to you.

So I know this:

  1. Both 5960 CPUs work "even if only in socket A"
  2. Both sockets work
  3. with 5960 CPUs in both sockets post fails
  4. I can re-install original CPUs and system works fine

Any ideas?


Uggghhhh so things have gone from bad to worse. I now can get nothing to boot I have tried original CPU and ram and now I just get the red LED next to each CPU socket. and before you say it is the ram I have checked using ram that is working from another MacPro and that does nothing so that isn't it. I have tried everything I can thing of resetting NVRAM PRAM and that kinda stuff and nothing no chime, no boot, Just the white light comes on the front and the red LED next to each CPU socket.

Somehow during this process I know that the clips that hold in the little power connectors for the fans broke. But I have used a set of hemostats and made sure they are getting seated. is it possible I over tightened the heatsinks and ruined the CPU tray?Hopefully someone has some sort of insite that can bring this thing back to life.

right now I'm just feeling completely defeated
 

tpivette89

macrumors 6502
Jan 1, 2018
486
250
Middletown, DE
He said the CPUs are delidded, so I’m gonna assume its a 4,1. And I think the ones he purchased are “X”5690s.

Any more updates on this? Have you tried anything else? Perhaps starting with what you feel is too loose on the heatsink, try and reinstall and power on the system. If that doesnt work, then tightening an 1/8 turn on each bolt in an “X” pattern and try it again. Have you tried cleaning out the RAM slots with compressed air and isopropyl alcohol? Looking for bent pins on the CPU contacts?
 
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