Upgraded CPU, now RAM problems

[adam9c1]

I have a 2010 5,1 4core

Updated CPU to 6core 3.2

Installed this tray into another machine (a 2012) and it only sees two RAM slots.
With memory in 3 banks bank 3 shows a red light, with four banks it does not post at all.

What's going on?
All of the RAM is the same speed.

 

[Synchro3]

Unplug the RAM sticks and plug them again in a different order.

 

[adam9c1]

I did that.
I've reset NVRAM

 

[Synchro3]

Uninstall the CPU and check for bent socket pins on the board.

If there are some bent pins realign them with a needle or similar. I did this once.

 

[adam9c1]

It does boot fine using one or two memory sticks.

 

[h9826790]

You mean the same tray have all 4 DIMM working on one cMP, but only 2 on another one?

 

[flowrider]

When I upgraded my dual CPU cMP 5,1, one of the RAM slots was showing a redlight and the RAM was not recognized. Since I had a dual CPU machine, I swapped CPUs and the problem followed the CPU. I returned and exchanged the offending CPU and all has been fine since. I guess, what I'm saying, it could be CPU related.

 

[adam9c1]

You mean the same tray have all 4 DIMM working on one cMP, but only 2 on another one?

I will bring the tray home tonight and test it in it's original tower.
I have not done that yet.

 

[adam9c1]

Inserted the tray into the original tower and SMC reset.
All ok, then I inserted the other ram one by one and was ok.

Also tried with other ram too.

 

[adam9c1]

So I suppose the 2012 cMP did not like the 2010 tray?

Makes you wonder where people buy trays with upgraded processors (tray swaps).