MP 1,1-5,1 5,1 Dual Processor spurious Tdiode value

[martinlangley]

Hi all, long standing problem, - seemingly nearing resolution

I have a dual processor tray for my Mac Pro. It works fine as a single processor board, when I add the second processor I
get the following.

The system refuses to start unless I freeze the tray in the freezer for an hour first, then it runs for (say) five minutes
before warming up and crashing as a result.

Most recent investigation has been to use istat to report temperature values for Xeon x 5670 processor pair.

What I get is: processor A, heatsink 18, relative to prochot 75, Tdiode 20, processor B heatsink 20, relative to prochot 75,
Tdiode 128.

There is clearly a spurious Tdiode figure which is crashing the system cos it looks like an overtemp value.

Anybody happen to know where istat gets its temperature values from, and if there's away to correct this, ideally thru software.

Thanks in advance, you guys are the best

Martin

 

[Macschrauber]

Is it a real 5.1 or a 4.1?

Processors upgraded ?

if 4.1 lidless ?

 

[h9826790]

Anybody happen to know where istat gets its temperature values from, and if there's away to correct this, ideally thru software.

From SMC, and no way to correct it.

The first thing to do is to swap CPU A and B, and let's see if the problem switch to CPU A.