Smc failure Mac Pro 3,1

I have got an Mac Pro, model MacPro3,1; 2xQuad-Core Intel Xeon; 2,8 GHz, early 2008.
Boot-ROM-version:    MP31.006C.B05; SMC-version:    1.25f4;   Serialnumber:    CK******XYL
Since a month now the sytem is shutting down unexpectedly, sometimes during boot, sometimes after 10 minutes and it also takes some hours.
The computer is in a warm dry room.
Suspend mode is also a problem. Most of the time in suspend mode, afte a few seconds, it shuts down completely.
When I boot in Target mode it stays on as long as I let it.
I have don't Pram and SMC reset.
The problem resists when running OS10.6 or 10.8.
Is it possible to do a firmware downgrade? And would that work?
Is it possible to do an upgrade only for the SMC chip?
Is the replacement of the logic board the answer?
Where do I buy a logic board?
I can replace it myselfe.
<Edited by Host>

Heat is not the problem. For it also shuts down after a few minutes.
My GPU is a  NVIDIA GeForce 8800 GT 512 MB.
At work I have a simmular Mac Pro, but that's a 2007 model. It has run fine through the years.
The OS has nothing to do with it, I 'm using OS10.6.8 and 10.8.2 (2 different drives).
I beleave 2008 was a BAD APPLE year.
There are to many stories about failing logic boards that year.
Apple never should have changed to Intel.
I've a iMac PPC and it keeps on working, never tired, never a bad mood . . .

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