Cores That Don’t Count

cmartinez

Joined Jan 17, 2007
7,394

https://www.theregister.com/2021/06/04/google_chip_flaws/

Today's computer chips are so advanced, they are more 'mercurial' than precise – and here's the proof
Rarely seen miscalculations now crop up frequently at cloud hyperscale
Loved the last paragraph of the article:

"In our recent experience, roughly half of these human identified suspects are actually proven, on deeper investigation, to be mercurial cores – we must extract 'confessions' via further testing (often after first developing a new automatable test)," Google's researchers explain. "The other half is a mix of false accusations and limited reproducibility."
 

Thread Starter

nsaspook

Joined Aug 27, 2009
8,667
While cleaning up some old stuff I found my old 368 (original Compaq Deskpro 386) that didn't count or run 32-bit software.
https://www.pcjs.org/documents/manuals/intel/80386/
http://chipdb.org/cat-16-289.htm

I think the one on the left has the bug.
The 386 on the right has the double sigma mark to it's been tested for 32-bit operation.

There are three distinct species:
- no marks
- "16 bit s/w only"
- double sigma
 
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