You can get a PCI diagnostic card which may tell you more https://www.amazon.co.uk/Motherboard-Diagnostic-Card-4-Digit-Analyzer-x/dp/B00H51J166 (I've never used this one, just the first that came up on Amazon).
Nice one, there is one known error that's caused a crash before, but I've never gotten around to fixing it. This time round was something different, pretty sure it was the RAM dying.
@aggi started
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You can get a PCI diagnostic card which may tell you more https://www.amazon.co.uk/Motherboard-Diagnostic-Card-4-Digit-Analyzer-x/dp/B00H51J166 (I've never used this one, just the first that came up on Amazon).