AMD Ryzen 7 1800X (14nm Zen)

[scaryjim]

... a consistent fan policy by adding 20°C to some CPU's and not others ...

"Consistent"'s a tricky word, isn't it ... on it's own its actually meaningless, as you have no idea what that consistency is meant to be measured against.

My suspicion is that they've analysed some 95W rated coolers and found that they're only 95W capable at 100% fan speed, and typical fan profiles either won't hit 100%, or won't hit it at a low enough temperature. So to ensure adequate cooling in those circumstances they have to force the fans to ramp up earlier than usual, which means reporting a higher temperature than usual.

Interestingly AMD's own overdrive tool reports temperatures as margin to tjMax (or at least it does in the version on my laptop!), which is really quite disconcerting - watching a temp gauge rapidly drop towards 0 under load....

[Corky34]

You get the correct ramp up to tjmax. Fan speed should be set as a derivative of %tjmax really, but tends instead to just be set on absolute temperatures.

So you may need to explain that as wouldn't setting a higher tCTL just mean you're in effect lowering tjmax, does that mean Ryzen has problems when operating above 75°C rather than the (afaik) 95°C tjmax AMD claims.

[kalniel]

So you may need to explain that as wouldn't setting a higher tCTL just mean you're in effect lowering tjmax, does that mean Ryzen has problems when operating above 75°C rather than the (afaik) 95°C tjmax AMD claims.

If that's the reason it's being done, yes. I would like to see at what reported temps the chips begin to throttle... If it's not the reason, then I'd expect them to throttle at 115C reported.

[watercooled]

Watercooled, I think this explains your temp thing:
https://community.amd.com/community/...e?sf62107357=1

Yep, that sounds correct! Gigabyte seem to be aware of the issue too and newer/beta BIOSes show the correct temperature. I'm just glad there's no fault with the thermal path itself which was the thing concerning me.