Man of Honour
Or you shouldn't have responded.
How hot does 4 of those become in a tower?...
With the fans turned up you can keep then at around 80c for heavy gaming. The primary tends to get the hottest but strangely cards 2 and 3 in the middle actually run cooler.
Now it no longer matters as they are all under water and the hottest any of them has ever got is 41c.