Cardiff Blues moved back above Bath at the top of Pool 4 in the Challenge Cup after they saw off Pau 27-12 at Cardiff Arms Park on Friday.
The Welsh region led 13-5 at half-time thanks to a try from USA international wing Blaine Scully and the boot of fly-half Steven Shingler.
In reply lock Daniel Ramsay crossed for the French side, who lost to Bath last week, as they went into the break very much in the game.
The Blues crucially got the first score though in the second-half when centre Cory Allen crossed on 50 minutes to push his men 20-5 up.
Allen claimed his brace 11 minutes later but the Blues could not add the elusive bonus-point try as Cardiff take four points from the game.
For Cardiff Blues:
Tries: Scully, Allen 2
Cons: Shingler 3
Pens: Shingler 2
Cardiff Blues: 15 Dan Fish, 14 Alex Cuthbert, 13 Cory Allen, 12 Garyn Smith, 11 Blaine Scully, 10 Steven Shingler, 9 Lloyd Williams, 8 Josh Turnbull, 7 Ellis Jenkins, 6 Macauley Cook, 5 James Down, 4 Jarrad Hoeata, 3 Taufa'ao Filise, 2 Kirby Myhill, 1 Gethin Jenkins
Replacements: 16 Matthew Rees, 17 Rhys Gill, 18 Scott Andrews, 19 Seb Davies, 20 Kristian Dacey, 21 Tomos Williams, 22 Jarrod Evans, 23 Matthew Morgan
Pau: 15 Charly Malie, 14 Louis Dupichot, 13 Santiago Fernandez, 12 Pierre Dupouy, 11 Bastien Pourailly, 10 Brandon Fajardo, 9 Thibault Daubagna, 8 Ben Mowen, 7 Sean Dougall, 6 Pierrick Gunther, 5 Daniel Ramsay, 4 Masalosalo Tutaia, 3 Sylvain Charlet, 2 Quentin Lespiaucq Brettes, 1 Jérémy Hurou
Replacements: 16 Lucas Rey, 17 Geoffrey Moise, 18 Joel Sclavi, 19 Fabrice Metz, 20 Giovanni Habel Kuffner, 21 Thierry Lacrampe, 22 Romain Buros, 23 Marvin Lestremeau
Referee: JP Doyle (England)
Assistant referees: Wayne Barnes (England), Gareth Copsey (England)