AMD was a little too early in May with its monthly Catalyst driver release, with the Catalyst 11.5 WHQL reaching the web as early as 9th May (usually monthly Catalyst updates are released after the 24th). On the same time, AMD also released its first hotfix update for the Catalyst 11.5, the 11.5a Hotfix Update, which packed a number of game-specific performance improvements. Today, AMD released its second update for this month, Catalyst 11.5b Hotfix.