I looked at these mobos Specification webpages and I could the supported watts. Here I've listed them all:
ASRock 990FX Extreme3 ATX AM3+/AM3 Motherboard
ASRock 990FX Extreme4 ATX AM3+ Motherboard
ASRock 990FX Extreme6 ATX AM3+ Motherboard
ASRock 990FX Extreme9 ATX AM3+ Motherboard
ASRock 990FX Killer ATX AM3+ Motherboard
ASRock Fatal1ty 990FX Professional ATX AM3+ Motherboard
ASRock 990FX Extreme3 ATX AM3+/AM3 Motherboard
ASRock 990FX Extreme4 ATX AM3+ Motherboard
ASRock 990FX Extreme6 ATX AM3+ Motherboard
ASRock 990FX Extreme9 ATX AM3+ Motherboard
ASRock 990FX Killer ATX AM3+ Motherboard
ASRock Fatal1ty 990FX Professional ATX AM3+ Motherboard