You will have to hunt for a PSU with a single +12V rail for his system. PSU's with dual +12V rails are not recommended for his older system due to the fact that no KT266A motherboard has a 4-pin +12V P4 connector, which increases the risk for cross-loading issues and that system can use only one of the two +12V rails of a dual-rail PSU, making for potential PSU failure.
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