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Вообще-то верхние clamping диоды используются для формирования правильной формы сигналов на шине. Если в 5В PCI их можно не ипользовать:
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The upper clamp is optional, but if used, it must be connected to the 5V supply or the
VI/O plane of the add-in card but never30 the 3.3V supply.
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То в 3.3В PCI они ОБЯЗАТЕЛЬНЫ:
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Inputs are required to be clamped to both ground and Vcc (3.3V) rails.
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Читайте внимательно стандарты.
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