PSU real-world differences between PSU v2.2 and v2.31?

Is there a real-world difference between ATX12V PSU's when they are listed at V2.2 and V2.31? I'm a plebian, pretty confused.

the PSUs I'm looking at, specifically, are:
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  1. Best answer
    As found on Wikipedia:

    ATX12V v2.1
    This is a minor revision from March 2005. The power was slightly increased on all rails. Efficiency requirements changed. Added 6-pin connector for PCI-E graphics cards, that aids the PCI-E slot in the motherboard, delivering 75 watts.

    ATX12V v2.2
    Another minor revision. Added 8-pin connector for PCI-E graphics cards, that delivers another 150 watts.

    ATX12V v2.3
    The most recent revision, effective March 2007. Efficiency recommendations were increased to 80% (with at least 70% efficiency required), and the 12 V load requirement was lowered. Higher efficiency generally results in less power consumption (and less waste heat), and the 80% recommendation brings supplies in line with new Energy Star 4.0 mandates. The reduced load requirement allows compatibility with processors that draw very little power during startup.
  2. Best answer selected by pope7.
  3. Thank you!
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