CPU/Mobo What is the main difference between these mobos?

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At a quick glance, the first 3 boards have a micro-ATX form factor while the last 1 (UD3H) is ATX form factor offering more PCI & PCI Express slots. Not sure if there are any more differences.

"1x eSATA 3Gb/s" port means there is 1 external SATA (SATA II standards) port available at the back panel of the motherboard which can be used to connect external storage devices which have SATA interface. This port is similar to an internal SATA port, however supports hot plug feature and can sustain much more insertions/removals.

Lastly, the revision no. for the motherboards indicate the hardware revision of the PCB. In general, a newer revision of the same model is better compared to the older revision. However, revisions cannot be compared across models.

Hope that answers your doubts.
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The "U D" in the model no. stands for "Ultra Durable", indicating there are higher quality components(capacitors, chokes etc.) used to make the board. The number after UD indicates the how generously these components have been used. UD3 would have more liberal use of said components than say UD2 and so on, however in recent times this classification has been dubious at best...
 
The "U D" in the model no. stands for "Ultra Durable", indicating there are higher quality components(capacitors, chokes etc.) used to make the board. The number after UD indicates the how generously these components have been used. UD3 would have more liberal use of said components than say UD2 and so on, however in recent times this classification has been dubious at best...

Mine is not even a UD mobo, says ultra durable on the box
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Guess it is dubious then.
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