Updating BIOS versions - file size confusion

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http://www.asrock.com/mb/download.asp?Model=AM2NF3-VSTA&o=BIOS

Hello, have the above board in another pc. Looking at the bios updates they are all different sizes, newer updates are smaller in file size than previous sometimes, do the later updates contain all the fixes from previous updates? seems odd if they do because of the file size.

Haven't updated a motherboard bios in a long time, just confused about how to update to get the fix required, from A to B, if I get the newest bios will that contain all previous - even though the file sizes are all over the place!

edit: nm, just going to grab the bios file needed for the specific cpu support. It's just a little confusing as compared to my Asus P5N-D, on the asus it looks like each new bios release contains all previous fixes judging on the rising file size.
 
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