F15q and F15o are BETA versions.
Meaning in actuality, they use the consumer as a guinea pig, and see what the results are. Then they might 'tweak it', and call it good.
Becomes an Alpha version then.
Work the bugs out that have been found by the consumer]
My bad. Let me use the 'prose' they use,
"What is BETA?
BETA describes a new version that is reliable yet may not include all
the features of the final product. During this phase we are previewing
new features and gathering customer input to insure our product provides
the best experience possible."
Next, the logical thought is; to download the Latest version.
The thinking is that the latest version has all the bugs worked out.
However this may be a fallacy for your particular motherboard.
The latest version may not work.
Makes you feel all warm, and fuzzy inside, huh? (NOT)
The procedure to use when updating BIOS, and using any version; is to make sure you keep a copy of the old one.
When upgrading, you will be asked if you wish to make a copy, of the old BIOS program.
YES, is the answer.
Something happens with the new version, you have the old version to revert back to; and at least be able to use your motherboard.
No BIOS? Might as well use the mobo for a Frisbee.
So,......looking at the different versions that you see, look at each one's date.
F5 is 03/28/2012. March 28, 2012
Indicates Enhanced overclocking capability.
What does F6 do, that came out April 26, 2012?
1) Improved Processor overclocking, using a processor based on the Sandy Bridge Core,http://en.wikipedia.org/wiki/Sandy_Bridge
2) Brings support for using an Intel Xeon processor.
Now look at the next version, F7.
All the improvements you see listed for each version, are culminated in the newest version,
That is, the newest version that has proved to be stable.
Supposedly the 'bugs' are worked out.
The other two versions F15o and F15q, again; are BETA versions.
Should ONLY be used by those who have a lot of experience, and know what to do if it fails.
So this leaves us with F14.
HOWEVER again, make SURE you make a copy of the old BIOS version.
When updating you will be asked.
(ALSO, if your power goes out in the middle of a BIOS update, kiss the motherboard goodbye; unless you made a copy of the existing BIOS version.
This is why I, and others state; that unless there is a definite reason to upgrade the BIOS program on your computer -> DON'T)