socialfox said:
Actually I did write this from the top of my head. Anyways you could argue stability for motherboards, look at the old Nvidia 680i, it had many bugs in the chipset which gave out many problems. That board had numerous bios updates to fix all those issues, you can say it was an unstable board at release. In addition you are right about the FX thing, I assumed that since it said fx it would support it right away but from looking at the CPU support list there does seem to be a bios but isn't the OP just buying the motherboard now? Wouldn't it come from a new batch that probably does have the FX Bios requirement?
You shouldn't write from the top of your head as people look these threads up read what they say and take it for fact.
As for BIOS being current when bought now, I wouldn't assume that those boards may have been made months and months ago, the BIOS revisions for Vishera are weeks old I wouldn't assume all boards sold having the latest for a couple of months yet (There were still BIOS threads relating to bulldozer appearing here in April).
The FX in 990FX simply denotes the highest "enthusiast" chipset. They have used that since the 790FX chipset. With 9xx chipsets we have
970 - can allow Xfire with 2nd slot at X4
990x - Allows PCIe slots at X8 and X8 for SLi (or a single slot runs at X16)
990FX - Allows up to 4 way SLI at 4 lanes at X8
or 3 lanes at X16, X8 and X8
or 2 lanes at X16 and X16
Any of those could use any of these Southbridges (which can alter the features of the board)
SB710
SB750
SB810
SB850
SB920
SB950
*Edit*
As a practical example the ONLY difference in these boards is the PCIe lanes (and PCB colour on the FX)
http://www.cclonline.com/product/63466/GA-970A-UD3/Moth...
http://www.cclonline.com/product/60859/GA-990XA-UD3/Mot...
http://www.cclonline.com/product/62749/GA-990FXA-UD3/Mo...
They use the same Phases, VRM heatsinks etc literally the only reason to buy 990FX from those 3 is if you plan multi card SLi, 990x if you plan to maybe SLi or Xfire a 2nd and 970 if you don't need SLi. As far as overclocking goes they should all be equal the myth of 970 being a worse board is due to people who buy 970 often buy a cheaper model (say a Gbyte 970-DS3) they then compare it to a better model from the higher chipset (say a 990xa-UD3) it comparing an apple and an orange to make it fair the comparison would need to be both on UD3 boards.