well personally i would like to kick the guy in butt who has opty and is putting it in the ECS or A8N-E
well lack of CPU multiplier is critical many times. The motherboard maybe good overclocker. But you need to remember that many times the overclocking experience of the review sites depends largely on the components you use.
Sure with good RAM it will do good. But will it overclock well with our standard transcend RAM or Twinmos or Hynix?
I have a doubt there. None of these boards have extensive memory options, so you are limited by memory. Say you use the dividers. The problem is even with DDR333 divider and limited memory option your CPU overclock becomes restricted to say 280-290HTT. Not all ram wotk with DDR266/200 dividers on all boards.
When you buy opteron and plan to oc it you need good quality board with it.
Out of these two i will still give ECS 1 point above the A8N-E simply bcoz of the larger vcore.
I still think none of the two boards are ideal for Opty. I have stong doubts if it will let you oc Opty to its limits or even close. A8N-E has better bios options of the two, ECS has better vcore if needed. Its kinda mixed bag. None of the two boards are ideal. If your CPU is good A8N-E will give better results. If your CPU needs more vcore then ECS will do better. Its a coin toss unless you have ways to test your Opty first and its ability to overclock. If you know someone in Delhi or noida with DFI who will allow you to test that CPU on the DFI then do that first, see how your opty reacts to vcore and then decide the board.