Are you sure about that ?
Not positive, and it's really difficult to confirm the answer for you
because of the sluggishness of the Asus Web site. However, if you can
go here:
http://support.asus.com/default.aspx?SLanguage=en-us , and
note that under the "Support" menu, the first choice is "CPU," that
takes you to this page
http://support.asus.com/cpusupport/cpusupport.aspx?SLanguage=en-us,
but sometimes you can't get anywhere just entering the last URL, at
least from my location. If you get that far, you can select the CPU
from a dropdown list and then see all the Asus motherboards that are
compatible with it as well as the BIOS version for each which added
the X2 compatibility. If you have trouble with this, maybe you can
get the info you need at a time of day when the server's not being
slammed.
Here's what I copied just now, however:
For Athlon 64 X2 Dual-Core 4200+ (Socket939), the following
motherboards are compatible
A8N-E: ALL board revisions and all BIOS versions since 1004
A8N-SLI: ALL . . . BIOS 1008 and after
A8N-SLI Deluxe: ALL . . . BIOS 1010 and after
A8N-SLI Premium: ALL . . . BIOS 1005 and after
A8V: ALL . . . BIOS 0205 and after
A8V Deluxe: ALL . . . BIOS 1013 and after
I think that's all of them, isn't it?
Ron