based on this image:
XFX nForce 680i SLI | bit-tech.net
XFX like typically cutting corners and using cheaper caps instead of solid caps - I seen too many 5 year mobos with blown caps - unless the pc was kept in server room 60f temp - some of them guaranteed to die in 5 years ballpark
Nvidia for intel chipsets there never big hit, I'd skip it...
Just save enough money and get i3 like, i3 with overclock will blow away your q9400 out of the water (atleast in most games)
On other hand XFX 680i SLI retail was $200 and if you could get it cheap enough like $30-40 maybe it's worth it - don't expect speed large boost just from changing the mobo thou