most probably not close but should give you an idea...
I have a firstname.lastname@example.orgGhz and a 4870 512MB... I play at 1680x1050 with all settings max except for shadows which I limit to medium... depending on the situation I can hit over 100 fps (25 man raids under no stress)... the most demanding boss battles set me down to around 30 fps and I feel it's no real problem for it, still looks smooth as silk
Dalaran is another beast... I've been down to 20s there but rarely do I drop below 40
still... remember that wow benefits more from high cpu clocks over graphics muscle