Someone else said their 4300 @ 3.2 does it in 20 seconds. So, on par with older C2Ds then? And an ES to boot
An E6300 @ 2.8Ghz does 20 seconds.
But Super Pi is grossly biased towards Core 2s, so it might be better to compare with AMD.
For instance, X2 6000+ running at 3.3Ghz gets about 25 seconds.