New 3.06Ghz iMac : slower than the old model!
I checked some benchmark results of XBench 1.3 on early 2009 3.06Ghz iMac, and discovered that the performance-level is really better than the new 3.06Ghz iMac:
New 3.06Ghz iMac score a deceptive 133 on 21.5inch and a not-so-whopping 171 on 27inch, both with 4GB DDR3 (2×2GB DDR3), 1TB 7200rpm hard-drive and underclocked ATI Radeon 4670 with 256MB video-ram. So it’s between 133 and 171.
Old 3.06Ghz generation scored approximately 201, and overall 1.2X faster than the 27″ new iMac! The old 2.93Ghz iMac is still 1.1X faster than new 3.06Ghz generation. Even a 2.8Ghz DDR2 24″ scores better than the new 27″ 3.06Ghz on XBench!
Worse, it seems the new iMac 21.5inch 3.06Ghz DDR3 Radeon 4670 is slower than 2007 iMac 20″ 2.4Ghz DDR2!
They are totally and deceptively under-performers, and the price tag may reflect the bad technical choices (probably ATI Radeon instead nVidia GeForce!), and an old entry-level iMac 2.66Ghz 24″ GeForce 9400M will outperform the brand-new 27″ Radeon 4670 model 
