There are two Core i5 models. One features 3MB of cache, a 2.4GHz frequency, two cores and four threads plus Turbo Mode, while the other features two cores, four threads, Turbo Mode, 3MB of L2 cache and a 2.53GHz frequency. Fudzilla prices them at $225US and $257, respectively.
Finally, the 2.66GHz Core i7 model features 4MB of cache and Turbo Mode and can run faster. Fudzilla expects them to sell for $332. You'll remember that desktop Macs received Nehalem architecture processors earlier this year, which these Arrandale processors are based on. If built into Apple's MacBook Pros, they'd represent a significant performance boost over the Core 2 Duo processors currently in use.