Intel Core 2 Duo T7800 vs Intel Core 2 Duo T7500 vs Intel Core 2 Duo T7700

Intel Core 2 Duo T7800

The Intel Core 2 Duo T7800 is compareable to the Core 2 Extreme X7800 but featuring a lower TDP and a fixed multiplicator. It is a middle class dual core cpu in 2009 (at the time of announcement it was one of the fastest). Later the Penryn based Core 2 Duo CPUs succeeded the T7800.

Intel Core 2 Duo T7500

The Core 2 Duo T7500 is a middle class dual core CPU for laptops. It is based on the Merom core and features 4MB Level 2 cache.

At the time of announcement, the T7500 was a very fast CPU and had enough performance for games and applications in 2008. In 2009, the Core 2 Duo T7500 performed similar to a middle class Core 2 Duo P7570 or Turion II Ultra M640/M660.

Modern Penryn based Core  2 Duo are a bit faster per MHz (with similar Cache sizes) and are more power efficient.

Intel Core 2 Duo T7700

The Intel Core 2 Duo T7700 was the fastest Merom based Core 2 Duo with 35 Watt TDP (the Core 2 Extreme was faster, but featured a higher TDP). The Penryn based successor (e.g. Core 2 Duo T8300) is a bit faster at the same clock speed.