Laptop confusion

To make a long story short, the T6600 will outperform the t4300, even though the t4300 may have a high clock speed, as it has more cache, etc... I'd stick with the Intel mobile chips over the AMD's, as they tend to run cooler and last longer in my experience. Other may disagree though.

T6600: (2M Cache, 2.20 GHz, 800 MHz FSB)
http://ark.intel.com/Product.aspx?id=37255
T4300: (1M Cache, 2.10 GHz, 800 MHz FSB)
http://ark.intel.com/Product.aspx?id=37253

So T6600 has a higher clock speed and more cache,and i vote for it as well,its the best CPU between those options,however don't consider playing games on good settings with either of this notebooks

I think the L505D is a pretty good choice out of the 3. Unless your son is just going to leave the laptop on his desk, the 17" laptops are a bit hefty to carry around... say to the library or to a study group. The newer AMD cpu should be similar to the Intel offerings and faster than the older generation QL series in the other laptop you posted. Although still not that powerful, the AMD integrated graphics is superior to the Intel.

-mcg

Thanks guys. Ya I thought the same about the 17" . OK T6600 or higher and a 15". And no gaming on this PC its just for school.

Thanks again