Q: Intel Dual core 1.86Ghz T2390 or Intel Centrino Core 2 duo 1.83Ghz T5550
A: Comparing specs: http://processorfinder.intel.com/details.aspx?sSpec=SLA4H vs http://processorfinder.intel.com/Details.aspx?sSpec=SLA4E the T5550 is a more superior product since you have a faster FSB and the level 2 cache has 1MB more than the T2390. For those of you basing superiority off raw clock speeds, consider the old Prescott P4's that ran at a native 3GHz back a few years ago. Any native 2.4GHz Core 2 duo's now can run circles around the P4's because of better chip design and efficiency.