October 15, 2010 Update -- It's only been 10 days since I wrote this post, and there's already been a considerable change in the availability and prices of these processors. Notably, several AMD processors have been deactivated and the Phenom II X4 955 has dropped in price considerably. I have updated the below chart to reflect the changes. Needless to say, the 955 is now an even better value.

Processor	Speed	Socket	Newegg
AMD Athlon II X4 620	2.6GHz	AM3	$89.00
AMD Athlon II X4 630	2.8GHz	AM3	$95.99
AMD Athlon II X4 635	2.8GHz	AM3	$99.00
AMD Athlon II X4 640	3.0GHz	AM3	$99.99
AMD Phenom II X4 810	2.6GHz	AM3	$115.99
AMD Athlon II X4 645	3.1GHz	AM3	$120.99
AMD Phenom II X4 945	3.0GHz	AM3	$135.99
AMD Phenom II X4 955 Black Edition	3.2GHz	AM3	$139.99
Intel Core 2 Quad Q8300	2.5GHz	LGA 775	$149.99
AMD Phenom II X4 965 Black Edition	3.4GHz	AM3	$159.99
AMD Phenom II X4 970 Black Edition	3.5GHz	AM3	$180.99
Intel Core i5-750	2.66GHz	LGA 1156	$194.99
Intel Core i5-760	2.8GHz	LGA 1156	$208.99
Intel Core i7-860	2.8GHz	LGA 1156	$279.99
Intel Core i7-930	2.8GHz	LGA 1366	$288.99
Intel Core i7-870	2.93GHz	LGA 1156	$289.99
Intel Core i7-950	3.06GHz	LGA 1366	$294.99
Intel Core i7-960	3.2GHz	LGA 1366	$579.99
Intel Core i7-975 Extreme Edition	3.33GHz	LGA 1366	$1,039.99

Notes:
- Energy efficient and server processors not included
- Processors with no competitive advantage not included (some old Core 2 Quads)
- Intel Core 2 Quad processors are to be discontinued this year but are still available

Tags	processor   newegg