It definately depends on price. AM3 Motherboards are much cheaper than LGA 1156. you can get a Phenom II x3 720 and Mobo for under $200. an i5 and Mobo is a $300 deal. The i5 is better, but it's also 50% more expensive, and to be honest most games only use 2 cores right now, some use 3, but not many. The big advantage of a 3 core processor is that it lets you unload all the additional background windows crap onto the third core. Given my expenses I'd definately go for the x3 720. The x2 550 is also a nice chip, and it may clock slightly higher than the 720, but it's only $20 cheaper, and from most of the benchmarks that I've seen, it looks like the third core is much more beneficial than an extra 100-200mhz of clock speed, and it'll probably become an even bigger advantage as games get more threaded.
It definately depends on price. AM3 Motherboards are much cheaper than LGA 1156. you can get a Phenom II x3 720 and Mobo for under $200. an i5 and Mobo is a $300 deal. The i5 is better, but it's also 50% more expensive, and to be honest most games only use 2 cores right now, some use 3, but not many. The big advantage of a 3 core processor is that it lets you unload all the additional background windows crap onto the third core. Given my expenses I'd definately go for the x3 720. The x2 550 is also a nice chip, and it may clock slightly higher than the 720, but it's only $20 cheaper, and from most of the benchmarks that I've seen, it looks like the third core is much more beneficial than an extra 100-200mhz of clock speed, and it'll probably become an even bigger advantage as games get more threaded.
I think that you might want to look at Tom's Hardware's current Sept 2009 budget build.
It's pretty potent and hard to beat for the price.Also the Phenom II X2 550 BE used in the build can possibly have it's extra 2 cores unlocked with that motherboard nearly giving you a Phenom II X4 955 BE if successful.With the extra cores unlocked the benchmarks would be even better.
http://www.tomshardware.com/review [...] ,2424.html
My vote is for the i5, myself debating a i5 or I7 860 - leaning more toward the i5 (cost vs performance) The AMD route is cheaper and that means a better GPU for better performance in games. But overall performance, the i5 is WAY better. Also 4 cores vs 3 cores (Low end amd CPU, granted you MAY be able to get 4th core working - BUt not always)
I tend to look a few years down stream, and if you can afford the i5 route - Go for it!!!
Some performance charts comparing I5/i7/AMD CPUs, You decide