yeah i wanted to buy either AMD Phenom X3 Tri Core 8450 or AMD Athlon X2 6000 .The reason for choosing these two is i am getting both at the same price but i was wondering why AMD Phenom X3 Tri Core 8450 has same price AMD Athlon X2 6000.I have no idea of cpu's so your wise suggestions required
the 6000+ = 2 cores clocked at 3GHz
the 8450 = 3 cores clocked at 2.1GHz
However, even though the total GHz is nearly the same, the 6000+ will give you better performance generally, as most applications (especially games) can't use more than 2 cores. Because of this difference, the 6000+'s extra clocks give it the win.
Unless you're thinking of overclocking (i'm guessing you're not) I'd recommend going with the 6000+
However, if you are thinking about overclocking, it becomes a harder call to make.
in applications that make use of 1 or 2 cores, the Phenom get's ownd by the Athlon as the architecture is similar but the clock speed almost 50% less. In apps that make use of more than 2 cores (video editing etc), the X3 will be a bit faster. You make your choice based on what you need in terms of performance, and apps you'll use.
Hope that helps
The 6000+ will be the better choice if you like games, but the triple core has more potential where multi-tasking is concerned. If you can stretch your budget a little further for a full Quad Core 9550, that would be the best choice.
The 8750 is the best bet for your money right now. They overclock to 2.8 and each core is 10% faster than an Athlon X2. Right now, games mostly support 2 cores (there are exceptions like Supreme Commander and Microsoft Flight Simulator), but an extra core is a bit of future proofing with multi-tasking ability.
That said, I'm not sure if anyone who already has an Athlon X2 should upgrade on a 690 board. When choosing a new build, I'd go with the 8750 over the 6000+; but if you can, wait for Deneb.