I need help upgrading my cpu, and i do not know exactly what i should upgrade to.?

[JimmyJams]

i need help upgrading my cpu, and i do not know exactly what i should upgrade to. Ive tried searching the web from its system model, to which different processors i can put in and am still stuck. I have an Biostar N61PB-M2S which is the mother board and the processor i have in is a amd phenom 8400 triple core. the memory is 4 gbs and the graphics card is geforce gts 450

 

[Arcanine300]

What is you budget? You are better off getting a new cpu and motherboard.

 

[Karadjgne]

What you have is a really outdated cpu, and motherboard. The AM2 line is pretty much dead. Your board will only support CPUs with a 95w TDP or lower, which means some Athlon ii x4's and Phenom x4's up to a 9550, which was used $110. With the x3 you have now, you ate quite far up the ladder, so an upgrade to an x4 will not see you any significant gains. Sorry, but your best bet would be a new mobo and CPU like these
PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Newegg)
Motherboard: ASRock 970 Extreme3 R2.0 ATX AM3+ Motherboard ($53.00 @ Newegg)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1600 Memory ($68.99 @ Newegg)
Total: $231.98
(Prices include shipping, taxes, and discounts when available.)
(Generated by
2014-05-07 00:32 EDT-0400)[/i

Of course if you have an older 32bit version of Windows, it will only support upto 4Gb of ram, so go with 2x2Gb sticks, slightly cheaper.