|I don't know why the CPUs between the 5200+ & 6000+ aren't listed but I can only assume there's a reason. The 6000+ is gonna be a little hard to find & if you resort to eBay, there's always a risk involved. Your AM2 system is "old" by computer standards....AMD has already gone thru the AM2+ series & is currently on AM3. For approximately the same price as a new 6000+ CPU, you could buy an AM3 board & CPU that will spank the sh!t out of your AM2 setup.|
As for your opinion about overclocking, you obviously know little about CPUs. For instance, all AMD CPUs based on the Brisbane core are essentially the same CPU. AMD brands them as 5000+, 5200+, 5600+, etc & varies their clock settings to offer CPUs in different price ranges, but that doesn't change the fact that they're all basically the same. For instance, the 5200+ is clocked at 13.5 x 200MHz (2.7GHz) & the 6000+ is clocked at 15.5 x 200 (3.1GHz)...the only difference is the multiplier. AMD locks the multiplier from being raised (unless you have a "black edition" CPU) but they do NOT lock the reference clock from being raised (the reference clock for ALL AMD CPUs is 200MHz).
Your 4200+ runs at 11 x 200MHz (2.2GHz). You can't go higher than 11x with the multiplier but you can change the reference clock from 200MHz to say, 250MHz. That will change the CPU speed to 2.75GHz (11 x 250MHz). Raising the reference clock has a domino effect on the other clocks (RAM, HT, PCIe, PCI, etc) so those settings have to be adjusted to compensate, but myself or someone else can layout all the recommeded BIOS settings. And understand that I am NOT recommending that you overclock to the extreme....I'm not suggesting settings that would push the CPU to it's limits or require an advanced cooling setup. I'm just suggesting a reasonably mild 20-25% overclock that almost ALL CPUs are capable of these days, usually without any voltage increases.
But hey, if you'd rather spend your money, go right ahead. Remember when you go shopping that the X2 6000+ MUST be the 89W Brisbane version at 3.1GHz...do NOT get the 125W Windsor at 3.0GHz.