When AMD cuts there prices i plan on buying a new processor to replace my athlon XP proccessor. My first question is will i notice much of a differnce betwen say a 3800+, 4200+ and a 4600+. Im very aware conroes are better and cheaper but there is no board that will do what i want from them.
My experience with overclocking is that you need at least a 15% increase in speed to be noticeable in anything but benchmarks or other timed operations such as "time make" code compile or a long video render that can take hours. So you should see a difference between the 3800+ and 4600+, but you'd probably not know it if somebody switched a 4200+ for your 4600+ or 3800+.
Im also looking to buy a Asrock 939dualsata2 board, does anyone have any experience with it, I know its sort of a cheap board compared to asus or some of the other better brands but its the only one i see out there with AGP + Pci. I really would prefer to wait for dx10 cards to come out before buying a pci card. Also im sort of a beginner at OCing, will this board let me OC like 100-200 mhz?
I have not used an Asrock board nor known anybody who has. I run an Abit and my friends use ASUS, Gigabyte, Aopen, and one likes PC Chips mobos. Also, get an AM2-socket board unless you have a large investment in DDR 400 RAM as AM2 boards' chipsets are better and they have a better upgrade capability and more memory bandwidth than 939 systems do. Why do you need both PCIe and AGP ports? Do you have an AGP card you're trying to save? GPUs have a shelf life similar to that of milk- they start to stink after a little while. So if your AGP card isn't dead, then either put off the upgrade until it is and get a new PCIe board and GPU or eBay the AGP card and buy a PCIe system and GPU. AGP boards' chipsets are two generations old and I would not consider them for anything but a cheap office-app/internet rig.
As far as overclocking, it is overrated in my opinion unless your chip OCs very, very well and you push it hard. My X2 4200+ can get up to 2500 MHz on 1.4 V, which is a pretty safe voltage as the chip is rated for 1.35 V. 2.5 GHz is about the lowest clock speed that I can tell any real difference over the stock 2.2 GHz. It also runs several degrees hotter under full load and Cool and Quiet is disabled. So I leave it at stock and enjoy the cooler, quieter computer even though it is a tad slower than overclocked. You will not see any real improvement in going over by 100 or 200 MHz- you need to look at 300-500 MHz before it becomes a real improvement. That requires a better cooling solution and better RAM, and since you want to keep an old AGP card, I am guessing that you'd be better off buying the value RAM and using the stock heatsink and keeping the CPU speed at stock.
and lastly sort of a dumb question, most of the boards have a DDR standard of pc3200, does that mean they only take pc3200 or can that take any type of DDR as long as it has the right number of pins?
You can insert any speed of 184-pin DDR SDRAM, from DDR 266 (PC 2100) on up to DDR 600 (PC 4800) and it will function. However, unless your X2 is a revision E socket 939 version, you can only utilize DDR RAM at up to 400 MHz. Anything less than 400 is a performance hit, anything more than 400 is wasted. Rev. E X2s can utilize DDR 433, 466, and 500 RAM without overclocking the CPU and disabling Cool 'n Quiet. But DDR > 400 costs a bit more than DDR 400 and the X2 doesn't really do that much better on DDR 500 than on 400, so get the less expensive RAM. Well, get the value series RAM from a good vendor like Corsair, OCZ, Patriot, Kingston, Mushkin, or Crucial. And also test it with the Memtest86+ utility from a boot floppy or CD for errors to make sure that your sticks are good.