Hello,
Congrats on building your first PC, I hope it kicks some ass for whatever you are using it for! Now for the overclocking, you've come to the right place! I have a similar build but with a AMD x6 1045t and a Gigabyte motherboard. It's not exactly the same as the FX but they are VERY similar, feel free to check out this tutorial on my website on how I overclocked mine:
http://eddieboot.com/amd-1045t-overclock-guide/
I tell what I set the voltage, RAM to, and etc. It's on the AMD FX but they are very similar CPUs. As far as your RAM speed problem goes, where did you see the 1333Mhz at, is it on your motherboard? I found the manual for your motherboard online and it supports some of the highest speed RAM you can buy. But there is something interesting stated on Asus's website for the RAM:
Quote:
Due to CPU spec., AMD 100 series CPUs support up to DDR3 1066MHz. With ASUS design, this motherboard can support up to DDR3 1333MHz.
I'm now 100% on this but it could be a CPU specification based off what their website says. Has the RAM speed always been on that setting though or did it change after you did the automatic overclocking? You see, your RAM can be overclocked and underclocked as well besides the CPU. Depending on how that asus tool overclocked your PC, if it increased your FSB your RAM speed could have been bumped down which is normal. In your BIOS, you can try to play with your RAM settings to get back to the stock 1600Mhz speed. But if it dropped in conjunction with your RAM, what is more important than the RAM is having the CPU overclocked. CPU speed should ALWAYS rule over worrying about your RAM speed. CPU makes everything faster and is what is mostly responsible for creating bottlenecks in your system, not necessarily RAM.
But still, most people after overclocking try to get their RAM at the stock speed again. Now, for your other questions, did the Asus tool do a good job? It's hard to say. Number one, automatic overclocking tools are NEVER as precise as what a human can be. See, you can manually set everything to the absolute best configuration yourself, where that tool really is only pushing things based upon it's own decisions. It doesn't know how well your case is ventilated, what kind of cooler you have, and what the true limits of your PC are. Manual overclocking is ALWAYS better than using a tool like that. IF you haven't done things manual again check out my tutorial above, things may be slightly different though, and if you have an unllocked multiplier on your CPU it is better to use that than the FSB.
That software overclocked your CPU to 3.9Ghz. If i'm correct, the CPU comes stock at 3.6, so what your overclock tool set it to sounds about right. My only concern with your build is your heat solution. Are you using a stock cooler that came with the CPU? I highly suggest you upgrade the cooler for doing any overclocking if you haven't! Other than that, yea overclocking is fairly safe. If something gets too hot or under or over volts usually your system will just kick off or blue screen these days. But still, don't destory your equipment. Do some reading and research more if you want to manually overclock your CPU, which is the best.
If you're happy with the 3.9Ghz, make sure it's table. Download these two programs from the web:
Prime95 - This program is a torture test for your CPU, if you can run it for 6-8 hours without your PC crashing your should have a stable overclock (although they recommend running it 24 hours for best results)
HWMonitor - This program will tell what your temperatures are, if you are going 70c and over on the CPU your overclock is making your system too hot
CPU-Z - if you didn't already know about it, the best tool for telling what your CPU is overclocked too as well as your other hardware
Your CPU is loosely based of the higher end Bulldozer that broke the world record running at over 8Ghz with a liquid nitrogen cooler! If you upgrade your cooler you can probably push that chip you have to 4.5Ghz. Good luck!