Well, that cooler sits about in the middle of the list on Frosty's cooler comparison for AMD heatsinks. That's not the best position really. This quote is straight from Frostytech:
With a 125W heat load applied by the FrostyTech AMD K8 synthetic thermal test platform, the Coolermaster Vortex Plus heatsink yields a rise above ambient temperature of 19.6°C at full fan speed (54.6dBA noise), which is quite good. If the speed of its 92mm fan is decreased to 800RPM, its lowest RPM, the Coolermaster Vortex Plus has a harder time maintaining good thermal results. In this scenario, the Coolermaster Vortex Plus results in a 44.9°C rise over ambient temperature, which is satisfactory at best. Noise output falls to whisper quiet 29.3 dBA.
So, while it's fairly quiet, it doesn't have great performance stats. What was your OC at when you recorded that temp? 3.8? You would definitely be better served with a higher end cooler, but if your case won't fit a tower cooler you might just want to go with an AIO liquid setup. Closed loop all in one coolers are fairly inexpensive these days and do wonders for OC'd chips. If you can fit a tower cooler in there though you might want to consider stepping up to one and with that ASUS board the weight of a tall tower should be no problem.
Using AOD when starting out is not a bad thing, but once you get a feel for where your cpu stalls out using volt/mult settings, and play around with it a bit, you might be able to undervolt it substantially and bring the heat down a few C that way while even possibly gaining a higher clock. Later once you know where you're at with settings you can always drop the AOD and make those changes in BIOS. Or just use it, nothing wrong with it really. Check this article on undervolting and it might give you some insight as to different ways you can set things up.
Just remember, using AOD can be an issue if you get a setting that won't let you boot, whereas with the BIOS you can always just change it up prior to booting. I think if you step on your di#@ with the settings in AOD you should be ok as it will generally either reset after a failed boot or won't even enforce settings unless you are running AOD. Seems there are differing experiences on this.
Here's the link to the undervolting experiment and although it's on an 8 core it should be similar in application to your six core.
http://www.dslreports.com/forum/r28538906-The-FX-8320.my-journey-into-under-volting-an-8-core.
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