I asked about orientation of the CPU fan as some can be reversed and if that what so in tthis case, wanted to check. As observed, fan is OK as is designed that way.
It appears that the sensors on the AMD A series are "rat ****", HWMonitor only supports up to the FX series, SppedFan tends to read the core as Temp3 and not very good.What appears to be the most accurate is AIDA64 Extreme Edition. You could try the Trial version, > http://www.aida64.com/downloads to stress the system to see how stable it is.
You do have Gigabyte EasyTune6 software installed, you could investigate it to see what temps/volts/fans it shows. Not used it so don't know anything about it's over-clocking features.
See what sort of results you get before buying a different cooler.
i will be ordering some DDR3 1866 soon but whats best to do with the other, can i use it as well in slots 3 and 4 or does it all have to be the same speed?
RAM must be of the same speed, when mixed, all will run at the lowest RAM speed. Use this tool to find the correct RAM for your build. NB. You do not have to buy from Crucial, other brands are OK so long as they have the same specs. I always use low profile sticks helping to prevent issues when installing after market cooler.
The following gives a convincing reason for a fans to blow down, when top mounted.