You have to increase the CPU Voltage to get it to clock higher apparently.
The problem with this is the increased Voltage can mean increased Watts, it all depends on how well the CPU handles it.
The clock pulse is supposed to be square wave as in 0 to V+ in 0 time but clock pulses vary from machine to machine, with either fast rise times and then overshoot or a slower rise time. The first can be better as the decay time of the bounce may be fast, so less current is drawn, it all depends on how good the CPU and the motherboard is.
My CPU fan broke down, or rather fell to bits in May, however having invested in a decent CPU cooler originally the machine still works OK without the fan. I am not over clocking for obvious reasons and tbh I would not bother doing so.
I always start from the premise of outside in, apart from the mother board being the basis of a good system. Peripheral devices need to be a decent spec, be that a mouse, modem/routers, HDD be that SSD or SSHDD. Then gfx card, memory and bus speed, the CPU last of all.
If you get all the peripherals working at optimum speed first, you will get a big improvement in game play. It does not matter how fast you clock a CPU over stock, if you cannot get good communication, between the external components.
Data throughput is the key to a faster machine, and a fast clocking CPU is not worth a penny if data cannot be stored and retrieved at a fast rate. People tend to think that higher CPU clock speeds will give a big improvement, but the biggest improvements come from these peripherals being optimised.
If you are getting 3.8 GHz stable CPU, you should be looking at the peripherals, such as RAM speed and Voltages, bus speed and Gfx card tweaking, and not bother trying to push the CPU any further. Trying to up the Voltage and increasing the clock speed will work apparently, but you are talking about having to get rid of extra heat, which may cost you in cooling parts.
I just bought a cooler for my gfx card, as the fan is making an awful noise now, together with a CPU fan £50 just to keep things cool.
This is the newer version of my CPU cooler. mine had a single fan http://www.quietpc.com/cnps9900-df
and this is the Gfx card cooler http://www.quietpc.com/gel-icy-vision-amd