over threading and over clocking??

Hello, let me move this to the GPU area.

I am not familiar with over threading.

Over clocking is running something at a speed higher than its specification. When possible, it means you are running the core outside of its specification and might run into problems like hanging, heating... Because this make the device run out of specification, you then have no guarantee it will work properly. It may also affect the life length of the product: it could fail much quicker than anticipated.

For example, you have a core specified to run at 1 GHz maximum, but you run it at 1.2 GHz.

I'm pretty sure "over threading" is not really widely used.  I doubt there's any generally understood meaning.

Certainly "overclocking" is a very commonly used term.  Generally overclocking is usually done by consumers, almost exclusively for the application of PC gaming.

PC game players face a unique set of circumstances that make overclocking attractive.  Because there's usually no business or productivity justification for spending money on computers for playing games, often gamers face a tight budget.  Many modern games require massive computational power.  Especially competitive on-line games provide a huge incentive for gamers to obtain more powerful hardware, because faster performance can translate to a competitive advantage (often a matter of virtual life & death - who will manage to shoot the other first).  The combination of limited budget and desire for top performance drive gamers to operate their equipment far beyond its rated specs.

Overclocking is often done in combination with extra cooling hardware.  Sometimes operating voltages are increased slightly.  Running faster and at higher voltage dramatically increases the heat produced.  Often large heatsinks or water cooling systems are used, to maximize the increase in clock frequency beyond the rated specification.

Overclocking risks erratic behavior or even premature failure.  For gamers, there are not large concerns.  If their computer occasionally crashes, freezes or reboots, it may be inconvenient, but the cost is merely losing one round of a game.  The consequences are not severe, like a business losing valuable data or reduced worker productivity.  Shortened equipment lifespan is also not a large concern for gamers, since they regularly upgrade to faster hardware.

In theory, overclocking could be done for all sorts of computing applications, but generally it's only attractive for playing PC video games.

Perhaps you saw the term "hyper threading", but wrote "over threading" in this question?

Hyper threading is a technique that emulates 2 microprocessor cores, using 1 actual computational core.

http://en.wikipedia.org/wiki/Hyper-threading