I’ve been experimenting with the speed of my CPU, wanted to see how slow I could run it but still have enough CPU power to do the every day mundane tasks in Windows. (Not gaming)

Why?
To save power and money, make less heat and at the same time maybe extend the life of my PC.

I successfully got it to run as low as 1.2Ghz @0.85 volts, but at that speed there were signs of a slow down, the worst was in media Center where the PC couldn’t successfully keep the video playback of HD content running smoothly.

I have ended up with a core speed of 1.6Ghz (roughly) and a core voltage of 0.96V, at this speed the PC seems to run almost as quick as default, not really any noticeable slowdown and HD video playback is perfectly smooth.

I have achieved this underclock by setting the multiplier to 6 instead of 8 (the default) and then reducing the FSB until I got to 1.6Ghz.

Then reducing the CPU voltage to a stable place.

Then reducing the RAM voltage to a stable place also.

Good point about the power consumption Snowy, I will post some info about it later.   

Yes I do have to reboot and make changes in the BIOS when I need to clock it up, doesn’t take long with the SSD in there.

The hardest part will be remembering the settings     

It's a case of if it aint broken don't fix it.

But with regard to under clocking, have you found out if it's worth the hassle Data ?

I don't think I can be bottomed to do that every time. 

On my PC I have some controls where you can opt for things like performance or eco saving options.  I never use it, I always keep it on performance.

I'd still like to see the power savings by underclocking the graphics card.
Seeing as this is much easier to do. Not requiring a reboot and all that.

I know, I'm a pain in the 

Snowy, power consumption savings on the graphics card, new thread.

http://www.datahopa.co.uk/forum/pc-hardware/hd4890-underclocking/


Freddy, there are two prices that I pay, depending on the time of day I think,

Standard = 18.76p.

Reduced =  12.07p

My last electricity bill was £62.30 for a quarter, which I believe is way below the average in the UK and I put that down to all the little power savings I’ve made around the house, Hmm that could be another topic. 

That's about $31.90USD per month! My computer alone costs that much to run! Our electricity bill runs about 5 times that much for the entire house!

lmao... Solar panels. In England... 

Now if they had some way of power generation that involves rain and gloom...