Is this PSU reliable? because it is cheap and fits my budget and i was also wondering if it is good enough to power a i5-3570K and a 7950 3GB? If it is not good could you please suggest a good PSU for around 40-50 pounds using amazon.co.uk or scan.co.uk .
Everyone spends a lot of money in their build where it counts and forget one important aspect. The last thing you want to do is cheap out on a power supply. If you're using 450 watts of that 500 watt power supply, you're going to have a lot of heat in your case, and you're going to work that power supply to its almost full potential. You need more headroom so your power supply lasts longer. I suggest you look at one of OCZ's modular power supplies. Since it is modular, you're not using extra cables you don't need, thus using less power.
I actually have a similar Silverstone in a system I built for a nephew. It works great and he beats the stuffing out of it by OCing the CPU and the GPU. He has been using for 2 years with no trouble at all.
I prefer Seasonic and Corsair PSUs, but I would use a Silverstone as well if the deal was right.
Oh never mind, that psu seems to have great reviews and it is fully modular(?) which is great for my case as it is not very good for cable management, i guess i could dish out the extra money for it Thanks for the suggestion is it worth the 57 pounds though?