should be fine, depending on your budget though go for an Intel chip. You can find an i3 for the same price. look at "http://www.cpubenchmark.net/highendcpus.html" to compare. My advise would be to invest in something like the i5 2500k which will last you 5 years +. Can get a complete set up for around 500 pounds. If you dont game consider the AMD FX-8150 Eight-Core.
If your looking for the cheapest possible check ebay or similar and look for a dual core for less than 100 pounds. Something like a xeon 3.0 ghz (some of these are advertised as quad cores when they're not)
Contact the sellers to see what fans they've put into these computers with small enough fans your computer can literally be silent and its worth paying a little extra for.
all the best