Summary: I had a Optiplex 330 tower which blew out the power supply. This was a quicker and easier choice for the short term as I just swapped my old hard drive into this new system. I'll probably replace the P/S in the other system if I get the time and inclination.
Summary: I thought I should start off by saying that the computer I purchased did not come with a 2.4 GHz Intel Core 2 Duo as advertised but instead was equipped with a 2.4 GHz Intel Pentium Dual Core processor (not to be confused with a 2.4 GHz Intel Pentium D). According to sites such as cpubenchmark.net, both processors that I mentioned previously perform similarly according to their benchmark testing--considering that both processors are very similar in structural design.
Summary: This system provides all my computing needs at an excellent price. Everything was in order when the system arrived promptly from the seller. I'm also extremely happy with the software that was available on the system; i.e. Win 7 Pro and MS office. The larger hard disk (250GB) is much larger than those available on similar systems at this price. The computer is one of the best recent purchases that I have made. Hats off to the seller.
Summary: Optiplex 330 ordered, Dell OptiPlex 760 received, a later model that can be upgraded to 8Gb from 4Gb. Works OK and has fast boot up time of 35seconds. On the downside the cooling vent fan was very noisy for home use creating noise and vibration. Being an Engineer I have replaced it with a Maplins Akasa 12cm Ultra Quiet PC case fan for only £11-99 This purchase gives a good alternative to purchasing a new Tower for approx £400 unless you are into gaming.