Just to let and D630 owners know. If you update the bios to A19 you can install 8Gb of ram 2 X 4Gb available for around £64 and upgrade the processor to 2.6Ghz T9500 available for around £26
Some members might recall I also fitted an SSD drive a while back
It makes a substantial difference to the base spec and I'm finding it handles my set up much better.