WEI is really relative, for the same 630 it can range from 5-7 on different systems, so it shouldn't be taken seriously.
Are you afraid if your CPU is under-performing? If so, go get a benchmark like 3DMark to see if it really is.
Thank you "Timop" for your quick reply. In fact I saw many benchmarks for that CPU, but I don't have a sense of what they mean exactly, while I deal mainly with Windows 7 Experiment score, so I can sense it very easily.