Nvidia 9 series or Intel HD 2000?

I just tested an Nvidia 9300 GS card with a Intel Corei3 HD 2000 graphics system. Here is the windows experience index scores I got :

Nvidia 9300 GS :
Base Score 3.9

- Processor : 7.1
- Memory : 7.5
- Graphics : 3.9
- Gaming Graphics : 5.1
- Hard Disk : 5.9

Intel HD 2000 :
Base Score : 5.2

- Processor : 7.1
- Memory : 5.9
- Graphics : 5.2
- Gaming Graphics : 5.8
- Hard Disk : 5.9

My questions are :

When using Intel HD graphics, it reduces the score of my Ram! How is that possible? It checks the speed of the ram. Not the size (i think). Intel graphics take some of the ram space but how can that effect the speed?

From both of them, what will be the good choice?

I'm pretty sure the Wei takes into account the amount of available ram in addition to the speed which would account for the reduction in the wei.

Also upon checking passmark it would appear that the Intel HD graphics does out perform the 9300 gs although I would need which i3 processor you have to confirm

i3 G3D rating is 200+
9300 GS G3D rating 138.

out of the two I guess you should stick with the integrated graphics since it is better unless you need the extra Ram that is uses