If you are talking about HP Pavilion DV3005 TX, it will be totally blown away by XPS1530.
And first of all, it's not a gaming laptop. It comes with 8400GS, which is for multimedia playback etc and not at all recommended for gaming.
XPs 1530 on the other hand has 8600GT, which is atleast 3 times more powerful than the 8400GS.
moreover, gaming will be pathetic on a 13" display.