Note that the HD 2600 XT was benchmarked against the 8600M GS. The 8600M GT is the faster of the two 8600M cards, with an enhanced texture fill rate. As quoted from NotebookReview.com:
http://www.notebookreview.com/default.asp?newsID=3699
Further, the review that Mr._Kubelwagen quoted from says nothing about the 8600M GS' 3DMark scores. Read the review for yourself here:
http://laptopmag.com/Review/HP-Pavilion-HDX-Entertainment-Notebook-PC.htm
Once again, this is on a canned benchmark. I made a point of linking to the HardOCP article earlier. The 8800GTX and the HD 2900 XT earn very similar 3DMark06 scores, but the 8800GTX has no problem ousting the HD 2900 XT on gaming tests. Power consumption on the HD 2900 XT is also greater, leading me to believe that power management on the HD 2600 XT can't be very solid either. Certainly this is an assumption on my part.