So after I installed the 7800 GTX I did a clean Vista install and got 2375 . I flashed the card 450/1250, installed ntune and rivatuner, tried some other drivers and got up to 3300. Drivers came from xtreme g mobileforce and laptopvideotogo.
Then I did a clean install of XP and tried the 8x.xx dell drivers from l2v.
Highest I got was 3730 with 84.21. Drivers tried were between 83.40 and 84.30.
Right now I am trying to get around 4k.
Any driver-advice (xp) is...