Alienware 18 Power supply

I have the new 18 with following specs

4900mq

780m sli

300w power supply

16gb ram (stock)

Problem is when moving from one page to the next, either between internet pages, metro to desktop or vice versa, or different apps or programs there is a significant drop in brightness for a few moments.  The workstation is always plugged in, on U3 cooling pad, and free of any obstruction.  Its less than a month old since I received it but I still checked and no dust problems.  I have verified that all drivers are up to date.  I went to power supply and have all settings set to max performance and brightness all the way up.  I've reinstalled the operating system and still issues persist.  I've also had problems while gamming where the system stutters in game or starts slowing up during the game.  I've monitored the temps while this is going on and its hitting 85-90c and it does not appear the fans are spinning on the CPU side.  The GPU temps are a bit better usually around 75-80c under load but on occasion hitting 85-90c as well.  I'm not sure if the high temps are causing the behavior and this also does not appear to be internet related as its happening when not playing multiplayer games as well as multiplayer games.  Another note is I've been steady hitting about 3-4 BSOD everyday since I've had the machine.  Most are from page fault in non page area, irql_not_less_or_equal as well as others.  I try to check them and resolve the issue on my own but I have not found working resolutions.  I gotta get the BSOD's to stop and the stuttering or lagging in game issues are a big worry.  The upper left corner of the keyboard (CPU) is too hot to touch when gaming.  The decrease in brightness when changing apps or pages is a concern and the decreased performance in offline as well as online gaming is also an issue.  Any suggestions?