Temps now, I no longer have the shot of pre mod temps but I will tell you.. They Sucked.
The reason you need to mod is because the OEM solution is CRAP.
A Cool System is a Happy System
Easy mod allowing for the placement of an intake fan in the front of the HDD bay, if you have 2 HDD. If you only have one there is no need for this mod. Just move the HDD to the top or bottom slot. Pics are old, now I have Raptors.
All I did was drill 2 new holes in the green brackets, the locations to drill are already marked. Keep in mind you will have to remove the HDD bay green shroud for this mod to have any positive effects.
Also with my GEN2 the rear fans were alternated, one was intake and one was exhaust
I removed the shroud and replaced the OEM Nidecs with 2 92mm Antec Blue LED's, oh yeah the front fans are 80mm Antecs. I also cut out all the mesh for more airflow.
With your passive HS you have 2 options, replace it or attach an 80mm fan.
Picture your airflow, cool air in thru the front fans, the HDD fan blowing straight across to the HS and being expelled by the exhaust fans. I went that method for a bit, I then purchased a Zalman 7000 and love it.
To summarize..remove all shrouds, insure both rear fans are exhaust, attach an 80mm fan to the passive HS, install an intake fan in the HDD bay.
The result will be a much much cooler system.
What sux though is Dell removed the sensor chip on all post GEN2 systems
You will only be able to monitor differences in GFX and HDD temperatures.
To stevemc, Our OEM PSU is more than capable of handling any upgrades he were to make. My PSU powers 2 74 gig Raptors, 1 250 gig Caviar, 2 opticals, 4aftermarket fans, Zalman 7000, 7800GS SC CO that is always OC'd, and my 3.2 Nwood oc'd to 3.66 with ZERO issues.