Well this might work better if your console is constantly freezing. That's the main problem I was having. I only got the Red ring of Death a couple of times.
Ok my 360 decided to start freezing up on me in saints row. I thought eh not much of a problem. Then like what most people said, it finally gave me the Red Ring of Death. Ahhhhhhhhh Nooooooooooo I thought. Then I started reading up and decided to try the thermal upgrade as I was out of warranty so I thought, why not? That worked and lasted for about week then it happened again.
It was this time that I realized that the fans were not spinning up to full speed when the console was playing a game. The fans were spinning the same speed (kinda slow) regardless of playtime and it would freeze. When it was working the fans would speed up and slow down depending whether I was at the dashboard (slow) and playing a game (fast). I thought maybe the thermal sensor is screwed so I decided to do the 12vfan Mod.
While doing this I thought the white cover in between the fans and heatsinks was not really sucking good air from the top of the GPU heatsink. It seems to just suck it in thru the back part of the heatsink. This is when I decided what the hell and try something a little different. I decided to close off the top of the GPU heatsink. Basically I just put a cover on top and taped it to the white fan cover.
Here are some pics.


I used the cardboard insert from a dvd+r case and cut it to size. Now it seems that air flows thru the entire heatsink instead of just the back.
I know the DVD drive is supposed to kinda do the same thing but it's not close enough to the heatsink to work effectively.
You're probably thinking "Geewhizz Chuxty, what it the paper catches on fire?" Well, if you've done all the mods here then it shouldn't. If you are weary then just use some hight temp plastic or rubber.
Before this mod. I could only play a lap of PGR3 before it locked up and maybe 2 mins of 1 quarter in madden 07.
After this mod. PGR3 for an hour and madden 07 for an entire game and it still hasn't locked up once.
So basically here are the steps you need to go thru. Visit the tutorials for each one.
1.
THERMAL PASTE UPGRADE (MAYBE OPTIONAL)
2.
12v FAN MOD BUT USE THE 12V POWER FROM HERE

(IMAGE BY XBOXEXPERT)
3. APPLY HEATSINK SIZED THICK PAPER, LIKE PHOTO PAPER TO THE TOP OF THE GPU HEATSINK AND TAPE IT TO THE WHITE FAN COVER.
That's it! This has worked for me so far and I hope it works for you too!
This post has been edited by chuxterofdoom: Sep 21 2006, 08:33 PM