Pics of my Modding ProjectI've opened up my "shimmed up" 6800U to take out the 4 (sorry, it's 4 shims and not 5) shims that I had put in it 6 months ago. Yes, the cards been used ever since without any problems.
Below I'll take you through my experience in removing the AS5ed shims from the 6800U.
Here's what you'll need (ArctiClean 1 and 2 is not need, if you have another solvent). T8 Torque screw drivers and an star screw driver (unless the card is already out of the system).
Before I started unscrewing the 4 spring-loadeded screws (named A, B, C and D), I used a permanent marker to mark the screw and a corresponding mark on the metal die.
This way I could measure how many turns it takes to unscrew all 4 completely. I measured exactly 6 complete revolutions for each screw (to loosen completely, of cause, making sure I unscrewed in order from A to D each time).
You will need these marks when you insert the shims and tighten the screws as they will guide you to tighten all 4 screws so that they exert an equal pressure on the shims and thus the shims sit complete flat on the chips.
Eventually, I'll be reusing the 2 copper shims on top of the memory chips in the 7800GTX.
Here is the pic with 2 copper shims (with blotches of AS5 where they once contacted the memory chip) still stuck with AS5 on the metal core (after unscrewing and removing the green part).
The Green part below shows the memory chips with corresponding AS5 blotches.
Now we see the underside to the 2 copper shims after I pulled them off the metal die.
When pulled off, notice that the AS5 is seen as blotches (as I used the "1/2 rice grain in center and squooch the shim on" technique instead of the "spread a thin layer" technique).
Now you see why my technique did not allow for the AS5 to spread all over to make a complete contact. So, I'll used the "spread a thin layer" technique when I re-apply the shims to the 7800GTX card.
Then, I removed the aluminum backing which still shows the two Sterling silver shims. Again, note that the AS5 was applied only as a grain in the center and then allowed to spread outwards (although in some cases not so evenly covering all the chip's surface).
Closeup of the backing with the silver shims still stuck.
Now, I pulled the silver shims off the backing
Note below is a top view of the setup of the 2 COPPER SHIMS (after I cleaned the old AS5 up with ArctiClean 1 solution).
Another view shows the how the Green part will eventually close like a book onto the other part with the copper shims (so that the memory sits exactly over the copper shims).
You must be wondering how thick the 2 copper shims must be so that the Nvidia chip sits on the copper (exactly) so that it does not break the chip or leave a gap.
Well, I had to use a strip of paper to measure the exact thickness of the copper shims. It took lots of patience to find the corrrect thickness for the 2 coppers shims (dimensions below).
I've replaced the 2 sterling silver shims with two slightly longer .999 silver shims (not that it will make an incredible difference, but I had the .999 silver handy and they're longer too). Yes, and that's just about as fancy as you can get....
Note the 2 .999 Silver shims are show sitting on the other side of the green part and after AS5ing (both sides of the shims) the black cover will fold over like a book.
And finally here are the dimensions of the 2 Silver shims. NOTE: You can use copper ones (just fine). I was just to lazy to find some thinner copper sheets to cut and used what I had.
I've tried to attach all the pics in the order that I found them (and i'm not sure how this will work, so bear with me). Let me know if you have any questions. I'm going to get some sleep now. Will install them in the 7800 tomorrow and test.