8800GT volt mod (help)

[OpTiX]

ok so i've looked at all the volt mod guides this is the best i found (http://forums.guru3d.com/showthread.php?t=247576) and such but my 1kΩ pots are 25 turn and i see most people using 15 turn pots does that
make a difference and also how would i know where to solder which wire on the pot seeing as mine is totally different than most pots.
http://img36.imageshack.us/img36/3778/41243831.th.jpg (http://img36.imageshack.us/i/41243831.jpg/)http://img7.imageshack.us/img7/9403/68450463.th.jpg (http://img7.imageshack.us/i/68450463.jpg/)

[K404]

Hey :) Your pots look pretty standard to me.

25Vs 15 turn makes very little difference. It just means that yours changes resistance a bit less with each turn- thats more control so thats fine :)

As for how to wire it up- use the middle leg (the wiper) and one of the outside legs. Doesnt matter which outside leg. When you've picked the legs (I always fold the unused one over,) turn the screw so all the resistance is between those 2 legs. That means that you'll start with the minimum possible voltage increase. If you're not sure about which way to turn, press your multimeters probes against the legs and make sure the resistance is getting bigger... :D

The speed of voltage increase will get faster as you tune the resistance down, even with a 25-turn trimmer :)

[loonym]

The speed of voltage increase will get faster as you tune the resistance down, even with a 25-turn trimmer :)It's for this reason that I've taken a liking to single turn trimmers for a lot of my pojects.

[OpTiX]

ok so i encountered a problem my board is not of reference design its a evga 8800gt with the dual slot cooler. what to do now?
http://img195.imageshack.us/img195/1818/96352279.th.jpg (http://img195.imageshack.us/i/96352279.jpg/)


http://img37.imageshack.us/img37/2319/27620653.th.jpg (http://img37.imageshack.us/i/27620653.jpg/)

http://img33.imageshack.us/img33/1792/39022972.th.jpg (http://img33.imageshack.us/i/39022972.jpg/)

http://img196.imageshack.us/img196/6021/74927514.th.jpg (http://img196.imageshack.us/i/74927514.jpg/)

http://img132.imageshack.us/img132/6802/89068663.th.jpg (http://img132.imageshack.us/i/89068663.jpg/)

[K404]

loony... are you using logarithmic trimmers? :)

OpTIX.... please can you get a closeup of the two control chips in your 2nd pic? :)

[OpTiX]

i hope these pics can help
http://img193.imageshack.us/img193/7614/83050491.th.jpg (http://img193.imageshack.us/i/83050491.jpg/)http://img40.imageshack.us/img40/9065/76978500.th.jpg (http://img40.imageshack.us/i/76978500.jpg/)

[K404]

Pin 4 is feedback :) To double-check, measure the resistance between pin 4 and GND, multiply that by 20 and thats the trimmer value you'll need :) If you already have a 1K trimmer waiting to go, im guessing you've already done that? :)

I think the IC for your GDDR is on the back. Whats the code on that? :)

[largon]

It's for this reason that I've taken a liking to single turn trimmers for a lot of my pojects.:confused:
With a single turn trimmer the change in Ω/degree is even larger so you'll only inflate the problem?

[OpTiX]

Pin 4 is feedback :) To double-check, measure the resistance between pin 4 and GND, multiply that by 20 and thats the trimmer value you'll need :) If you already have a 1K trimmer waiting to go, im guessing you've already done that? :)

I think the IC for your GDDR is on the back. Whats the code on that? :)

yeah did that first part, i dont really care about modding the vmem im gonna keep that at 950 or so

[OpTiX]

:confused:
With a single turn trimmer the change in Ω/degree is even larger so you'll only inflate the problem?

yeah strange