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Sapphire 7870 XT (Tahiti) Volt mod/cap mod help (56k warning inside)

post #1 of 19
Thread Starter 
I just ordered a new soldering iron and I think I'm just going to sell my second xt and wait till the 8series comes out. So I want to volt mod my better clocker, and I haven't seen any mods for these anywhere.. yet.
I'm good with a soldering iron it's just I don't know much about electronics so I was hoping if some of you guys, whom are way more intelligent than myself, could help me out and tell me what all I would need to do in order to get this mod done.
I just ordered a nice temp controllable soldering iron (to replace my radio shack cheapy) that should be here in a couple days just for this project and I plan to water cool this card before putting the heat to it.

Here are the pics of the card (please let me know if you need more or if you need pics of the top of the pcb):
56k Warning: Big Pictures! They're 14mp images when opened in new tab. (Click to show)



I'm just waiting on some heatsinks and then I'll order the waterblock and whatever else needed for the mod.

Update:

Found that a volt mod is isn't of much use when you have voltage control and the cap mod didn't help with performance.
Edited by MikeMike86 - 5/20/13 at 7:17pm
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post #2 of 19
The CHiL controller on the back is the GPU voltage controller (bottom left in the last picture). What are the markings on this chip?
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post #3 of 19
Thread Starter 
Ok it took some bright light to read that little guy but I got it and a pic of it as well.

It says:
CHiL
CHL8225G
Q45860.1 15
U1210
THAILAND

Up close pic I took:

I never realized how bad my camera was at up close pictures. redface.gif

And the info I found on it from the web: Link to pdf download
Here's a chopped up pic, might not come out to well though:

Edited by MikeMike86 - 4/23/13 at 12:14pm
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post #4 of 19
You should be able to change voltage with Sapphire Trixx 4.6 without any sort of mod!
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post #5 of 19
Thread Starter 
Yea I know I was looking for more power! I've seen regular 7870s hit 7970 speeds so I figured I should be able to surpass that with a 7870 xt.
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post #6 of 19
If you're overclocking on air or water, the software control is perfect. Some cap mods will definitely help you squeak out 20-50MHz extra, but I'm not very good at figuring those out. You need Pizzaman or CL3P! Shoot him a PM and ask him to check this thread out.

Here are highres photos from TPU (open in new window for full resolution):



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post #7 of 19
"I just cahnt dhooo it cahhptan, ahh dooon hav thuuu powahhh".....

well johnny you need one of these....

http://www.overclock.net/t/1205435/bit-tech-evga-launches-epower-vrm-board

"that'll do donkey, that'll do...
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post #8 of 19

Red = +12v input

Blue = vMEM 

Yellow = GPUv 

Purple = either vMEM or VTT circuit.. not sure

Grey = IC and output stage for VTT

 

caps to use:

 

for +12v -> 16v 200-600uf

for vMEM -> 6.3v 200-1200uf

for GPUv -> 2.5v 250-600uf

for VTT -> 6.3v 200-1200uf

 

 

 

post #9 of 19
Edited my post above because CL3P is a master too!
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post #10 of 19
Thread Starter 
Quote:
Originally Posted by badtaylorx View Post

"I just cahnt dhooo it cahhptan, ahh dooon hav thuuu powahhh".....
well johnny you need one of these....
http://www.overclock.net/t/1205435/bit-tech-evga-launches-epower-vrm-board
"that'll do donkey, that'll do...
Lol the only thing is the $100 price tag and I don't think I want that much powa!
Never knew they made those though cool info!
Quote:
Originally Posted by CL3P20 View Post

Red = +12v input Warning: Spoiler! (Click to show)
Blue = vMEM 
Yellow = GPUv 
Purple = either vMEM or VTT circuit.. not sure
Grey = IC and output stage for VTT

caps to use:

for +12v -> 16v 200-600uf
for vMEM -> 6.3v 200-1200uf
for GPUv -> 2.5v 250-600uf
for VTT -> 6.3v 200-1200uf


Thanks for the info CL3P20! I will order some quality caps tonight!

-So I should just do a cap mod since water cooling won't be sufficient for more juice?
I plan on running this one card on a gtx480 Black Ice radiator with some high speed Delta fans (only using the higher speeds for benching of course, probably tune it down for actually gaming).

Thanks for the posts xxbassplayerxx!
I thought I was gonna be dead in the water for a bit there. biggrin.gif

Edit: Also so I don't screw it up just to clarify, I'm assuming I need caps on these points I marked with red dots? Or do I need to hit some of the even smaller ones as well?


Other than the obvious points where caps are on the other side of the board.
Edited by MikeMike86 - 4/17/13 at 5:15pm
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Custom dual loop water cooling, one for gpu and... ApogeeCPU block Windows 7 64bit Asus VG248QE 
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Microsoft Sidewinder x4 RAIDMAX RX-1200AE Corsair Vengeance C70 (black) MW3 G9X  
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Razer Goliathus Control Creative Recon HD  
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Intel Core i5 2500k ASRock Extreme 6 Z77  Sapphire 7950 GSkill Sniper 1333  
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WD Caviar Black WD Caviar Black Vertex 2 HP Light Scribe DVD RW 
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Cooler Master Hyper 212 Evo Windows 7 64bit AOC 1920x1080 Rosewill 
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OCZ Z Series 850W Modular NZXT Source 210 Pixxo Laser Razer Goliathus 
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Xi-fi Xtreme Music 
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