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nVIDIA reference GeForce GTX 480 Mods

post #1 of 30
Thread Starter 
Yes, be excited now
Actually I'm still in the process of finding the damned data sheet of the controller used on the reference GTX 480's, CHiL Semiconductor's CHL8266.
If you know somebody who can get the datasheet please ask him to give it to us so we can figure out all the mods.

I think I found the OCP mod, but I'm not 100% sure because I don't know if the pin configuration of the 8266 is the same as 8316's, so I'm not going to post it before I get a confirmation myself or from a brave friend :

Some good news, it looks like the CHL8266 is fully programmable via SMbus ( VID, OCP, OTP, OVP ), so if somebody with the necessary coding knowledge can pop in here we'll be able to change the Vgpu, the OCP and OTP & OVP on the fly via software.

Update 07/14/2010
No GPU OCP/OVP Firmware

You can disable OCP via software ( flash the CHL8266 controller with a modified firmware which disables OVP & OCP ) [ you still need to do the MEM OCP mod, this disables the OCP for the GPU core only ].
No need to run GPU-z and co, just flash the CHL8266 once and you're done forever

You'll find the necessary files and instructions in the linked RAR archive file:

CHiL 8266 Disabled OCP Firmware - Download from BenchZone
CHiL 8266 Disabled OCP Firmware - Download from RapidShare


Cold Slow Bug BIOS fix
Thanks to George "Hipro5" T. the Cold Slow bug fix is out in the wild.
Flash your card ( info in READ ME FIRST.TXT ) and enjoy.

nVIDIA GeForce GTX 480 Cold Slow Bug BIOS Fix

OCP hard mod *not tested yet though, the risk is yours*

original photo courtesy of TechPowerUp.com

No OCP, No OVP ( Unlocked Voltage adjustment ) BIOS & Tool

Download from: BenchZone or RapidShare

-- if a manufacturer wants to f* with somebody f* with me, come on

Summary, added 07/14/2010
To sum things up, if you want to do some extreme overclocking with a GTX 480 all you need to do is:

1) Flash the card with the ColdBug fixed BIOS ( BIOS #1 by Hipro5 ) [ download links above ]
2) Flash the CHL8266 controller with the No OCP/OVP firmware ( BIOS ) [ download links above ]
3) Do the Cold Boot Bug ( CBB ) mod as illustrated by Kinc ( mod guide pictures to be added in this post later )
4) Do the Vgpu ( GPU Core Voltage ) mod as illustrated by... numerous people ( mod guide picture to be added in this post later )

*You might have to do the MEM OCP mod, it's a hit 'n' miss thing, some people need it, some don't* ( mod guide picture to be added in this post later )

Enjoy!
Edited by BenchZowner - 7/15/10 at 2:44pm
post #2 of 30
sub'd

I'll take a closer look at this laterz. Do you have a pinout of datasheet handy for that?
    
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post #3 of 30
Yea, no body is giving up the pinout/datasheet

Got a source link for the OCP you posted?

Thanks for the BIOS DB fix Hope is works.
    
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post #4 of 30
Thread Starter 
OCP/OVP/OTP/CSB fix BIOS works fine, tested by me, and a few more benchers

I don't have the datasheet for the stupid CHiL controller too, I just found the datasheet of what seems to be the same controller but without the i2c interface, and I worked my way through it, and risked a card yesterday to verify it ( it worked ).
I found the OCP hard mod, so the source is here

I'm working on a CBB fix now ( CBB aka Cold Boot Bug ).
I'll find the Vgddr5 mod ( Vmem ) and add it here as well asap
post #5 of 30
vMEM is already posted in the Essentials thread
    
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post #6 of 30
OCP is still enabled on my 470. I get no higher clocks with this BIOS even if I set the voltage to 1.13
    
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post #7 of 30
Thread Starter 
This BIOS is not intended and won't do a thing for the GTX 470 mate.

OCP kicks in at 1150MHz+ GPU Core clock in combination with a Vgpu ( GPU Core Voltage ) of 1.25V or higher.
post #8 of 30
+1 Rep thanks for this.
post #9 of 30
Then why does increasing the voltage above 1.087v not change temperatures? I think the OVP kicks in right at 1.087v for the 470.

Also E-leet has PWM modification for 480s. What does that do?
Edited by chatch15117 - 6/7/10 at 2:43pm
    
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post #10 of 30
Thread Starter 
Quote:
Originally Posted by chatch15117 View Post
Then why does increasing the voltage above 1.087v not change temperatures? I think the OVP kicks in right at 1.087v for the 470.
If OVP kicks in you'll be left with a blank screen ( OVP/OCP trigger a power off signal on the controller, and stops supplying the GPU with voltage ).

Quote:
Originally Posted by chatch15117 View Post
Also E-leet has PWM modification for 480s. What does that do?
It changes the switching frequency of the PWM, might help in extreme overclocking ( LN2 ) [ don't know if it actually works though ]
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