nVIDIA reference GeForce GTX 480 Mods

[BenchZowner]

Be excited now folks!
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!

[saaya]

bump

[BenchZowner]

Are you trying to make me post the OCP hardmod ?
It's not worth it since you can override OCP via BIOS / software ( the new GPU-z has an OCP command line parameter for it ).
For the hardmod you have to replace 5 or 6 ( I don't remember, gotta remove the insulation from my card to check again ) resistors and add new ones or VRs there.

Oh, at least I can add the Vgpu hardmod since it's verified now

I'll be right back

[BenchZowner]

Okay... post #1 updated!

[mk-ultra]

thx mate

card is flashed, and still working great...obviously but just to confirm

so you edited ovp/ocp out from bios
and unlocked voltage comes from cracked smartdoctor?

[BenchZowner]

BIOS instructs the CHL 8266 to disable OCP & OVP.
BIOS is also modded to allow higher voltages in normal ( non-modified ) applications like Afterburner & SmartDoctor ( you get more than what you used to get with the same app ) and with the unlocked SmartDoctor you can apply up to 1.6V ( while it ain't beneficial at all, the effective range of the GF100 voltages is 1.25V to 1.35V [ and maybe a few cards can gain some more MHz up to 1.4V ] ).

[FatAlbert]

Dear BenchZowner, I think you as extreme bencher could show ocp mod for other extreme bencher

you should know about what I'm talking <- Click!

nice that you share the bios

[AndreYang]

Dear BenchZowner, I think you as extreme bencher could show ocp mod for other extreme bencher

you should know about what I'm talking <- Click!

nice that you share the bios

That's BS if this gtx 480 ocp mod, tool and bios are from me.

[FatAlbert]

Well, Andre, I don't understand why you are attacking me in that case if this is from you

I didn't write the mods are from BenchZowner or I'm blind

If you talks about the part "nice that you share the bios ", that's ok, but I didn't see your post with the mods. In that case thanks goes to you for the mod, but I was referring to that BenchZowner share the files with the mod. I didn't know that you gave BenchZowner the mods, sorry.

if anything more please pm me.
eot

[BenchZowner]

OCP Hard mod added.

[AndreYang]

Well, Andre, I don't understand why you are attacking me in that case if this is from you

I didn't write the mods are from BenchZowner or I'm blind

If you talks about the part "nice that you share the bios ", that's ok, but I didn't see your post with the mods. In that case thanks goes to you for the mod, but I was referring to that BenchZowner share the files with the mod. I didn't know that you gave BenchZowner the mods, sorry.

if anything more please pm me.
eot

Your statement is not correct if you don't know where BZ got this source. You'll hurt this source, especially you quote my words and I am the provider.

[FatAlbert]

Please, we should stop this discussion. I don't know the details, I wrote my posts with the informations that I had, if it's different ok. I can simply delete my posts. No problem. Sorry goes to your "source" if I did something wrong to him.

[dinos22]

does that GPUz temp adjustment work for you now or are you still stuck at cold slow down at -50 or whatever it was?

have you tested the hardmod?

i dont have any 480s myself just interesting how you're going with that issue

[BenchZowner]

does that GPUz temp adjustment work for you now or are you still stuck at cold slow down at -50 or whatever it was?

No, it doesn't work, because the temp sensor that GPUz offsets is not the one that causes the cold slow.

[dinos22]

strange because i think some dude said it helped him on here

[BenchZowner]

Nah it doesn't.
I can guarantee you that

[mk-ultra]

thanks for the precision BZ

[G-Man]

Does this bios work on the gtx470 and unlock all the voltages in the same way?

[BenchZowner]

No.
It's not meant and won't work for the GTX 470.

[Leeghoofd]

Thx for going against the stream (again) Bill, much appreciated...

[Splave]

BZ for presidente

[matose]

Thanks Bill, you are a great man

The cold slow mod must be revealed and then we can all start to bench GTX480

[Hondacity]

BZ is the man...i'm up for the mod too

[BenchZowner]

Updated with the Cold Slow Bug BIOS fix.
Check the first post, and let your card enjoy a cold summer day at -190C

[miahallen]

Nice

Thanks George