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Starting the easy way. Radeon 7000 with linear regulator.

post #1 of 6
Thread Starter 
Hi mates!

I'm starting to voltmod all my AGP cards to benchmark seriously on them (enthusiast league, watercooled) and I've decided to start with the Radeon 7000 64MB DDR.

Why this one? Well, because the main VR is linear, and as such, the power circuitry is extremely simple. A couple of resistors and a couple of capacitors, besides from the Nikos L1084S adjustable low dropout regulator.


Here's a pic of the board area, and the extracted circuitry.

450

247


So, tracing down the resistors and the pins, I've come to conclusion that I have to modify the 68X(R895, 50Ohm) marked resistor and add a pot in series with it.

Calculating, seems that the regulator is set at 1.88V, but will real-world measure that when the motherboard arrives. If I increase said resistor from its stock 50Ohm to 60Ohm, vCore gets boosted to 2V according to my math, and the increase seems to be linear with the resistance rise. In that case, a 20-ish ohm pot would be more than enough for my vcore needs.


Are my assumptions/observations right?


Thanks for the help in advance! wink.gif
   
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AGP bencher
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post #2 of 6
Everything looks ok apart from your vout calculation. Looking at the datasheet, the calculation is Vo=Vref(1+R2/R1) + Iadj*R2. Vref is stated as a nominal 1.25V, the Iadj*R2 term is negligible and can be ignored. Therefore Vo=1.25*(1+(100/50))=3.75V

You could replace R2 with a pot or add a pot in series with it. Alternatively you could lower R1 by connecting a pot in parallel with it (around 2k). The latter being a bit easier to solder.
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post #3 of 6
Thread Starter 
So, does this thing operate at 3.75V?! eek.gif

It must be manufactured in a very big process then O__O


I'll go grab a pot tomorrow and see what happens smile.gif edit: Waaait... 2k~ I have on the components drawer thumb.gif


By the way, gonna put together an ancient Sempron rig I must have somewhere in my room and measure how's the Vcore in real-world.


Thanks! wink.gif
Edited by Artikbot - 2/26/12 at 4:21am
   
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AGP bencher
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post #4 of 6
Quote:
Originally Posted by Artikbot View Post

So, does this thing operate at 3.75V?! eek.gif
It must be manufactured in a very big process then O__O
I'll go grab a pot tomorrow and see what happens smile.gif edit: Waaait... 2k~ I have on the components drawer thumb.gif
By the way, gonna put together an ancient Sempron rig I must have somewhere in my room and measure how's the Vcore in real-world.
Thanks! wink.gif

That's what I was going to suggest smile.gif It could be that you have the wrong regulator. That one could be for the DRAM or otherwise. I can't tell from your picture.
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Daily
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post #5 of 6
Thread Starter 
Uh! Forgot about this thread!!

Anyway, here's the tests:

The regulator gets juice from the 3.3V rail, so it means it can't output 3.75V.

I plugged the card and measured the voltage. It indeed outputs lower than that. Working voltage is 1.88V, measured at a random point in the ground plane and the tab of the regulator.
That has a lot more of sense smile.gif

Since the card overclocks so bad it won't be of any use in benchmarking (also discovered it's a 32MB, so I have zero chances frown.gif), I'm gonna go ahead and experiment with it, and see if I can successfully mod it.

Currently searching where does the VRAM get fed from, seemingly it's from that N-MOSFET upmost of the board, voltage at Source pin reads 2.48V.

The input voltage of that MOSFET is 3.35V, and gate is driven by a nearby transistor (update- it's a shunt regulator, not a transistor).

Being that said, I have absolutely no idea on how to modify the memory power circuitry. Basically because I don't know how do shunt regulators work redface.gif



Edit: Just soldered the pot to the 50ohm resistor from the GPU regulator.

If I decrease the pot value, the voltage goes down!!eek.gif



Edit2: Just soldered the pot to R894 instead, and BAM! 2.31V devil.gif

Worth mentioning I shut it down. Soldering a bigger pot as we speak. Don't wanna fry the board, at least not yet!!

Good news is, it booted up even at those volts.


Edit 3: While de-soldering R895 I accidentally broke it, and had to swap it with a 1/4W resistor. Works now, voltage's back to 1.85! thumb.gif

Let's see if the 47K pot on R894 has done something useful smile.gif


Edit 4: Success!! Adding a pot in parallel with R894 DID increase Vcore! But I lowered the value from 47 to 2K, for better accuracy. Right now it sits at 3/4 (single turn pot), and vCore rests at 1.92V.

I've effectively bumped corespeed from 315 to 340 and zero artifacts!! biggrin.gif

I'm doing a decent post so everyone can udnerstand and do this easy mod smile.gif
Edited by Artikbot - 3/11/12 at 10:33am
   
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AGP bencher
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post #6 of 6
Thread Starter 
So, to sum it up.


You'll need this:

-A fine tip soldering iron. I use a JBC 35W with a T05D tip.
-Soldering tin, obviously.
-A 2KOhm variable resistor, multiturn is recommended, but I'll do it with a single turn. This card isn't cutting edge tech, so there's no need for pinpoint accurate components.
-A multimeter that can read on a ~2V scale, accurate to the millivolt.
-A steady hand.


Okay, first of all, this mod is only likely to work with this particular kind of PCB. You might be able to reproduce it on other cards, as most of them share a 5A, low dropout linear regulator as a way to feed the core.

Please note I'm not responsible of any damage that might occur due to doing this mod!! biggrin.gif

Grab your card and locate resistors R895 and R894. They are near the NIKOS L1084S regulator.

Now pick a couple of cables and solder them to the terminals of R894. Then, solder the cables to the variable resistor, and glue it/place it wherever you want.

450

Ta-dah! Done smile.gif

370

Mind the other pair of cables going from R895, I disintegrated that one while figuring out how to do the mod, so I had to replace it.

The lower the resistance you set on the VR, the higher the Vcore will be. At a near-shorted resistor (5Ohm or so) vCore will be 2.3-2.35V, the maximum the regulator will allow (due to internal drop).
With the VR set at maximum value (2K) vGPU measured at the regulator tab should be around 1.83-1.84V.


Have fun! Meanwhile I'll figure how to do the vRAM mod.
   
AGP bencher
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AGP bencher
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MouseAudioAudioAudio
Logitech G9 ASUS Xonar DX Sennheiser HD555 SMSL SA S3 Desktop Amplifier 
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Kenwood KFC S1394 + Custom 10L Bass Reflex cabi... Logitech G25 
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