Chaintech Geforce 4 mx440 vmod?

[azari]

Hi there. Ive been looking for a vmod for my chaintech mx440. Unfortunatly, the mod thats on vrzone will not work because the voltage regulator is a different chip.

Here is what my board looks like:

<a href="http://overclock.blacklighthosting.com/DSC00146.JPG">http://overclock.blacklighthosting.com/DSC00146.JPG</a>

Help would be greatly appreciated.

Thanx in advanced,
Azari

[persivore]

Can you post a picture of the back of the card please.

[azari]

Here are a bunch of pictures of the card:

<a href="http://overclock.blacklighthosting.com/DSC00167.JPG">http://overclock.blacklighthosting.com/DSC00167.JPG</a>
<a href="http://overclock.blacklighthosting.com/DSC00168.JPG">http://overclock.blacklighthosting.com/DSC00168.JPG</a>
<a href="http://overclock.blacklighthosting.com/DSC00169.JPG">http://overclock.blacklighthosting.com/DSC00169.JPG</a>
<a href="http://overclock.blacklighthosting.com/DSC00170.JPG">http://overclock.blacklighthosting.com/DSC00170.JPG</a>
<a href="http://overclock.blacklighthosting.com/DSC00171.JPG">http://overclock.blacklighthosting.com/DSC00171.JPG</a>
<a href="http://overclock.blacklighthosting.com/DSC00172.JPG">http://overclock.blacklighthosting.com/DSC00172.JPG</a>
<a href="http://overclock.blacklighthosting.com/DSC00173.JPG">http://overclock.blacklighthosting.com/DSC00173.JPG</a>
<a href="http://overclock.blacklighthosting.com/DSC00174.JPG">http://overclock.blacklighthosting.com/DSC00174.JPG</a>
<a href="http://overclock.blacklighthosting.com/DSC00175.JPG">http://overclock.blacklighthosting.com/DSC00175.JPG</a>
<a href="http://overclock.blacklighthosting.com/DSC00176.JPG">http://overclock.blacklighthosting.com/DSC00176.JPG</a>

[asterix]

I have the same card, and I'd also like to do this. Is it easy? and is there much of a risk in doing it?

[Holst]

Can you tell me what the chip ive marked with ? is

Can you also check that the point ive marked as VGPU? is vgpu.

[SSJ5]

I am not sure but i think that the chip that you should test and mod is the one marked in the pic:

[persivore]

I think the regulators are probably going to be the LM324's on the back of the card. If you check the voltage at the point Holst marked, can you also check the voltages at the points I've marked please.

[Holst]

SSJ5 - That is just a standard mosfet, the driver is elsewhere.

You might be right about the LM324's persivore, problem with those buggers is that they are so versitile... can use them for filtering as well.
They might also be Vref for memory.

[haPpydUde]

Welcome to xs john, and justin :toast:

[asterix]

Thanks, by the way. Where is the ground on the card?

[Holst]

The PCI bracket will be grounded (big silver bit you screw onto your case)

[azari]

here are the voltages for the marked points...some of them seem out of whack to me, but i tripple checked everything...

[Holst]

Looks like the one on the right is the vreg then, good call persivore.

Can you please measure the resistance of SR17 and SR18.

They look like the voltage devider for Vcore (if it is 2.5v)

Can you please check the voltage in my previous post to be sure, id also like to know the identity of that hidden chip.

[kryptobs2000]

I think the regulators are probably going to be the LM324's on the back of the card. If you check the voltage at the point Holst marked, can you also check the voltages at the points I've marked please.

Trying myself to learn how to find vmods. What made you choose those 2 legs? Did you look at a datasheet or is it normally those on all vr's or what?

[asterix]

My guess is he looked at some information that describes which IC's do what.

[persivore]

Trying myself to learn how to find vmods. What made you choose those 2 legs? Did you look at a datasheet or is it normally those on all vr's or what?
On this card, the LM324 is set as a voltage regulator. There are 4 'regulators' on the chip. Each of the regulators on the chip has 3 pins - a reference voltage, the feedback voltage from the output of the regulator, and the control voltage from the regulator, which controls how much voltage the MOSFETs give out. The regulator will try to keep its reference voltage at exactly the same voltage as the feedback voltage from the regulator output.
From the picture it looked like only 1/2 of the chip was being used, so I based the 2 points on the pins which would have been used for the reference voltage.

[Holst]

The other half might be used for regulating memory Vref.

[azari]

SR17 - 120 ohms
SR18 - 120 ohms

Mystery chip -
250P05AV
93388

Also, i could not find your post that was asking me to check voltages Holst...

[Holst]

Can you tell me what the chip ive marked with ? is

Can you also check that the point ive marked as VGPU? is vgpu.

I cant find any info on the chip I marked, can you take a picture as the manufactures simbol may help me ID it.