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Volt Modding an XFX GTS 250 1 GB

post #1 of 13
Thread Starter 
So have that card, here is the newegg link:

http://www.newegg.ca/Product/Product.aspx?Item=N82E16814150356

I'd like to volt mod it a bit as I'm grabbing an MCW60 and I'd like to take the card a little further.

Is there a way to skip vMeasure and just solder a regular resistor onto the board to give an unchangeable voltage increase? I'd just like to bump the volts by about 0.10.

I'd like to keep soldering to a minimum and if I could just get a single resistor and wire it on that would be great.
Edited by charliehorse55 - 12/26/10 at 8:09am
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post #2 of 13
Well the problem with having a fixed resistor is just that, Fixed! You must experiment with the voltage to get the best core clock as well as maintaining your temps within its limitation. My advice would be to solder on a connector so that you can swap out resistors if needed, eliminating the need to resolder another resistor on the card if the first one is incorrect
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post #3 of 13
Thread Starter 
Yeah I guess I will solder on two wires, and then connect a deistic to them. Any ideas on how much I should drop the resistance by to bump the vcore just a bit? I'm thinking a 10% drop would do nicely?
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post #4 of 13
Quote:
Originally Posted by charliehorse55;11790392 
Yeah I guess I will solder on two wires, and then connect a deistic to them. Any ideas on how much I should drop the resistance by to bump the vcore just a bit? I'm thinking a 10% drop would do nicely?

Well, that all depends on the resistance of the FB pin on your VR. First we need some pix of the front and back of your card(hi res) to identify the voltage regulator and guide you in measuring its stock resistance. Once we have that it is just a simple math equation to figure out what size resistor to use.
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post #5 of 13
Thread Starter 
Quote:
Originally Posted by Voltage_Drop;11790701 
Well, that all depends on the resistance of the FB pin on your VR. First we need some pix of the front and back of your card(hi res) to identify the voltage regulator and guide you in measuring its stock resistance. Once we have that it is just a simple math equation to figure out what size resistor to use.

Pictures on newegg link. Click on the picture of the graphic card and a viewer will open, you can zoom in really close and look at high detail pictures of the PCB.

Also, I asked what a good % drop would be. I know the formula for calculating resistance in parallel, so once I measure the resistance I can get an idea of what resistor to use.

I'm going to practice my soldering on an old FX 5500. The card still works so I'm going to try soldering wires onto random resistors. I won't connect the other end of the wires to anything, so if the card still works afterwards I know I made a clean connection.

I'd really like a picture highlighting what resistors to connect my wire too.
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post #6 of 13
Thread Starter 
Also, a better question. How much will I get out of this? I don't want to bump the voltage too much, but I do want some more performance. It does 800 core right now. With a mild vcore bump what clocks am I looking at?
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post #7 of 13
Yeah I already looked at those pix and they show nothing of the PCB and its components. How much you will get out of it all depends on your particular card and how well it OC's. The general rule of thumb is to find the FB resistance point and X20 to find the parallel combination which will put you back to stock and then you lower the variable resistor graduallly and then measure the voltage output and then test for OC. Trial and error, its quite simple actually once you do your first one, though time consuming. We must find the IC's for the GPU and VRAM to proceed. Practicing on an old card is wise
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post #8 of 13
Thread Starter 
Those pictures show the back of the PCB, do you also need a picture of the front.
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post #9 of 13
Sorry, I didnt see that pic. What is the #'s off of this IC?
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post #10 of 13
pretty sure you can increase voltage in bios, I can on mine no need for hard mod here.
    
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