XFX 9500GT 1GB volt mod [56k WARNING] - Page 4 - Overclock.net

crashdummy35 · 4 Weeks Ago

Ah okay.

Let me go see what I can get going now.

crashdummy35 · 4 Weeks Ago

I colored that one black and it raised the ohms..?

The one I marked, if I just draw 3 lines along the side with a mech pencil the ohms go from 990 to 931/932.

But the voltage at the caps never goes above 1.14..? Not that point next to the gpu either..? Man I hate this card.

**CL3P20** · 4 Weeks Ago

Wait a minute..Im lost now, I thought you already soldered GPUv mod on...and it was working...

I thought we were just working on vMEM...

crashdummy35 · 4 Weeks Ago

U501 was the mem controller. This one is the gpu controller. I pulled the vmem mod because it was lame (elixir RAM chips) remember? The 1.79v they had stock was almost the max they were rated for: 1.8v +.2 variation. Even with the mod I couldn't break 600MHz on the mem.

crashdummy35 · 4 Weeks Ago

Hold on, my cousin is here. I'll have to get back at this tomorrow.

Have a good night bro.

**CL3P20** · 4 Weeks Ago

Well since both of the controllers are the same...and the layout around the IC is the same..we can use the completed vMEM mod to help us..let me explain:

We have already changed resistance at pin4 to get more vMEM...what we need to do right now, is trace the path of resistance from pin4->into the surrounding resistors..basically a "road map" of the vMEM circuit and resistances...then we compare to the GPUv circuit. While the resistances will not be the same [from the 501 as the 503], we will be able to see the similarities between them, and 'follow' the mod point.

PizzaMan · 4 Weeks Ago

Just noticed. The first and second pics in OP are pointing to different pins. Which pic is correct?

**CL3P20** · 4 Weeks Ago

its the 2nd pic [pin4 from 'top' or left side to right].

crashdummy35 · 4 Weeks Ago

U501 (the upper controller) gives readings from pin #4 to pin #7 of ~556 ohms. That mod worked. But, CL3P20 checked the specs on my RAM chips and they are rated for 1.8v with a .2v deviation. Even at almost 1.92v the RAM was showing no gains. Literally 0 MHz gain.

U503 (the lower controller) gives no reading from pin #4 to any ground--not pin #7 or any other ground point. It's pin #6 that gives a reading of ~990 ohms to pin #7 or any other ground point. So I was trying to get the wire onto the pin #6 but was having trouble (burned my pcb a little) and after boot it would shut down on it's own--with the VR tuned to ~49.85k (50k VR) it went down to 885 ohm after it was wired into the circuit. I couldn't even get a v reading because as soon as Windows was done loading it would shut down and go into a boot loop. (Pict of the mod attached)

Finally I pulled the VR and started penciling to find the right Res below pin #6. In the attached picture the one in red shows the one giving me the best results--I got the ohms down to about 885 but the volt readings wouldn't change---1.14v was the highest I got. But, I was able to break 800 MHz and run stable for a bit. 815/825MHz both gave failure after like 10/20 mins in COD4. *The little yellow circle shows the slight burn I did to the pcb.*

My DMM has no "Continuation" setting so it makes it hard because I can't see any traces to follow the points to each other.

The Res marked in blue (you can still see a bit of pencil above it) actually raised the ohms to over 1000 when penciled.

Now I see why nobody vmods XFX cards...

I wish this one had that Primarion controller on it.

PizzaMan · 4 Weeks Ago

Quote:

Originally Posted by crashdummy35

My DMM has no "Continuation" setting so it makes it hard because I can't see any traces to follow the points to each other.

My DMM is the same way. Just set it to 200K and when you see "-0.00" then you have a continuation. Hope that helps.

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XFX 9500GT 1GB volt mod [56k WARNING]

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