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Evga Gtx 295 hard vmod

post #1 of 5
Thread Starter 
Need help from the veterans, ive been interested in how to volt mod video cards recently after buying a dewar. A Diagram to show me where what needs to go to volt mod a 295 for nitrogen would help, but the principal behind how to find out what i need to do to increase vcore voltage is what im interested in. What do i need to have/know before i start?
   
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post #2 of 5
Well we need to know what revision you have? A single PCB or dual PCB 295.
2nd. The IC... I found this ADP3193A chip that should be on your card too! We are looking for FB.
Also found this thread that explains the mod well, but using VID.

I prefer VR modding where you use a variable resistor in parallel with FB (Feed Back pin) You can find that in the datasheet above. You just need to measure the FB with a DMM, multiply by 20 and you get the right VRs resistance for the mod (eg.: My FB is 600OHM. 600*20=12000. I need a 12000OHM VR or more for the mod!) measure/connect between FB pin and GND.

OCP is explained well in that thread so that's done. Solder the VR between OCP pin and GND.

RT is interesting too. That controls the frequency of phase switching. You can have fun with that if you want. Same as FB. Measure, multiply by 20 and you get the VRs value. Oooor you can just pencil the corresponding resistor to a lower resistance. Lower the resistance to 20-40% its original value (eg.: the resistors value is 40kOHM. Somewhere 24-32kOHM is optimal. But if you're not interested, you can just leave it.

Have fun with it!

EDIT: You can search for more info on Google! tongue.gif
post #3 of 5
Thread Starter 
I forgot there was two versions of the Nvidia gtx 295, ive got the single pcb not the radio active neuclear fireball lol. Btw what is frequency of phase switching?
   
CPUMotherboardGraphicsGraphics
Amd PHENOM II 1090T ASUS CROSSHAIR V FORMULA EVGA GTX 295 PNY GTX 295 
RAMHard DriveCoolingOS
PATRIOT SECTOR 5  WD CAVIAR BLUE 640GB HYPER 612+ WINDOWS 7 64BIT ULTIMATE 
MonitorPowerCase
SAMSUNG 24" 1920X1080 OCZ 1000W MOTHERBOARD BOX 
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CPUMotherboardGraphicsGraphics
Amd PHENOM II 1090T ASUS CROSSHAIR V FORMULA EVGA GTX 295 PNY GTX 295 
RAMHard DriveCoolingOS
PATRIOT SECTOR 5  WD CAVIAR BLUE 640GB HYPER 612+ WINDOWS 7 64BIT ULTIMATE 
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SAMSUNG 24" 1920X1080 OCZ 1000W MOTHERBOARD BOX 
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post #4 of 5
Great!
Well... Your card has 3 phases per GPU. They're not all working at the same time. They switch from one to another at high frequencies, so only 1 of those 3 phase is working for a tiny bit of time, then switches to the 2nd one and 3rd one. Imagine it's switching from phase 1 > 2 > 3 > 1 > 2 and so on at 250kHZ. Get the picture? I'm not really gonna explain how it works in detail here cuz that's gonna be a long story.
But I think you really don't need to mod RT, it already has DrMos MOSSFETS, they're good.
Are you up for the job?
post #5 of 5
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