General GeForce 210 vmod thread - Page 2

Next up is an Asus EN210 SILENT/DI/512MD3(LP).

Stock votlages:
core: .9-1v
mem: 1.49v

So this card is a bit tricky. There where a few chips on the top of the board that looked like contollers, but turned out to be linear regulators. The vrm controllers are on the bottom of the board, and are small little 16 pin square chips. There where just a few letters/numbers on the chips, but nothing that could tell me what they where. So a blind mod was attempted. The bottom inductor goes to the core, the top to the mem. The chips are located on the back near their respective inductors.

I measured all 16 pins for resistence to ground, looking for something that would give me an indication of feedback resistance (mainly looking for something in the 2k or less value). On the bottom chip, I found a pin with 1.1k to ground. It also had 1.1k to the inductor, so this looked like appeared to be the FB pin (if there was not a similar resistance value from the pin to the inductor, it would not have been FB). Probed around the chip and found two suitable solder points. Using a 10k vr, I was able to change the voltage up! Success! . Core ran about 930mhz in Aquamark with 1.2v, staying below 50C.

The mem chip appeared to be the exact same chip, so I measured the resistance in the same place. It read 4.8k to ground and 4.8k to it's inductor. A bit high, but the other controller worked, so this one should too. I will use a 50k vr on this one. Have not tried the mod yet.



More details to follow.

Do you have a voltmeter?

Very nice pictures

Here are the mod points and read points. Both controllers are the same, so the mods are identical. Without a certain resistance readings, it will be a somewhat blind mod. I've dealt with these exact same controllers before, but every application is different. I've used a 10k vr in the past on these.


Resistance reading needed for a proper/good mod:

-resistance value from pin 4 to ground, on each controller. This is to size the vr properly for the resistance that is on the board.
-resistence reading from points labled 1,2,3,4 to the inductor pin shown. This is to find out which controller is for vcore and vmem. Alternately, you could just measure the voltage at the inductor pin.

Mod details. FB pin is 4, a good ground pin is 12. 7 works also. Connect your vr from 4 to 12. Voltage read points are on the positive leg of the output filter caps, the inductor pin closest to the core, or the other solder ball near the controller (you can see the PCB trace from the inductor output power plane back to the controller).



High res: http://cdn.overclock.net/1/14/146cde21_untitled.png
Edited by just_nuke_em - 10/24/12 at 2:57pm

10k is ideal, but 20k will work. If it's a single turn pot, then things will get difficult since the vr will only start to take effect when it reaches 10k ohms and lower. At that point you are already halfway through the range of the pot. A multiturn pot would be better.

You will have plenty of resolution with a 20 turn, even if it is a 20k