OVERVOLT GeForce

[KRYHAWOK]

Hi guys.
Does anyone know a way to overvolt my video card? I read some atricles about modifing Asus vc, but no one about my Creative.
Any suggestion is accepted!

TNX

[o770]

what r u talking about kryhawok? u mean to convert it for a quadro board?

[KRYHAWOK]

I don't know if we are talking about the same thing. Do you know how to modify the max voltage for a mobo (e.g. 1.85V ---> 2.30 till 3.00V)? Something similar, but applied to a Creative.
Now I'm looking for the article I read about the same mod. on an Asus... 3 min....

[KRYHAWOK]

Here it is: http://www.3ditalia.com/hwtech/overclock/gf2mxvcore.htm
(for Asus)

The article above is in Italian, it is similar to the following English article (but not the same!) here:

http://www.xbitlabs.com/video/geforce2-overclocking.html
(for Asus and Suma)

[o770]

kryhawok, i readed only part of the second website link: what ppl do there is regular video overclocking techniques till the voltage modification - here they increase the voltage to supply more power once the core and memory frequencies r higher than the stock ones. the difference is they do right in the board.
sometimes overclocked video cards will demand more power but the most common techinique i know is to increase VIO voltage which affects most of the computer components (RAM, chipset and everything plugged in the mobo) and also the PCIs and AGP where the video card is.
the way described on that page will increase the voltage only for the video card - what is great i think, but also a bit harder.
this is all i could figure out from what i readed.
hope this help.

[o770]

Originally posted by KRYHAWOK
Hi guys.
Does anyone know a way to overvolt my video card? I read some atricles about modifing Asus vc, but no one about my Creative.
Any suggestion is accepted!

TNX

u will only need more power in order to resolve instability problems when overclocking (a general rule - also for the video card).
if you not intend to modify the voltage that way described in the second link id recommend you to overclock yours using the traditional way (driver and coolbits) till it gets faster and still stable. then you can stop in my opinion: if u wont modify the circuits of the board the only way i know to increase the power will be VIO voltage which is surely more complicated to adjust well.

[KRYHAWOK]

I don't think I already reached the limit for my gpu at my current temperature. I put on it a coolermaster (5*5*1 cm @ 4300 rpm), and it's quite cold even at 200@245; I can set 250 but it isn't stable and I didn't try more for now. The limit is low voltage.

I need to put heatskins even on the ram (I've just prepared two of them): 460 is a temperature limit, not a voltage limit (the opposit of gpu).
The video card RAM takes power directly from the 3.3V - 3.5V - 3.7V mobo line, without any voltage control by the video card: I can set it on the mobo. Instead, the gpu voltage is controlled and modified by my Creative.

That's why I need more volts for my gpu.... but where can I find such modify?

ZzBYEzZ

[Karsta]

Search the voltage regulator chip on your card, write down its code (like US 3007CW -Asus V7700 has that one). Then search with Google its data sheet and possible application notes. Use Google because it can find pdf files. Read those data sheets and compare to other voltage mods made. If you use variable resistors you can adjust the voltage to right value without knowing the exact value of resistors used on card.

And Wellcome to forum!

[KRYHAWOK]

Thanks! I'm Italian, and I usually post at www.hwupgrade.it. But I wanted to "spread my culture" here :D :D ... and to test my awful English of course!

Unfortunately, I'll see my pc only tomorrow afternoon. However I'll check soon.

ZzBYEzZ

[Karsta]

I am Finnish - so my english is not perfect either. Hanging on the forums is good practice.

I have made core and both memory mods for my GF3. When doing it I found out that the resistor values given for this card (Asus V8200d) on x-bit labs article were not the same my card had. So it is always better check it by yourself.

Data sheet or application notes will give you typical values for the resistors. That gives an idea about the range you are in. Those papers also give you pins to be soldered and the equation how to calculate the voltage.

The resistor to be soldered will be parallel to original resistor on the board so you have to calculate the resulting value from the equation 1/R = 1/R(orig) + 1/R(added).

It would be good to have a multimeter when doing the mod. With it you can check the actual voltages your card generates while you are adjusting the resistor. It also can give you some idea about the resistors used. With it you can also check that you're circuit works before starting up the computer.

With magnifying glass you can try to check how the traces are running from the regulator chip to other components. Comparing to circuit diagram gives you the right resistors which codes you can try to check. I am not sure that these are always true because different resistor manufacturers use different markings but it goes like this:
two first numbers give the value,
third number or letter will give the multiplier: 0 = 10^0 = 1, 1 = 10^1 = 10, 2 = 10^2 = 100... and A = 0, B = 10, C = 100...
the first number can be left off if it is 1
some examples:
101 = 100 ohms
102 = 1000 ohms
121 = 120 ohms

02C = 10200 ohms
15E = 1.5 Mohms

Hope this helps you to get started

[Maximus Nickus]

Be careful, you can get adapters so you don't have to solder the resistors on you just clip em on!
Go to "get your volt mods here!" IN THE MOTHERBOARDS SECTION FOR INFO.
Good Luck:)

[KLowD9x]

Originally posted by KRYHAWOK
I don't think I already reached the limit for my gpu at my current temperature. I put on it a coolermaster (5*5*1 cm @ 4300 rpm), and it's quite cold even at 200@245; I can set 250 but it isn't stable and I didn't try more for now. The limit is low voltage.

I need to put heatskins even on the ram (I've just prepared two of them): 460 is a temperature limit, not a voltage limit (the opposit of gpu).
The video card RAM takes power directly from the 3.3V - 3.5V - 3.7V mobo line, without any voltage control by the video card: I can set it on the mobo. Instead, the gpu voltage is controlled and modified by my Creative.

That's why I need more volts for my gpu.... but where can I find such modify?

ZzBYEzZ

460 degrees ferinheit?(sp?)

[funnyperson1]

hes probably saying that 460 is a speed he cannot attain because of temperature...

[KRYHAWOK]

Originally posted by KLowD


460 degrees ferinheit?(sp?)

I mean, I cannot break the 460MHz wall without hs...
However, I'm about to put my Geffo out of the case: I'll have a look for the model number of the chip that controls the voltage.

Just for statistic, what are the best frequences reached with a Geffo, similar to mine, that you have ever seen?

[Samzik]

man this is some hevy s... ! im going 2 test it on my gf 1 when it costs 50@ or less ;) :burn:

[YMAN]

Doesnt your bios have a setting called I/O voltage or such?
This will up the volts on the AGP, memory, chipset...
Or is your card a PCI?

[Karsta]

Originally posted by YMAN
Doesnt your bios have a setting called I/O voltage or such?
This will up the volts on the AGP, memory, chipset...
Or is your card a PCI?

It is different from GPU (display card's CPU) voltage which is regulated by the display card itself. For GF2 it is 2.0V. Also display card DDR ram uses 2 different voltages of which one is 2.5V and regulated by display card and 3.3V which can be regulated by VIO on mobo (it is not necessarily so, and is not so for GF3. Asus GF2 uses VIO voltage but it runs via the display card voltage regulator). If AGP bus uses VIO depends on which AGP version motherboard has. Newer AGP bus does not use VIO but 1.45V (if remember right) which is regulated also by motherboard but is not bios afjustable.

[KRYHAWOK]

Ok, I've just had a look at my Creative and I discovered that its voltage chip is the same as Asus, I suppose. This is what I found:

UNISEM
US3007CW
0112

Is this really the same as Asus card (I took for granted that Asus and Crtv chips were different)? If yes, do you think I can apply this modification (http://www.xbitlabs.com/video/geforce2-overclocking.html) on my Crtv as well safely?

[Karsta]

You can apply it but not safely...

Your card has probably different resistors than the card used on x-bit labs page. Even the circuitry can be different. I looked at my broken Asus V7700 and noticed that it has different resistors from the ones used on the article plus it has one mosfet more! It has also memory from different manufacturer. So if one company changes their voltage regulator circuitry for the same brand card (this true also for Asus GF3 V8200d) how could different manufacturers have same circuitry?

Also it can be seen from the pictures that three of the four regulator circuits on the US 3007CW are used on Asus card - they mention only two of them - what is the third voltage (the one meant for Vcore regulation)?

It is better to check the actual voltages your card uses with multimeter (between ground and approriate capacitors on card). And try find out the resistors used.

[KRYHAWOK]

Unfortunately, I don't have any multimeter for now, but I could ask a friend.
The "safest" modification would be suggested by an article written specifically for my Crtv, but I didn'y manage to find any, for the moment....

[Karsta]

Yeah "safe"... it's never

Thus far I haven't gotten much more megahertz with voltage mod on GF3 but I have a cooling problem (currently default heatsink) so I can't raise voltage so high -should quite much more. It is not said that you'll get more with volt mod. My GF2 didn't overclock more even though I lowered the temperature over 10°C (default voltage). They don't seem to act quite like CPUs.

Multimeters, if you can't borrow, can be really cheap if you are lucky to find a good shop. In my opinion it is not good to do that mod totally blind.

[KRYHAWOK]

In the Italian review I cited above, they reached 262 mhz (on a geffo2 MX) @2.5V, while they obtained only 230mhz @2.05V. Of course, @262MHz, the video card is bandwidth limited, so the performance improvement is strongly limited by ram freq.....

[Samzik]

Originally posted by KRYHAWOK
Unfortunately, I don't have any multimeter for now, but I could ask a friend.
The "safest" modification would be suggested by an article written specifically for my Crtv, but I didn'y manage to find any, for the moment....

... costs about 10-15 $