DC/DC converter is IRU3033 from International Rectifier that integrates dual channel DC/DC converter. First channel (with inductor) is for GPU Core Voltage. The second one for DDR Memory. Memory voltage is probed from Vfb2.
R612,Ohm Memory voltage,V Approximately Maximum Frequency, MHz
180 2.50 450
150 2.75 500
130 2.98 550
GPU core voltage is probed from Vfb1.Default GPU core voltage is 1.50V. The voltage division resistors is on the front side of PCB and soldering there is not the easy way, so for GPU core I decided to add potentiometer in parallel with Rb. Here is table for GPU voltage. Rx is total resistance of Rfb1b in parallel with our potentiometer (5Kohm piher). I am running my MX440 with GPU at 350Mhz (1.85V) and Memory at 550Mhz (2.98V). I'm sure that this is still safe and very stable setting with a little better cooling.
edit: im running 420core and 650mem defalt voltage
i cant find the DC/DC converter is IRU3033.
Or look on a Pentium, Pentium II, or Pentium III board-- it is a 5V to 3.3 V rectifier on an SOIC DIP 2X4 leg pattern. But International Rectifier WILL sell you just one direct if you want.
Uh, matt.... I do not understand.... The card you have matches this (right?), and it is already an 8X card as it is an MSI 8888 chipset MX440-8X. So, mod not needed.
Except, yours looks like it is missing a chip... Possibly an important one.... Can you post a pic of the whole card????
None of the Gainwards match perfect either, but the UPC mfr traces to Gainward's anonymous OEM or previous name of CardExpert Technology. And those with that blank and look are the ones with that Ok sticker size and color-- which are 8X already.
DEFINITELY need to see the whole card you have.
Confused, but looks like you have an 8X card now which has had parts stripped off of it.
The only core mod I could find was for taking 420's to 440 rates. That is where the rectifier which you could not locate on your card came into use-- and it was part of the mod itself.
Your card has a major IC and a timing-crystal-like long signal rate sync module missing as opposed to the retail Gainwards I could find-- I crawled their whole site. I suspect they have the wrong pics up on the web for some cards-- in fact am sure of it, as what they showed on their corporate site for what you actually have is a pic for something not at all like your card layout.
So, do you want to have a better card with a mod??? Actually, the part under the fan is coremost chip. The chip missing is typically missing on video cards with slower RAM or a PAL\NTSC TV Out signal convertor not present.
So, I think you have an 8x and you know so, so what do you want to do??? what is the end goal of the mod you want to make???
The big square IC converts either DVI to PAL\NTSC or one of the latter or straight CRT video signal and framing to that (PAL and\or NTSC capable). So, as card goes now you have something that can DVI or use S-Video but needs a PAL\NTSC convertor to hook to a normal TV.
Dazzle media hubs can accomplish that (DVI to older style PAL or NTSC TV), but unless you have the big IC and another signal pulse generator module for the long empty vertical place of the right specs you will not get PAL\NTSC TV out of card itself.
Voltage level conversion alone will not do that as the framing signal structures as well as rates are different.
Comments
http://www.vr-zone.com/guides/NVIDIA/MX440VMod/
This WAS done on an nVidia reference board.
DC/DC converter is IRU3033 from International Rectifier that integrates dual channel DC/DC converter. First channel (with inductor) is for GPU Core Voltage. The second one for DDR Memory. Memory voltage is probed from Vfb2.
R612,Ohm Memory voltage,V Approximately Maximum Frequency, MHz
180 2.50 450
150 2.75 500
130 2.98 550
GPU core voltage is probed from Vfb1.Default GPU core voltage is 1.50V. The voltage division resistors is on the front side of PCB and soldering there is not the easy way, so for GPU core I decided to add potentiometer in parallel with Rb. Here is table for GPU voltage. Rx is total resistance of Rfb1b in parallel with our potentiometer (5Kohm piher). I am running my MX440 with GPU at 350Mhz (1.85V) and Memory at 550Mhz (2.98V). I'm sure that this is still safe and very stable setting with a little better cooling.
edit: im running 420core and 650mem defalt voltage
i cant find the DC/DC converter is IRU3033.
www.helm.com.tw/product/ir/paper/source/IRU3033.pdf
Source, try JameCo, or here:
http://ec.irf.com/v6/en/US/adirect/ir?cmd=catSearchFrame&domSendTo=byID&domProductQueryName=IRU3033
Or look on a Pentium, Pentium II, or Pentium III board-- it is a 5V to 3.3 V rectifier on an SOIC DIP 2X4 leg pattern. But International Rectifier WILL sell you just one direct if you want.
John Danielson.
None of the Gainwards match perfect either, but the UPC mfr traces to Gainward's anonymous OEM or previous name of CardExpert Technology. And those with that blank and look are the ones with that Ok sticker size and color-- which are 8X already.
DEFINITELY need to see the whole card you have.
Confused, but looks like you have an 8X card now which has had parts stripped off of it.
my card is the pro/600-8x with TV-OUT/DVI
Your card has a major IC and a timing-crystal-like long signal rate sync module missing as opposed to the retail Gainwards I could find-- I crawled their whole site. I suspect they have the wrong pics up on the web for some cards-- in fact am sure of it, as what they showed on their corporate site for what you actually have is a pic for something not at all like your card layout.
So, do you want to have a better card with a mod??? Actually, the part under the fan is coremost chip. The chip missing is typically missing on video cards with slower RAM or a PAL\NTSC TV Out signal convertor not present.
So, I think you have an 8x and you know so, so what do you want to do??? what is the end goal of the mod you want to make???
The big square IC converts either DVI to PAL\NTSC or one of the latter or straight CRT video signal and framing to that (PAL and\or NTSC capable). So, as card goes now you have something that can DVI or use S-Video but needs a PAL\NTSC convertor to hook to a normal TV.
Dazzle media hubs can accomplish that (DVI to older style PAL or NTSC TV), but unless you have the big IC and another signal pulse generator module for the long empty vertical place of the right specs you will not get PAL\NTSC TV out of card itself.
Voltage level conversion alone will not do that as the framing signal structures as well as rates are different.
John Danielson.