I'm so very confused, please help me (my 9800 vmod issue)

[Arkangyl]

Ok, so I followed the guide to the letter, had my VR's @ 10k ohm's

http://www.fastlanehw.com/reviews.php?i=74&page=2

that guide, calls for 2 10k ohm .75w VR's; rRadioshack only had 1.25's and several folks here told me they're fin.

My soldering looks good and all; and before I solder anything my VR's are 10k ohm; after soldering they're 10k ohm. It's late so I figure I test tomorrow (today) and go to sleep.

Come tonight; I decide to check my resistances before turning on aaaand... 226 ohms? WTF??? thats from the VR's legs...

So, I dont wanna fry the sucka so I tear them off (carefully) and check again; 10k ohm...

So, I'm confused and incoherent (if you made it this far thank you).

If someone could tell me; why does it say 10k ohm when the VR isnt soldered to my 9800 but when it is I'm told 226 ohm's? I tried changing the resistance but it was 225 and down when soldered on...

No big loss; I'm typing this with my 9800 np/pro/xt as my GPU and its a-ok...

thanks

[Hell-Fire]

Ok, before you solder the VR into the circuit of the video card, it has its own "total resistance" of 10K ohms.

Now, when you solder it to the video card, you are now adding its resistance to the resistance that is onboard the card. Honestly you are adding the 10K VR in parallel to the onboard resistance, which actually lowers the overall resistance.

Dont worry, as long as the VRs are set to max resistance before soldering to the card, all will be well after you fire the card up.

Rule of thumb is that on 99% of mods done, the VR is being soldered into an onboard circuit and that effectively puts that VR in parallel with the resistance that is already present on the card. The new total resistance will ALWAYS be less than the smaller of the 2 values. Meaning, that if you add a 10K VR to a circuit that only has 250 ohms of resistance, then after soldering the VR down if you check the resistance at the VRs legs, it will now read less than 250 ohms.

Hope that helps, and let us know if you have further questions.

[Arkangyl]

damn.... well, like I said I took the mods off to make sure the card still worked; as curious as I am I think I'll let the poor thing be so I dont kill it as I want to re-sell it since my 6800 Ultra has replaced it...

[Hell-Fire]

Thats prob the best thing to do.

I do have this to say tho...just in case you are thinking about selling it here. You are more likely to get a little extra cash from a modded card than a stock card.

Reason being is that most members cant solder real well so modding a card is out for them...so they try to buy modded hardware.

Just my :2cents:.

[Arkangyl]

yea, I know. my soldering looked great (little long on the VGPU wire but hell, first time) and all the on-PCB soldering was AFTER I burned my finger with the iron :p

still; might have another go at it; really just dont want to re-mound the waterblock again (I know, lazy) to truely see what she'll do....