Same problem, out of range:

It seems like a rogue card. Anyway, I appreciate the effort; it's a complex calculation that I'm even struggling to understand.

ask chatgpt for help, provide current values,
he will calculate new.

working for me

avenger_ wrote on 2022-11-07, 10:51:

Thanks, that was very helpful!

I cooked something a bit louder ^^

https://i.imgur.com/GQ0801s.jpg

I did some adjustements for my Dustbuster replica 😉

Although not a AGP card, the same BIOS + strap mod works either way apparently, at least for the G92 Quadro FX3700. I have one that I managed to convert to a 8800GT, and a 8800GT that I got to run as a QFX3700.

slivercr wrote on 2018-03-21, 16:10:

Rare and all, I did a voltage mod on this one: stock DDR voltage for this card was 2.3V, as far as I can tell from looking online and looking at a datasheet for "similar" Samsung chips, they should run at 2.5V. I brought them up to 2.48V, which gave me some stability when clocking them beyond 400 MHz. Easy soldering to some test points that were nearby, easily reversible too.

Nice mod. I would like to do it because it is clean and reversible.

Are there any VRAM voltage measure points on the card? How does this mod actually works? I mean how resistance corresponds to voltage?

I don't have 8,2k ohm resistor atm, the 10k is the closest one. Tried it (without soldering yet) and now I'm able to reach around 950 MHz with Ultra timings. So close to 1GHz...

Also, I'm able to reach 500MHz on 1.5V with a dusbuster-like cooler. Are these two missing capacitors on FX1000 related to core or VRAM stability? Are they really needed?

OK, I think I've figured it out. Below is the coil where the voltage rose from 2.3V to 2.5V after I added an 8.2 kΩ resistor. With a 10 kΩ resistor, it was 2.47V. The resistor fit so tightly that I decided not to solder it in, but just secure it with a glue gun—so the mod is fully reversible.

So far, I’ve managed to reach 475 MHz/950 MHz at 1.5 V vcore and 2.5 V vmem. 500/1000 seems out of reach.