Cards like this nedd two thing if i recall to trun them into a gf card. A driver hack and a hard mod. If i recall the mods were mostly the same across model lines.
But id just used it as a qutro card.

My advice is to give the card a try as it is before trying to hard or soft mod the card, generally the issues and myths about playing on Quadros are over hyped though there was a time where performance in games was clearly slower but the FX3000 is still a solid card from this time when keeping in mind the weaknesses of the generation. I would consider tinkering around with riva tuner and go from there before taking any chances that could brick the card. This stuff doesn't rain from the sky or grow on trees like it was in the good old days.

Run it as is, it really doesn't make a difference. I have a pretty big Nvidia agp collection including fx5800, fx5900ultra and fx5950ultra but also the Quadro fx1000, fx2000 and your fx3000.

Some time ago i compared them and the same cards at the same speeds (like fx5800 400/400 vs Quadro fx1000 overclocked @ 400/400 clocks ) perform about the same in 3dmark and such.

Just give it a try.
I have a QuadroFX3700 and it was fast enough to test Grid and Fallout 3. Seemed as fast as a 9600GT in lower resolutions.