yes, but it'll be cheaper to replace the mobo, chip, and ram than upgr the 939 (unless u r luckier then me at finding a 939 cheap)...
i am in the same boat with a couple 3800's... i stuck a vendetta2 on one and got it to go 200mhz higher (2.8) but my other won't go past 2.5... it's just not worth it to upgr the chip, since a fry's $120 intel combo will spank any 939 rig...