Are you are about compatibility issues between AN7 and GF FX 5600?

Hi,
Bought an AN7, a boxed 2500+ Barton and CMX256A-3200C2PT (2 modules in
one pack, TwinX).
My goal was to overclock the barton to 3200+ simply by putting FSB to
200Mhz, i've been told that this works flawless.
Anyway, when i first ran my new system and get straight to the setup
window to set FSB to 200Mhz, no POST... returned to 166Mhz and
installed XP Home. I was running the memory at 166 too (333 DDR).
Tried 2 more times OC'ing to 200Mhz FSB on the first day, no go.

A part of it, had no problems for 2 days... the system was running
smoothly.

The problem is that 2 days after, i started getting BSODs every 5 or
10 minutes... haven't messed anymore with BIOS setup after day one.

After many hardware changes, i've discovered that the problem *seems*
related with my GForce FX 5600. Since when i took it out and put a GF2
GTS in place the system is running fine. And the FX also runs fine on
my older system, a P4 1.6 with an ASUS P4-TE MoBo.

Thanks in advance and please forget my bad english, i'm from Brazil.

BTW:
2500+ XP Barton
Abit AN7 Rev. 1.0 (Bios version was 13, when i started getting BSODs i
changed it to 15, the latest)
2X CMX256A-3200C2PT (2.5-3-3-6 @ 333Mhz)
MSI GeForce FX 5600 VTDR 128MB
Maxtor 80Gb ATA 133