I have a Medion Composer 5100, 3Ghz and the FX5300 card.
I have upgraded the ROM to PC3200, ya can go even better up to 800Mhz,
and I have added a fanless cooler to the 5300, which BTW is really a PCX5300.
running Win XP Pro SP2, ZA Security Suite, GhostSurf, AVG, and a few others.
BTW, added a filter to the outside, side case of the puter were the CPU fan ducting is located, keeps the cpu cleaner.