@Keropi
As per your advice, the only way I could make my Goldengate run stable was to use it in the top slot of the A4000D motherboard. I did try it in my A4000T but without any luck. I didn't spend a lot of time on it though. You might have better luck but be prepared to try different slots and spend a lot of time messing with it.
My advice would be that if yours is working in the Top SLot of an A4000D leave it alone and buy another Bridgeboard for the A4000T. Perhaps an old A2386SX with a clip on 486 chip.
Good Luck,
-Jeff