Old motherboard ddr2 problems with 5700

Hi guys,

I have an old server motherboard, ddr2 with 4 gb ram. Why all the 580, 5500xt and 5600xt work without problems but all the 5700 don’t work?
i cannont see the defference between 5600 and 5700…
Is it too old the motherboard only for the 5700?