Sul sito della msi c' scritto questo:
One AGP (Accelerated Graphics Port) 4x (1.5V only)

NOTE : The AGP slot DOES NOT support 3.3V AGP 2x card. Use of 3.3V AGP 2x card may cause damages to the mainboard. To identify the spec of your AGP card, refer to the documentation supplied with the AGP card or check the view of its contact pins (golden fingers) before you install it.
Ci puo andare una fx5900xt?