Appears updating the BIOS fixes the issue.

After searching through the DFI Beta site, a BIOS was found that completely resolved the problem with the incompatibility between the motherboard and the HD4870 X2.

Below we have listed the motherboards which may be affected by this problem as well as links to their corresponding Beta BIOS pages. You should use the most recent BIOS file we indicate or the latest one available.

LANPARTY DK X38-T2R: X38D725

LANPARTY DK X38-T2RB: X38D7251

LANPARTY DK X48-T2RS: X48DD725

LANPARTY LT X38-T2R: X38AD725

LANPARTY LT X48-T2R: X48AD725

LANPARTY LT X48-T3RS: X48GD725

LANPARTY UT X48-T2R: X48CD725

LANPARTY UT X48-T3RS: X48BD725