Does anyone know what size screws I need to install the shroud on a 1GB Radeon HD6950 card? Pretty much all 1GB HD6950 models seem to have the same vapor champer petal heatsink fan shroud combo, with different cosmetic shrouds. So if anyone has one of these, and can tell me what screws I need for the shroud (M2.5x4? M4x4? etc.) I would be ETERNALLY grateful.