diff --git a/vidix/nvidia_vid.c b/vidix/nvidia_vid.c
index 302d99dfc9..d87cfc807f 100644
--- a/vidix/nvidia_vid.c
+++ b/vidix/nvidia_vid.c
@@ -673,12 +673,15 @@ static void nv_getscreenproperties(struct rivatv_info *info){
   /* and the 10th in CRTC_OVERFLOW*/
   info->screen_y |=(VID_RD08(info->chip.PCIO,0x03D5) &0x40)<<3;
   ++info->screen_y;
+
+  if(info->chip.arch >= NV_ARCH_10){
   /* NV_PCRTC_EXTRA_VERT_DISPLAY_END_10 */
   VID_WR08(info->chip.PCIO,0x03D4,0x25);
   info->screen_y |= (VID_RD08(info->chip.PCIO,0x03D5) &0x02)<<9;
   /* NV_PCRTC_???_VERT_DISPLAY_END_11 */
   VID_WR08(info->chip.PCIO,0x03D4,0x41);
   info->screen_y |= (VID_RD08(info->chip.PCIO,0x03D5) &0x04)<<9;
+  }
 
   /* NV_PCRTC_OFFSET */
   VID_WR08 (info->chip.PCIO, 0x3D4, 0x13);