diff --git a/src/i810_reg.h b/src/i810_reg.h
diff --git a/src/i830_driver.c b/src/i830_driver.c
index 1041fe3..426b20f 100644
--- a/src/i830_driver.c
+++ b/src/i830_driver.c
@@ -1964,12 +1964,12 @@ SetHWOperatingState(ScrnInfoPtr pScrn)
     * FIFO RAM entries equally between planes A and B.
     */
    if (IS_I9XX(pI830)) {
-       if (IS_I915GM(pI830) || IS_I915G(pI830))
-          OUTREG(DSPARB, (95 << DSPARB_CSTART_SHIFT) |
-                 (48 << DSPARB_BSTART_SHIFT));
-       else
+       if (IS_I965GM(pI830) || IS_IGD_GM(pI830))
           OUTREG(DSPARB, (127 << DSPARB_CSTART_SHIFT) |
                  (64 << DSPARB_BSTART_SHIFT));
+       else
+          OUTREG(DSPARB, (95 << DSPARB_CSTART_SHIFT) |
+                 (48 << DSPARB_BSTART_SHIFT));
    } else {
        OUTREG(DSPARB, 254 << DSPARB_BEND_SHIFT | 128 << DSPARB_AEND_SHIFT);
    }