Increase the maximum diff between hfa dies to 100Mhz.
diff --git a/driver-hashfast.h b/driver-hashfast.h
index f274503..e19a990 100644
--- a/driver-hashfast.h
+++ b/driver-hashfast.h
@@ -31,7 +31,7 @@ char *set_hfa_fan(char *arg);
#define HASHFAST_MINER_THREADS 1
#define HFA_CLOCK_DEFAULT 550
#define HFA_CLOCK_MIN 125
-#define HFA_CLOCK_MAXDIFF 50
+#define HFA_CLOCK_MAXDIFF 100
#define HFA_TEMP_OVERHEAT 95
#define HFA_TEMP_TARGET 88
#define HFA_TEMP_HYSTERESIS 3