Index: sys/dev/amdtemp/amdtemp.c
===================================================================
--- sys/dev/amdtemp/amdtemp.c
+++ sys/dev/amdtemp/amdtemp.c
@@ -132,6 +132,12 @@
  */
 #define	AMDTEMP_CPUID		0xfc
 
+/*
+ * AMD Family 17h range select mask
+ */
+#define	AMDTEMP_17H_RANGE_SEL	(1 << 19)
+#define	AMDTEMP_17H_OFFSET_VAL	490
+
 /*
  * Device methods.
  */
@@ -591,14 +597,16 @@
 amdtemp_gettemp17h(device_t dev, amdsensor_t sensor)
 {
 	struct amdtemp_softc *sc = device_get_softc(dev);
-	uint32_t temp;
+	uint32_t temp, val;
 	int error;
 
-	error = amdsmn_read(sc->sc_smn, AMDTEMP_17H_CUR_TMP, &temp);
+	error = amdsmn_read(sc->sc_smn, AMDTEMP_17H_CUR_TMP, &val);
 	KASSERT(error == 0, ("amdsmn_read"));
 
-	temp = ((temp >> 21) & 0x7ff) * 5 / 4;
+	temp = ((val >> 21) & 0x7ff) * 5 / 4;
 	temp += AMDTEMP_ZERO_C_TO_K + sc->sc_offset * 10;
+	if (val & AMDTEMP_17H_RANGE_SEL)
+		temp -= AMDTEMP_17H_OFFSET_VAL;
 
 	return (temp);
 }