diff --git a/src/machine/m_at_slot1.c b/src/machine/m_at_slot1.c
index 0c4be2249..630231046 100644
--- a/src/machine/m_at_slot1.c
+++ b/src/machine/m_at_slot1.c
@@ -1057,8 +1057,8 @@ machine_at_p6sba_init(const machine_t *model)
     device_add_params(&w83977_device, (void *) (W83977TF | W83977_AMI | W83977_NO_NVR));
     device_add(&intel_flash_bxt_device);
     spd_register(SPD_TYPE_SDRAM, 0x7, 256);
-    device_add(&w83781d_device);    /* fans: CPU1, CPU2, Thermal Control; temperatures: unused, CPU1, CPU2 */
-    hwm_values.voltages[1] = 3300; /* Seems to be the I/O voltage, reported as "CPUi/o" in the Leadtek BIOS and "CPU2" in the SuperMicro BIOS */
+    device_add(&w83781d_device);   /* fans: CPU1, CPU2, Thermal Control; temperatures: unused, CPU1, CPU2 */
+    hwm_values.voltages[1] = 1500; /* potentially Vtt; Leadtek BIOS calls it CPUi/o; Supermicro BIOS calls it CPU2 and reads a voltage this low as N/A */
 
     return ret;
 }