diff --git a/litedram/modules.py b/litedram/modules.py
index 5edf56c..b8bde9d 100644
--- a/litedram/modules.py
+++ b/litedram/modules.py
@@ -551,7 +551,7 @@ class MT40A256M16(SDRAMModule):
     ncols       = 1024
     # timings
     trefi = {"1x": 64e6/8192, "2x": (64e6/8192)/2, "4x": (64e6/8192)/4}
-    trfc = {"1x": (None, 260), "2x": (None, 160), "4x": (None, 110)}
+    trfc  = {"1x": (None, 260), "2x": (None, 160), "4x": (None, 110)}
     technology_timings = _TechnologyTimings(tREFI=trefi, tWTR=(4, 7.5), tCCD=(4, None), tRRD=(4, 4.9), tZQCS=(128, 80))
     speedgrade_timings = {
         "2400": _SpeedgradeTimings(tRP=13.32, tRCD=13.32, tWR=15, tRFC=trfc, tFAW=(28, 35), tRAS=32),
@@ -559,6 +559,25 @@ class MT40A256M16(SDRAMModule):
     speedgrade_timings["default"] = speedgrade_timings["2400"]
 
 
+class MT40A512M8(SDRAMModule):
+    memtype = "DDR4"
+    # geometry
+    ngroupbanks = 4
+    ngroups     = 4
+    nbanks      = ngroups * ngroupbanks
+    nrows       = 32768
+    ncols       = 1024
+    # timings
+    trefi = {"1x": 64e6/8192,   "2x": (64e6/8192)/2, "4x": (64e6/8192)/4}
+    trfc  = {"1x": (None, 350), "2x": (None, 260),   "4x": (None, 160)}
+    technology_timings = _TechnologyTimings(tREFI=trefi, tWTR=(4, 7.5), tCCD=(4, None), tRRD=(4, 4.9), tZQCS=(128, 80))
+    speedgrade_timings = {
+        "2400": _SpeedgradeTimings(tRP=13.32, tRCD=13.32, tWR=15, tRFC=trfc, tFAW=(20, 25), tRAS=32),
+        "2666": _SpeedgradeTimings(tRP=13.50, tRCD=13.50, tWR=15, tRFC=trfc, tFAW=(20, 21), tRAS=32),
+    }
+    speedgrade_timings["default"] = speedgrade_timings["2400"]
+
+
 class MT40A512M16(SDRAMModule):
     memtype = "DDR4"
     # geometry