diff --git a/CHANGES b/CHANGES
index 5939e76..5449d1f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -26,6 +26,7 @@ SVN HEAD
                 Decode more DDR3 module types
                 Fix DDR3 tRAS decoding
                 Fix DDR3 core timings rounding
+                Round down PC3 numbers to comply with Jedec
   i2cdetect: Do a best effort detection if functionality is missing
              Clarify the SMBus commands used for probing by default
   i2c-dev.h: Minimize differences with kernel flavor
diff --git a/eeprom/decode-dimms b/eeprom/decode-dimms
index 7473b3a..3ac3694 100755
--- a/eeprom/decode-dimms
+++ b/eeprom/decode-dimms
@@ -1362,6 +1362,8 @@ sub decode_ddr3_sdram($)
 	my $ddrclk = 2 * (1000 / $ctime);
 	my $tbits = 1 << (($bytes->[8] & 7) + 3);
 	my $pcclk = int ($ddrclk * $tbits / 8);
+	# Round down to comply with Jedec
+	$pcclk = $pcclk - ($pcclk % 100);
 	$ddrclk = int ($ddrclk);
 	printl("Maximum module speed", "$ddrclk MHz (PC3-${pcclk})");