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DDR3 1800 only reads as DDR3 1333


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Hi Ram Guy,


I have just completed assembling my new computer and my memory is

Corsair 1Gx2 TWIN3X2048-1800C7DF R

but only reads as DDR3 1333.

This is confirmed by Memtest.


My processor is Intel E8500, MB is Gygabyte GA-X48T-DQ6 775 X48 RT


I have not changed anything in the bios.

Everything is default.


How can I speed up my memory to 1800 or is this a defective part?



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You must perform an overclock of the CPU FSB from 333Mhz - 450Mhz to reach the 1600Mhz of the DRAM. Drop your multiplier from 9.5 to 7. It is set to 9.5 X 333 default (9.5 X 333 ~= 3.16GHz. Set to 7 X 450 ~= 3.15Ghz and the DRAM to 1800Mhz.

Download Memtest86+ V2.01 from--->

Download CPU-z from

Enter your BIOS. On the main BIOS screen press Ctrl + F1. You will see the screen flicker. Next select the MB Intelligent Tweaker option. On that screen you will see many additional settings that were not there before.


MIB Intelligent Tweaker (M.I.T.)
CPU Clock Ratio = 7
CPU Host Clock Control = Manual
CPU Host Frequency = 450Mhz
PCI Express Frequency = 100Mhz
C.I.A.2 = Disabled
Performance Enhance = Auto/Normal
System Memory Multiplier = 4
DRAM Timing Selectable = Manual
CAS Latency Time = 7
DRAM RAS# to CAS# Delay = 7
RAS# Precharge = 7
Precharge Delay (tRAS) = 20
ACT to ACT delay = Auto
Bank Write To READ Delay = Auto
Refresh to ACT Delay = 0
Read to Precharge Delay = Auto
Memory Performance Enhance = Normal
Dimm OverVoltage Control = +.4V
PCI-e OverVoltage Control = Normal
(G)MCH OverVoltage Control = +.3
CPU Voltage Control = Auto
Robust Graphics Booster = Auto


Run Memtest for two full passes, then (If Stable), enter Windows and post screenshots of CPU-z's CPU, Memory and SPD tabs.

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