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Asus P5Q3 Deluxe/WiFi-AP @n and 2 pairs of TW3X4G1333C9DHX - BIOS settings


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I searched the forum for these settings and found one fairly similar, the only difference is that i have 8 gb and the other one 4 gb


Can anybody telle what my BIOS settings should be?


Thanks a lot

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The only memory Corsair supports in a four DRAM slot population is their Quad kits. This does not mean two dual kits or even worse two dual kits of different versions will not work together, just that you have no recourse to RMA Corsair if they do not work together. If there are problems with the DRAM modules, they are still supported via lifetime warranty, but that is for physical defects and errors in a two stick kit mode. Matched Quad sets are highly binned modules for a four slot population. The Dual sets are tested as a kit, not a Quad and warranted as a dual kit, not a Quad setup. You need to Memtest them as Kits (2 modules, not as a four DRAM slot population). If they fail as a kit or singly, then you have RMA. Keep in mind that there is no support for mixing and matching different versions of DRAM either since different version are of different fabrications and/or manufacturers. They might work, they might not work, but you have no support if they do not work. Thus you are advised to buy all the DRAM at the same time and in this way be more assured of getting the same versions. If you buy online, be sure to specify same versions of the modules.


You are advised to drop the bandwidth to 1066Mhz and raise the NB Voltage +.15v.


Please research this thread:




There is a limitation of the On Motherboard (Intel) memory controller or On CPU (AMD) and a population of all four banks at the full speed of a two bank run. This limitation is across the board with both AMD and Intel chipset based boards, DDR, DDR2 and DDR3.


Keep in mind that often issues can arise in the longer term even though you have shorter term stability. The issues seldom damage the DRAM unless you raise the DRAM voltage too high. They damage the on CPU (AMD) memory controller which has a harder time keeping up with the demands of a four DRAM slot population being run as fast as a two DRAM slot population.


You are advised to drop the memory speed from 1333Mhz to 1066Mhz and increase your memory controller voltage +.1v for your X38/X48 memory controller chipset.

Download Memtest86+ V2.11 from--->

Download CPU-z from

Restart the system and enter your BIOS. Load Setup Defaults. Save Setup Defaults. Then set to these values:


AI Overclock Tweaker

Configure Advanced CPU Settings

CPU Ratio Setting = 7.5
C1E Support = Enabled

Configure System Performance Settings

Ai OVerclocking Tuner = Manual
CPU Ratio Setting = 7
FSB Frequency = 333
PCIE Frequency = 100
FSB Strap to North Bridge = 333
DRAM Frequency =  DDR3-1066MHz
Dram CLK Skew on Channel A1 = Auto
Dram CLK Skew on Channel A2 = Auto
Dram CLK Skew on Channel B1 = Auto
Dram CLK Skew on Channel B2 = Auto
Dram TIming COntrol =   Manual 

Primary Information

CAS# Latency = 9 DRAM Clocks
DRAM RAS# to CAS #Delay = 9 DRAM Clocks
DRAM RAS# Precharge =  9 DRAM Clocks
DRAM RAS# Activate to Precharge = 24 DRAM Clocks
RAS# to RAS# Delay = Auto
Row Refresh Cycle Time = 60 DRAM Clocks
Write Recovery Time = Auto
Read to Precharge Time = Auto

Secondary Information

Read to Write Delay (S/D) = Auto
Write to Read Delay (S) =  Auto
Write to Read Delay (D) = Auto
Read to Read Delay (S) = Auto
Read to Read Delay (D) = Auto
Write to Write Delay (S) = Auto
Write to Write Delay (D) = Auto

Third Information

WRITE to PRE delay = Auto
READ to PRE delay = Auto
PRE to PRE delay = Auto
ALL PRE to ACT delay = Auto
ALL PRE to RED Delay = Auto
DRAM Static Read Control =  Disabled
DRAM Dynamic Write Control =  Disabled
DRAM Read Training =  Disabled
DRAM Write Training =  Disabled
MEM. OC Charger  = Enabled
Ai Clock Twister=  Auto
Ai Transaction Booster= Auto


CPU Voltage = Auto
CPU GTL Voltage Reference(0/2) = Auto
CPU GTL Voltage Reference(1/3) = Auto
CPU PLL Voltage = Auto
FSB Termination Voltage = Autov
DRAM Voltage = 1.8v
NB Voltage = 1.25v
NB GTL Reference = Auto
SB Voltage = Auto
PCIE SATA Voltage = Auto
Load-Line Calibration = Auto
CPU Clock Skew = Auto
NB Clock Skew = Auto
CPU Margin Enhancement = Optimized

Boot to the Memtest CD. Allow for two full passes. Then, if stable, enter Windows and run CPU-z. Post screenshots of CPU-z's CPU, Memory and SPD tabs.

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