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Gigabyte EP45-DS4P + TWIN2X2048-8500C5D


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Hi All,


Just a thread as I need some help

I am having quite a lot of trouble getting my system to work with 4GB Corsair

The place I purchased items off has not really been any help at all


I am having some trouble when installing it


I looked at the specs on the RAM itself – which is as follows

1st lot of Corsair Dominator (2x1GB) DDR2 1066MHZ RAM – 2.20V Version 4.1

2nd lot of Corsair Dominator (2x1GB) DDR2 1066MHZ RAM – 2.10V Version 1.2


For some reason when putting all this RAM into the Mainboard (Gigabyte EP45-DS4P)

The computer will not boot at all – no display / nothing happens - not even POST

I have tried all different combinations (even just having 3GB with no luck)

My computer works fine with either 2GB setup inside DDR2 RAM inside (on single and dual channel)

However I just cannot see how it is not working with all 4GB

Is it to do with the different voltage on the RAM? Or different versions?


I have updated BIOS to latest version F8 on Gigabyte's website

I have updated all Chipset / Sound other drivers for Mainboard also


I also checked on the Gigabyte website for the compatiable RAM combinations and this Corsiar was ticked that part of the reason I got this RAM. I originally had just 2GB but wanted to upgrade to 4GB due to hungry games with RAM. Plus the Mainboard states it supports up to 16GB


If anyone can give some advise / pointers would much appreciate it

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  • Corsair Employees
With 4 modules I would suggest setting the memory frequency at DDR667 and set the memory Voltage to 2.1 Volts and set the NB/MCH/SPP Voltage to +.2 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.
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Thanks for the prompt response

I will give that I try today


Why did I buy 1066 if I have to set the memory frequency to DDR667?


Should I scrap these 4 sticks of 1GB ram and get 2 x 2GB ones?

Will I be able to run at full 1066MHZ Dual Channel then?


Please advise

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Still waiting on response from RAM GUY


For following statement -

Why did I buy 1066 if I have to set the memory frequency to DDR667?


I am having dramas in settings

I am unsure where to look for the following statement


"set the NB/MCH/SPP Voltage to +.2 Volts"

I have found how to up the Voltage however this part I have no idea



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OK, let's get some understanding of hardware limitations and what can be done. When you populate all four DRAM slots it is advised to drop the bandwidth.


Please research this thread:




There is a limitation of the On Motherboard memory controller and a population of all four banks, when running at the full speed of a two bank run. This issue is across the board with both Nvidia and Intel chipset based boards, DDR, DDR2 and DDR3.


Keep in mind that often issues arise in the longer term. The issues seldom damage the DRAM. They damage the on motherboard 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. Those who want to be secure in their system either purchase a single kit of the DRAM capacity that the four singles have or they move to a higher bandwidth DRAM and drop the bandwidth. I also advise it as I have personally seen the issues that can and often do arise with a four DRAM slot population running at the full speed of a single kit speed.


If you research that thread well, you will see that there are two alternatives. One is to drop the bandwidth, raise the memory controller voltage. The other is to drop the bandwidth, raise the memory controller voltage, increase the CPU FSB (via overclock) and concurrently raise the DRAM speed to recoup some of the lost bandwidth.


Before we move on, you must understand this limitation and what can be done. Please post in this thread once you have studied that post and understand it.

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Thanks for your input


Believe it or not

I actually just finished reading this tread your reccomended


I am happy to drop my DRAM to 800mhz since I dont want to burn them out

or damage my mainboard


Can you please advise what steps I need to follow to set to 800MHZ?

I am fairly new to the game and know how to use the BIOS a little bit

I have the Gigabyte EP45-DS4P mainboard which I thought was a quality board when purchasing last month


I am willing to give it a shot and see if can get the different revisions to work together at the lower Memory setting - 800MHZ


I await your response when you have a spare minute or 2!

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Download Memtest86+ V2.01 from--->

Download CPU-z from--->

Shut the system down. Insert a single stick of Version 1.xx DRAM in Slot 1 (Closest to the CPU) and slot 3. Restart, 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. Load Setup Defaults. Save Setup Defaults and set to these values:

[b]MIB Intelligent Tweaker (M.I.T.)[/b]Robust Graphics Booster = Auto
CPU Clock Ratio = 9
Fine CPU Clock Ratio = +0.0

Clock Chip Control

CPU Host Clock Control = Enabled
CPU Host Frequency (Mhz) = 400Mhz
PCI Express Frequency = 100Mhz
C.I.A.2 = Disabled

DRAM Performance Control

Performance Enhance = Standard
System Memory Multiplier = 2.3
Hi Speed DRAM DLL Settings = Option 2
DRAM Timing Selectable = Manual
CAS Latency Time = 5
DRAM RAS# to CAS# Delay = 5
RAS# Precharge = 5
Precharge Delay (tRAS) = 15
ACT to ACT delay = Auto
Bank Write To READ Delay = Auto
Refresh to ACT Delay = 0
Read to Precharge Delay = Auto

System Voltage Control

DDR2 OverVoltage Control = +.3V
PCI-e OverVoltage Control = Normal
(G)MCH OverVoltage Control = +.03
CPU Voltage Control = Auto

Boot to the Memtest ISO. Allow for two full passes. Shut the system down. Insert a stick of Version 4.1 into slot 2 and the final stick in slot 4. Restart, boot to the memtest CD and allow for two full passes. If stable, enter Windows and post a screenshot of CPU-z's CPU, Memory and SPD tabs.

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  • 5 months later...

To All,


I call on you guys once again for your great advice


Now as you may know from my above posts I currently have 4 x 1GB Corsair RAM, which I have altered memory Voltage to get close to 1066Mhz


It has been running OK, however I have been wanting to get 2 x 2GB Ram sticks to replace this for a while


Now I have been offered some GEIL DDR2 4G PC2-8500 1066Mhz(2x2G) CAS 5


I was wondering whether this would be a downgrade or upgrade?


I would like to do the exercise however what would you advise to set the memory voltage at? Should I let the motherboard decided automatically since I am going back to 2 sticks instead of 4?


I would appreciate someone's help when they have time

Thanks all



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OK then sounds good


I have ordered a new set of 2 x 2GB (Twin2x4096-8500C5DF)


Upon arrival what will I need to set the BIOS settings back to?

Do I still need to have the RAM at higher voltage?


I would like to know in advance since they should hopefully be here tomorrow





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