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Twin2x2048-6400C5DHX Issues


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I had recently bought Twin2x2048-6400C5DHX-G lot #10153549, to add more memory to my Gigabyte GA-EP45-UD3L motherboard.

Together with my first Twin2x2048-6400C5DHX-G lot #09427752 I would have 4 GB of memory.


The problem I'm having is, I can't use all four sticks, no matter what BIOS setting I use, both twin sets work fine by them self, even using three sticks works good.


Is there another solution to my dilemma ? :(:

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Sorry, that didn't work

Set the memory timings to 5-5-5-18-2T and the memory voltage to 1.9v. Set the memory frequency to 667MHz. You may also need to give the NB/MCH a slight voltage boost as well.

Gigabyte GA-EP45-UD3L v1.0, Bios F9

Reduce memory freq =667 -133Mhz

Increase memory Voltage=1.9 +.1

Increase MCH voltage=1.16 +.06

even increase tRFC=56 +4

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Twin2x2048-6400C5DHX-G lot #10153549, v5.1

Twin2x2048-6400C5DHX-G lot #09427752, v1.2


Maybe thats why these two won't work together?

Its too bad, I thought when I bought them they would do the job.


But when you buy ram, they don't tell you the version.

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the version does not matter, buying/installing 2 sets from 2 separate packages does.

yes you would have stood a better chance on getting the ram to play nicely together at a lower speed if they came from the same batch HOWEVER when 4 sticks are required as per your capacity needs, Corsair (and other) RAM makers design and test and package the 4 sticks together to be installed on 1 board. they were hand tested that way to ensure all 4 sticks will operate at their listed speed(s) on a single board.


there are 2 roads to take here, you can sell what you have and purchase a 4 stick kit from a single package or you can request 2 RMAs to have a better chance of getting 2 sets with the same version BUT this is not guaranteed either that you will get the same version back on both sets but your odds are likely better than 50/50 as per the posts i have read here over the past couple years.


i dont know if you have read this yet but it covers the dilemma you are facing a bit more than i can do in a post..




just yesterday i posted a similar response to the same issue here...


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GA-EP45-UD3L v1.0 F9 Bios





Which Driving Pull-up or Pull-down is best

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Well the (667) memory Ideal worked.

I had a old pair of Corsair Value RAM VS1GB667D2 5-5-5-15 combined with Twin2x-2048-6400DHX, and it works now I have 4GB dual channel memory.


Just need to test it now.........


Windows Experience Index went from 5.9 to 7.2 ... unsure why? memory running at 666 mhz


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  • 3 weeks later...

I went ahead and RMA the Corsair Twin2x2048-6400c5dhx v1.2, and a new set was returned.... cross my fingers and it worked


Now I have two pairs of Twin2x2048-6400C5DHX G, thats put me back in the game!


Thanks Corsair, and everyone who helped


Memory Controller:

Type Dual Channel (128-bit)

Active Mode Dual Channel (128-bit)


Memory Timings:

CAS Latency (CL) 5T

RAS To CAS Delay (tRCD) 5T

RAS Precharge (tRP) 5T

RAS Active Time (tRAS) 18T

Row Refresh Cycle Time (tRFC) 52T

Command Rate (CR) 2T

RAS To RAS Delay (tRRD) 3T

Write Recovery Time (tWR) 14T

Read To Read Delay (tRTR) Same Rank: 4T, Different Rank: 6T

Read To Write Delay (tRTW) 8T

Write To Read Delay (tWTR) Same Rank: 11T, Different Rank: 5T

Write To Write Delay (tWTW) Same Rank: 4T, Different Rank: 6T

Read To Precharge Delay (tRTP) 5T

Write To Precharge Delay (tWTP) 14T

Precharge To Precharge Delay (tPTP) 1T

Refresh Period (tREF) 3120T



MCH Read ODT 11T

Performance Level 7

Read Delay Phase Adjust Neutral

DIMM1 Clock Fine Delay 10T

DIMM2 Clock Fine Delay 5T

DIMM3 Clock Fine Delay 10T

DIMM4 Clock Fine Delay 6T


Memory Slots:

DRAM Slot #1 1 GB (DDR2-800 DDR2 SDRAM)

DRAM Slot #2 1 GB (DDR2-800 DDR2 SDRAM)

DRAM Slot #3 1 GB (DDR2-800 DDR2 SDRAM)

DRAM Slot #4 1 GB (DDR2-800 DDR2 SDRAM)

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