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Not stable in dual channel...please help


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My system specs are listed in my sig.


I am unable to stably run dual channel mode with twinx1024-4400c25 in my dfi lanparty expert mobo. I have tried very relaxed timings at 2T to no effect. I am unable to run prime95 in dual channel mode, and the system is generally unstable.


I can pass memtest in dualchannel mode for over 70 passes of test 5, and 15 passes of everything with no errors.


If I use a single stick of ram in the orange slot furthest from my cpu I can run prime95 without any problems. Please tell me what I can do, or if you need more info to help me out. I can post screens of my dram settings from the BIOS if wanted.



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I have everything set VERY loose in the hopes of getting dual channel working correctly and then optimizing later, but I had no luck doing that....










I have also tried the settings listed here: http://www.dfi-street.com/forum/showpost.php?p=242863&postcount=4 with no luck either.....

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All my ram settings are shown in the bios screens that I posted links to. I currently have them set very loose in an attempt to get dual channel at least working correctly and then tweak it later. The system is not overclocked as of yet


My settings in the genie bios are:


htt: 200mhz

ldt: x4

cpu multi: x10

cnq: disabled

Dram voltage: 2.80v

ram: 1:1

cpc: disabled

tcl: 2.5

trcd: 4

tras: 8


trc: 16

trfc: 19

trrd: 5

twr: 3

twtr: 2

trwt: 5

tref: auto

twcl: 1

bank interleave: disabled

dqs skew control; decrease skew

dqs skew value: 50

dram drive strength: 7

dram data drive strength: level 2

max async latency: 8

dram response time: normal

read preamble: 7

idleCycle limit: 256 cycles

dynamic counter: disable

r/w queue bypass: 8x

bypass max: 7x

32 byte granularity: enable (2 bursts)

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  • Corsair Employees

Please make sure that you have the latest bios and then load setup defaults and set the following settings and test the modules one at a time with http://www.memtest.org and let’s make sure one is not failing!

Dim Voltage 2.7 Volts

CAS Latency CL=2

Row Cycle Time tRC Bios Default

Row Refresh Cyc Time tRFC Bios Default

Ras# to CAS# delay tRCD 2

Row to Row delay Bios Default

Min Ras# Active Time tRAS 5

Row Precharge Time tRP 2

Write Recovery Time Bios Default

Write to Read delay Bios Default

Read to Write Delay Bios Default

Refresh Period tREF Bios Default

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what settings would you like me to use for memtest? (ie loop one test 50 times, or all test 20 times....etc etc., single sticks first, then dual channel?) 1t, 2t, or both?


Edit: why would you want me to run memtest at tighter timings than what is listed for the ram?

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  • Corsair Employees
DO NOT change any of the settings in memtest or you may get errors, just use the default tests for 2-3 passes And the modules you have will support these settings when running at DDR400 and would be a good way to make sure its not the system just will not over clock that well. So don’t over clock and leave the memory and CPU at 200 MHz with the settings I gave you and see if the system is stable.
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memtest passed in dual channel, I let it go for 10 full passes; about 4 hours. I'm now running dual instances of prime95 to make sure it all works in windows.


Once this is all going well at stock speeds I do plan to OC, should I leave everything as is in the BIOS with the exception of changing CAS to 2.5, tRCD to 4, tRAS to 8, and tRP to 4? Or does that go in a different section of the forum?


The last mobo, MSI K8N Neo2 Plat, I had these sticks in I was able to run them at 250 2.5-3-10-3 without a problem, should I expect similar results?

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I can't seem to get anything but 2-2-2-5. I've tried 220mhz at 2.5-3-3-10 and 2.79v and it blue screens on me before I get into windows. I have to right now use the memory dividers to get it to run near 200mhz at 2-2-2-5 timings, and I haven't been able to go much higher than about 210 at those timings.
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HTT is 290, cpu multi is x9, ram divider is 7:10. This puts the ram right at DDR400, which works just fine. I have successfully run dual instances of Prime95 at these settings for 9 hours until I manually stopped them.


If I try to get the ram much higher than 210 I have issues in Prime95. If I loosen up my timings to 2.5-3-3-10 when trying to go past 210 I get a blue screen before windows even loads.

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I still don't think it has anything to do with the bios, cpu, or the mobo as I've seen plenty of people with the same or very very similar setup able to achieve high ram speeds. I could almost certainly get much more out of this cpu if I wanted to take the time, but I had enough issues setting it up and getting the ram running in dual channel that I just wanted to get back to playing some games! If you happen to have any other suggestions on settings I could try, please let me know. Thanks!
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