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Gigabyte GA-MA790FXT-UD5P and 2 pairs of TW3X4G1333C9DHX


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Hi there,


I was hoping that someone could shed a little light on a major problem I'm having with my new build.


The computer freezes randomly when i use any more than 1 2Gb stick of memory yet will run ok on each individual stick....


Its totally stock - no OC'ing of anykind.


I'm tearing my hair out as i'm a n00b and i've sunk a lot of money into this.


Any help / suggestions would be greatly appreciated.



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  • Corsair Employees

Have you tested all of the modules one at a time with http://www.memtest.org to be sure one is not failing and do you have the latest BIOS> If so and all pass one up


With 4 modules I would suggest setting the memory frequency at DDR1066 and set the memory Voltage to 1.7-1.90 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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  • 5 months later...

I have exactly the same problem. Purchased a pair of said modules and my system keeps randomly freezing or restarting. System stability seems to improve when using just one module, but still it's not as stable as one would hope.


I have tested each and both modules with memtest86+ and after many runs no errors are reported. Same thing with Prime95. BIOS reports that voltages and frequencies are within specs. Unganged or ganged modes don't seem to have anything to do with the problem as well as other BIOS settings that involve the RAM. I flashed the motherboard's BIOS to the latest stable version - F7, but nothing changed. I also measured the ATX voltages and currents using a multimeter, and as far as the PSU goes, it's all OK.


Errors occur more often when performing memory-intensive tasks such as running Live CDs. When I was using both modules, I was unable to use sfdisk and parted to partition and format my hard drives. The system would hang, reboot or I would get all sorts of weird errors, such as sfdisk complaining about being denied access to a drive, even though I was logged in as root and no partition had been mounted.


At that point I suspected there might be something wrong with the hard drives, so I fiddled with the SB750 settings, switching between IDE and AHCI modes and used SeaTools Live CD from Seagate to test them, but neither the short nor the (excruciatingly) long tests found a problem. I did get a couple of "segmentation faults" though, that caused the program to exit, so I turned my attention back to the memory.


When I was searching for the parts to purchase for my rig, I got very frustrated, because most of the memory modules listed in Gigabyte's QVL can't be found here in Greece. Using the memory configurator on your web site I ended up purchasing the TW3X4G1333C9DHX kit thinking that since it is the first you list as being compatible with the MA790FXT-UDP5, you must have done some sort of test. Besides, it was not the first time I purchased Corsair memory based on your recommendations and never had a problem before.


I work as a freelance systems builder/tech support and sometime next week I am expecting a batch of several dual channel DDR3 kits (from several different manufacturers) for some clients, so I'll be able to try some of them out and report back if I discover anything of use.


In the meantime, do you have any suggestions?

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  • 1 month later...

I am using the same RAM and motherboard (bios F7 too) and I am facing the same issue as you. I have fortunately got my system running stable (total of 4 gbs in dimm slots 0 & 1) with the ram downclocked to 800 mhz @1.7 volts with all other RAM timings set to Auto. I have just finished a 12 hour run on prime95 without a single error.


I of course feel cheated that I must downclock to only 800 mhz when this RAM is supposed to run at 1333 MHZ. I am also awaiting a reply to another thread that I have started in regards to the same problem.


Greatly appreciate some help with tweaking the settings to be able to run at 1333 mhz!



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I might have the solution to the problem. If you are using the stock fan and thermal paste your cpu might be overheating at 1333 mhz.


My system ran perfectly stable at 800mhz during the 12 hour prime95 test. My CPU temperature was at 59C, the max operating temp of the phenom II 965 BE is 62 C.


I replaced my stock thermal paste with some coolermaster IceFusion and I was able to boot into Vista at 1066 mhz, whereas before I could not even complete the installation of Vista at any speed above 800 mhz. I even did a brief 10 minute run of prime95, and my CPU temp climbed to 61 C! So it definitely could be an overheating issue. I reduced my HT from 2000 mhz to 1800 mhz and my max temp at 1066 mhz was 59 C.


These temperatures are still too high. I don't think the stock AMD cooler is sufficient to run this ram at rated speeds. I am going to change it to something more robust.


Try it and let me know if this works for you

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