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TW3X4G1600C9DHX G on Gigabyte GA-MA770T-UD3P


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After an initial hassle with instability due to undervolting (default voltage was 1.6, and was unstable until I raised it to 1.8), I have another problem. Nothing - not Memtest, not Vista 32-bit, not Ubuntu - detects that I have 4GB of RAM. Only 2GB is detected, and I can't figure out why. When I take out one 2GB stick, only 1GB is detected. It's exactly as if each of my sticks of RAM is 1GB instead of the 2GB it is supposed to be. CPU-Z reports that I have 2 sticks of 1GB RAM each.


With regard to settings, I have tried to adjust the timings to 9-9-9-24 the way they are supposed to be (but I am not sure if I have done it properly), and this didn't change things. I am running the RAM at 1333 instead of 1600, because 1600 was not stable.


I am not sure what to do. Perhaps it has something to do with dual channel/triple channel? I can't find where to deal with that in my BIOS... CPU-Z says the RAM is dual channel.


Memtest shows no errors. However, it too reports 2047MB RAM, and the settings it lists are odd: "519MhZ (DDR1038) / cas: 2.5-1-7-5 / DDR1"


My CPU is a Phenom II X2 550 Black Edition, and graphics is a Sapphire Radeon HD4850. Nothing else except a 200gb SATA1, Anteq Basiq 500W PSU and an IDE DVD-ROM drive. With the exception of the HD, DVD, and PSU, the system is completely new.


Any help would be appreciated.

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I would be happy to, but I want to remind you that they both do work individually, just at half capacity... this makes me think that the sticks are ok but something in the bios is cutting their capacity in half.


Also, the XMS3 DHX RAM is not explicitly compatible with the GA-MA770T-UD3P motherboard, according to the Gigabyte website.


If I do decide to return them, I should go through the local vendor I bought it from, not Corsair directly, right?



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  • Corsair Employee
These are 1.0 Gig modules not 2.0 Gig modules so either they were swapped at the reseller or just miss packaged, I would suggest contacting the reseller if they charged you for a 4 Gig set and see if they will swap them.
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