Please help - comp freezing after adding ram to MSI mobo

I have an MSI 785GM-E51 motherboard I've been using with a set of 2 x 1GB Patriot DDR3 Ram for the past 6 months completely stable. Here are the links to my motherboard and ram respectively:

I recently purchased a single 2 GB stick from Newegg to add to my current 2 GB for a total of 4GB.

When I added this stick to slot 3 I can boot into windows but it freezes immediately every time. I have tried putting the additional new stick in slot 4 as well...same problem.

I do not know how to manually change the voltages or timings in this motherboard's bios. I'm assuming I'll need to manually set these to make both work but I'm not sure how to do that in this bios if that's the problem.
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  1. I also thought it noteworthy to mention I did check that all 3 sticks of Ram (both of the 1GB sticks and the 2GB stick) are Patriot brand and all have a CAS latency of 9.

    Also here is my processor if it matters:
    AMD Phenom II X2 555
  2. I have seen too many issues with Patriot, I looked at both Certified & Tested - and the Patriot RAM is not listed for your MOBO.

    Patriot PSD32G1333K - not Certified ; not Tested {RMA the Patriot DDR}
    MSI 785GM-E51 {Certified DDR}

    Tested Kingston -

    The "real problem" & "solution" is not to mix-match DDR.
  3. On page 5/8 it shows the model number of Patriot so apparently they did check it...

    Also I made a mistake that I said Kingston earlier...all 3 sticks of ram are Patriot just 2 of them are 1GB (a pair I bought) and the 3rd is a single stick of 2GB
  4. ^ Check again -> search PSD32G1333K in the PDF.
  5. What I'm trying to say is that the PSD32G1333K is a Kit of 2x1GB sticks I've been using for 6 months+ with no issues what so ever...

    The new one I bought from new egg is a single 2gb stick with a model number PSD32G13332....the one on page 5. So the ones i've been using weren't tested by MSI but they've been working for a long time...until I added the 3rd stick that apparently was tested by MSI and is confirmed as working.

    I'm just confused how I could be running 2 sticks of 1gb but adding a 3rd one with larger density but same latency and timings causes my comp to freeze...
  6. Pull the {PSD32G1333K} and leave the {PSD32G13332}; obviously they don't "play" together well in the BIOS, and in reading {overlooked} you need to install your DDR in pairs.

    You "might" be able to Jerry Rig the BIOS by Individually setting the ALL CAS timings for each DDR stick.

    Unfortunately, I cannot find the full CAS speeds for both DDR {e.g. 9-X-X-X-X @1.5V}

    DIMM1 + DIMM2 = Dual Channel 1
    DIMM3 + DIMM4 = Dual Channel 2

    If it were "me" I would purchase another DDR that is on the Certified list.
  7. RMA'd the new 2gb stick, I'd rather run in dual channel mode with 2gb than 4gb in single. I did want to know, however, if I do purchase a 4gb kit (2x2gb) to add to my 2x1gb kit, would that be okay as a larger density as long as the new ones were identical and filled DIMM3 + DIMM4?
  8. Best answer
    First, make certain that each {set} pf DDR is installed in the channel {set}. The "size" is not a concern, but mixing+matching is often a problem. Even the same exact specs and same mfg can cause problems {e.g. 7-7-7-7-24-1T @ 1.5V}.

    Clearly, the most efficient way is a 1X Dual Channel vs 2X Dual Channel:
    2 | E | 2 | E | - most efficient
    2 | 1 | 2 | 1 | - less efficient

    Flip a coin and hope for the best.

    Example - Same Mfg/Same Specs/Different lot {see "JEEEZZ!!...} -

    Good Luck!
  9. Best answer selected by xyberelite.
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