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F3-12800CL7D-8GBXM Mix or Match?

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  • F3-12800CL7D-8GBXM Mix or Match?

    I have F3-12800CLD-8GBXM already, and would like to add memory (I run large stats programs, some of the problems tend to run out of memory).

    I have an ASUS P8Z77-V
    Core I5 - 3570k @ 3.40
    (onboard GPU, that may change)

    The prices for memory sticks are all so close it makes me wonder. Options seem to be

    1. play it safe with another F3-12800CL7D-8GBXM maxing my 4 slots out at 16 (4x4G).

    2. use the closest matching 2x8 kit? This would seem to be the F3-1600C7D-16GTX, as both are CAS 7 @ 1.5v and have matching timings (7-8-8-24). That would take me to 24G total for only a couple of bucks more. And I'd only have to replace the 4G sticks with another set of 2x8's to max out at 32G.

    3. There are much faster and reasonably priced 2x8 kits available. Good lord, the F3-2400C10D-16GTX 2400 (PC#19200) are only a couple of bucks more. The idea would be to underclock the new kit back down to the F3-12800CL7D timings and voltages.
    I can't find any spec sheets that might tell me which (if any) have XMP settings that match the F3-12800CL7D XMP settings @1600 ie 7-8-8-24 at 1.5v.

    Is there such a spec sheet?

    Is there a kit with a better chance of underclocking to match?

    Is this a really bad idea? My P8Z77 has a lot of options, but I am a timid overclocker pretty much having limited myself to using XMP settings. But I'm willing to take a chance since the downside is winding up ebaying the 2x4 kit anyway...

    Appreciate any guidance.

  • #2
    Assuming you are fully aware that the end result may well be you selling the old kit.... any of them should be able tonrun at that speed, however if you buy a higher end kit and underclock it you will have to do that manually. Also note, that matching this 16gb set in the future isnt guaranteed to work. It likely can be done, but you cant count on it 100%. If you buy a faster kit, all you have to do is enter the timings from the slow kit into the new kit and you'll be done (if it works at all)
    ASUS P8Z77-V LK / I5 3350P / 2X F3-12800CL9D-8GBRL Running @ 1866mhz / MSI GTX760 TF

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    • #3
      Wow, thanks for the quick reply!
      Hmmm, about that 'if it works at all'. Any sense for the probability it will work? Are we talking a 90% chance or less than 50%?
      Any thoughts about which o the faster kit options has a better likelihood of successful underclocking and achieving CAS7 at 1.5v?

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      • #4
        Its all but guaranteed the faster kits will work at those slower speeds. I would say there is a 70% or better chance you can get them to somewhat play well together. You may have to relax the timings a bit or throw a bit more voltage at them, but you "should" be able to make them work together. 16 gigs is a lot of memory either way so I don't think you're taking a big risk. If you do end up selling the old set (they have a lifetime warranty so you can get close to what you paid for them) you'll still have 16 gigs instead of 8 so its not much of a risk either way.
        ASUS P8Z77-V LK / I5 3350P / 2X F3-12800CL9D-8GBRL Running @ 1866mhz / MSI GTX760 TF

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        • #5
          Do you think my odds are any better going with 'matching' F3-1600C7D-16GTX?
          If the odds are about the same, then it would seem smarter to go for something faster (eg: F3-2400C10D-16GTX 2400 (PC#19200)) and take my chances on winding up with only 16G.

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          • #6
            Using the same memory is most likely to work together as they are going to be similar chips (most likely) especially if the original set isn't too old. But really its up to u on what you want to do. Either is likely to work. I guess you'll have 16gigs either way. more if they work is one way to look at it, but it does cost more.
            ASUS P8Z77-V LK / I5 3350P / 2X F3-12800CL9D-8GBRL Running @ 1866mhz / MSI GTX760 TF

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            • #7
              Well that was too easy?!

              Plugged in a pair of Trident X 2400's ( F3-2400C10D-16GTX) and they booted right up with the old XMP settings (7,8,8,24, 2T). No attempt to add voltage anywhere. A lot of settings on my P8V77 V are on Auto, so I might be faked out there, but as far as I can tell it booted with the old settings just fine. Ran a pass of MemTest with no problems.

              Then I wanted to test my new memory at their intended settings, so I took out the old Ripjaws 1600's ((F3-12800CL7D-8GBXM). Used the bios to set to XMP settings on the Trident X 2400's. Ran them overnight at XMP settings with no problem.

              Going back to 24G total I reinstalled the Ripjaws 1600. I didn't realize bios stayed at the 2400 (CL10, 12 12 31 2T, 1.65v, XMP settings for the Trident X 2400) settings and the darn thing booted! Ran one pass of memtest just fine. Crashed later that night. Still, what the heck? Did I get that lucky with the chips from the Ripjaws 1600?

              I noticed my CPU was running a good 10 degrees C hotter (40's as opposed to 30's). So I reset the bios to the 1600 Cl7-8-8-24 1.5V XMP settings from the Ripjaws set. Seems to be running just fine.

              Now I am wondering, can I get anything noticable from overclocking while staying in the 1.5v range? What should I try? How high can I go while sticking with 1.5 or 1.6? Would I even notice the bump to 1866 or 2000? and what CL settings might I try?

              Thanks,

              GJoneZ

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              • #8
                My "suggestion" would be go for 1866 @ 8-9-9-27 and try 1.55v if that doesn't work use 1.6v. I think it should be fairly stable doing that. I have 2 kits of 1600 ripjaws comfortably running at 1866, and they are worse sticks than yours. 2400 out of them isn't unthinkable, the cl7 ripjaws are pretty good chips, but I woudln't want to run them that hard 24/7. I seemed to notice a bit of a bump going up to 1866, but it could have been more mental than physical. Honestly though unless you notice yourself actually using 16gb at once, your best bet is to just use the tridents at 2400. More memory only helps if you actually use all of what you had before. With the lifetime warranty on the gksill stuff you can actually still sell them for decent money used.
                ASUS P8Z77-V LK / I5 3350P / 2X F3-12800CL9D-8GBRL Running @ 1866mhz / MSI GTX760 TF

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                • #9
                  Originally posted by GJoneZ View Post
                  Going back to 24G total I reinstalled the Ripjaws 1600. I didn't realize bios stayed at the 2400 (CL10, 12 12 31 2T, 1.65v, XMP settings for the Trident X 2400) settings and the darn thing booted! Ran one pass of memtest just fine. Crashed later that night. Still, what the heck? Did I get that lucky with the chips from the Ripjaws 1600 (F3-12800CL7D-8GBXM)?
                  It is very possible, that your Ripjaws are based on a type of IC, that theoretically can do DDR3-2400 10-12-12-31 2T at 1.65V and are somewhat similar to what is on those TridentX (basically Samsung 2Gbit vs 4Gbit). However if your system crashed later on, it probably needs some tweaks here and there from the TridentX XMP settings. If you don't want to fiddle with subtimings and system voltages, you could also try:

                  DDR3-1866 8-9-9-24
                  DDR3-2000 9-10-10-27
                  DDR3-2133 9-11-11-28

                  Start at VDIMM = 1.65V and lower it afterwards if you are stable. It is quite possible, that you will end up around 1.5V +/- 0.75V. Good luck
                  >> The official G.SKILL Memory Frequently Asked Questions (F.A.Q.)! << | [pictures] Show off your G.SKILL products!

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                  • #10
                    If no joy with above might try 1866, 2T, 8-10-10-29 and 1,575


                    Pls offer comments on support I provide, HERE, in order to help me do a better job here:

                    Tman

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