MasterEE Posted August 20, 2009 Share Posted August 20, 2009 I have 2GB and want to add more RAM. The problem is that I don't care about overclocking, but the RAM I've got is higher performance with 4-4-4-12 timing. Can I add RAM with 5-5-5-18 timings (because it's easier on my wallet) and what implications does that have? I'm assuming that I should be able to slow down my existing RAM to those timings so that they all play nicely? I'm looking at getting something like TWIN2X4096-6400C5 or TWIN2X4096-6400C5C. On a side note, what is the difference between these, besides the "C" in the name? Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted August 20, 2009 Corsair Employees Share Posted August 20, 2009 It is never a good idea to mix memory as it will be hit and miss if they will work or not, but if you do I would suggest setting the memory frequency to DDR667 and leave the timings set to AUTO and set the memory Voltage to 2.0 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. TWIN2X4096-6400C5 or TWIN2X4096-6400C5C. On a side note, what is the difference between these, besides the "C" in the name? A: they are the same part just the part with the "C" at the end of the part number has a different Heat Spreader. Link to comment Share on other sites More sharing options...
MasterEE Posted August 20, 2009 Author Share Posted August 20, 2009 I'm intrigued by the answer and would like to understand more. Would you mind being a little more specific as to why I would want to lower the speed to 667 and use default timings, rather than leaving it set to 800 (as they both are DDR2 800) and adjusting the timings to 5-5-5-18? Would it be faster to do your method rather than slowing the timing down, more stable, or...? And why 2.0V when my current RAM says 2.1? Thanks in advance for your response. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted August 20, 2009 Corsair Employees Share Posted August 20, 2009 I have posted that so many times I am sure if you search for it you will find it. But in a nut shell there is more loading on the memory controller, memory and CPU as you add more modules and its common to have to slow the memory down as you add more modules. Not to mention we do not test Twin sets in 4 up configurations only as they are sold as one set. Link to comment Share on other sites More sharing options...
kokito_malik Posted August 21, 2009 Share Posted August 21, 2009 I suggest you make a sticky with the 4up vs. 2 up and why it is harder on the mem controller! :) Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted August 21, 2009 Corsair Employees Share Posted August 21, 2009 I have many times its nothing new and been an issue with un-buffered memory ever since day one. Link to comment Share on other sites More sharing options...
MasterEE Posted August 22, 2009 Author Share Posted August 22, 2009 Ram Guy, I actually tried searching the forums before posting, but as a newbie to this kind of thing, my search wasn't very effective. After searching some more based on your reply, I found some good posts on 4 slot memory configuration, as well as the Application Notes on "4 up", latencies, etc. I would suggest making that one of your signature links. Maybe app notes aren't helpful for some people, but I enjoyed reading several of them since I last posted. Again, thanks for your time and help. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted August 24, 2009 Corsair Employees Share Posted August 24, 2009 There was a few stickies on it I think they were un-stuck but I will be working on the forum and updates this week and next. Link to comment Share on other sites More sharing options...
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