bloodhawk Posted November 6, 2011 Share Posted November 6, 2011 Hi! I recently purchased 4x4Gb sticks of - http://www.corsair.com/memory-by-product-family/vengeance/vengeance-4gb-single-module-ddr3-memory-kit-cmz4gx3m1a1600c9.html I was planning on using these on my brand new ASUS P8Z68-V motherboard. Along with a Core i7 2600k. Before , i begin : - I have tested each module separately. Even ran memtest on each module for around 12 hours each. - Have updated to the latest BIOS. - Have not changed any settings in the BIOS. - Tried using the default X.M.P profile. Now the issue - The modules bootup only in pairs of 2. That is, i can only use upto a max of 8Gb memory. The PC refuses to POST, as soon as i add even one extra 4Gb module. Same is the case with all 4 modules plugged in. I tried mix and matching. Same result, the system boots up and functions perfectly with 8Gb of RAM installed. The DRAM voltages are at stock 1.50V. Same is the case with the CPU voltages. Which re at stock. This is getting very frustrating. Since i purchased 16G of RAM specifically for video editing purposes. The worst part being, the retailers in my location do not have a 16Gb kit available. :( Would really appreciate some help. Link to comment Share on other sites More sharing options...
Wired Posted November 6, 2011 Share Posted November 6, 2011 Sounds like either you need more voltage on the memory controller and/or you have a bad slot. Link to comment Share on other sites More sharing options...
Synthohol Posted November 6, 2011 Share Posted November 6, 2011 have you tried all 4 sticks at 1066 or 1333? mixing ram (i understand you were not able to find a complete matched kit) is not ideal for anyone. see the 2 links below for the technicals. as Wired said, you may also have a bad slot/improperly seated CPU causing more trouble on top of mixing unmatched sticks. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted November 7, 2011 Corsair Employees Share Posted November 7, 2011 I would suggest asking the reseller if these can be replaced with a matching 16 Gig set of modules rather than trying to mix 4 single modules like that. Link to comment Share on other sites More sharing options...
bloodhawk Posted November 8, 2011 Author Share Posted November 8, 2011 Thanks for the support guys, the fault was with the RAM slots. I got the motherboard replaced today and got a P8Z68V-PRO instead. and all 4 modules are booting up well. Now my second query, is it possible to run these at 1T? If so how? I tried changing the Command Rate in the BIOS, and it failed to POST, had to do a CMOS reset. I did not touch the DRAM voltages though. Again thank you so much for the assistance.! Link to comment Share on other sites More sharing options...
Synthohol Posted November 8, 2011 Share Posted November 8, 2011 at 1600 its best to run 2t (spec) you will never notice a difference really. Link to comment Share on other sites More sharing options...
bloodhawk Posted November 8, 2011 Author Share Posted November 8, 2011 Hmm, im running the processor at 4ghz right now.. Was thinking of pushing up to 4.5 Ghz for 24/7 usage. Will it benefit as such in the 4.5Ghz scenario? Link to comment Share on other sites More sharing options...
Synthohol Posted November 8, 2011 Share Posted November 8, 2011 the higher the bus speed the more it will negate the difference you will ever see even in benchmarks. (the 1t 2t thing) as long as your temps are ok and its stable overclock away :) Link to comment Share on other sites More sharing options...
bloodhawk Posted November 8, 2011 Author Share Posted November 8, 2011 Well, at 4Ghz temps are around 58C at max. Have been running Prime 95 for the past 1 hour, it touched a max of 57C. Working on the PC simultaneously. CPU voltage is at 1.18 . Even if the temps reach 65C @ 4.5 on full load, im fine with that. Since the ambient here is around 25-30C. Again! Thank you so much for the assistance. Link to comment Share on other sites More sharing options...
bloodhawk Posted November 13, 2011 Author Share Posted November 13, 2011 HEy! I was taking part in a SuperPi XS mod 8M score contest thingy, and having a real tough time pushing the modules beyond 1600Mhz (Processor limit is 4Ghz) . The best timings i could manage on my P8Z68-V PRO are - http://img805.imageshack.us/img805/6852/pirun3.png http://img543.imageshack.us/img543/6656/pifastrun3.png http://img842.imageshack.us/img842/74/pirun2.png Would really appreciate some help, or should i create a separate thread? Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted November 14, 2011 Corsair Employees Share Posted November 14, 2011 With more than two modules installed 2T C/R would be strongly suggested. Link to comment Share on other sites More sharing options...
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