CPU-Z JEDEC's and sticker specs

[Lutfij]

hey there!

I currently own this kit running on an Asus Rampage Extreme x48 (rig 1 in member config)

and here are the specs via CPU-Z;

After a glance at AI probe II's voltage readouts of DDR (while the voltages were set to auto in bios) i noticed they were running at 1.59V sticker and site say 1.8V but a glance at CPU-Z said 1.5 so i went into BIOS and set it to the lowest i could set...1.51V

* In contrast the ram seems to run without hiccups whereas previously it would often create little stutters in game.

question;
If I'm running these dimms at 1.5~1.51V (actually below 1.65V even without adjustment) can i run other dimms that are certified to run on 1155/1156 socket builds(i.e; 1.65V) like the mushkin ridgeback's or mushkin 996970 and similarly can i drop the OCZ dimms into any sandy bridge mobo/build?

Thanks for your time!

 

[ncc74656]

many ram modules will be able to run higher and lower than jedec suggests. I myself have used many ram modules at much higher voltages than 1.65 spec during over clocking. I have seen the same type of issue that you have on nearly every single AMD system i have built over the past 4 years. it seems to me that AMD system just have no idea how to set stock voltages or clock speeds on CPU/ram. that said i have only encountered this a couple times on intel and even then ONLY when i turn on XMP to run ram at 1600 vs 1333. in most cases ram is meant to run at 1.5 with lower speeds such as 1333 and to run at 1600 it is required to run at 1.65V. this has been the standard for many years up untill 1155 with sandy bridge. now 1.5V is the standard for 1333 and 1600. I have taken 1.65V kits and ran them at 1.5 with out stability issues at 1600 but i have had to switch them from 1T to 2T timings. 1156 boards can run 1.65 but 1155 is designed for 1.5, there are plenty of people who say they have run 1.65V on 1155 but its outside of intel spec to do so. I myself run 1.82V ram on my 1156 with out issue for the past year and a half.

bottom line is you wont know what voltages you can drop or raise ram/mb to until you get it. even 2 kits of the identical sticks can yield different results when running outside of factory spec. I find it is not uncommon for the bios to improperly set voltages and frequencies. on my comp i can not run on stock auto settings with out BSOD's I run with a heavy OC so its not an issue but if i clock down to stock speeds i need to manually set multipliers, disable voltage drops and manually set voltages or else the comp crashes.

every product will be differnt.

 

[Lutfij]

thanks for the reply...i also encountered the same BSOD auto voltage issue with 2 H67H2-M builds about a month ago.

I even spoke with the guys at mushkin support and they also mentioned something similar to what you said. Though he did say i can run the kit on my mobo as it natively supports 1600MHz...but the voltages were what had me going bonkers :S

for future reference's;

further digging yeilds that most people on the net are getting the RE x48 as a collectors item and using G.skill 1.5~1.65V(1155 certified) dimms on their builds and they are getting good results as far as OC'ing and benching is concerned.

bottom line - you can use them. If its BSOD'ing check/recheck BIOS volts.
* the 1.65V limit is so that the IMC doesn't get fried..thas all otherwise you can run DDR3 dimms near 1.9V - or so as my digging has;

links;

http://forum.corsair.com/v2/showthread.php?t=77480
http://www.gskill.us/forum/showthread.php?t=8919
http://forums.guru3d.com/showthread.php?p=3266910
http://forums.anandtech.com/showthread.php?t=2185024
http://www.mushkingames.com/phpbb2/viewtopic.php?f=4&t=15843
http://www.xtremesystems.org/forums/showthread.php?270304-Ram-Question-About-Rampage-Extreme-X48#post4967708

*G.skills mem configurator directs me to purchasing 1.5V dimms rated @ 1600MHz so

cheers.

 

[Lutfij]

Best answer selected by Lutfij.

 

[rubix_1011]

This topic has been closed by Rubix_1011