Overclock.net › Forums › Components › Memory › Confused about RAM timings
New Posts  All Forums:Forum Nav:

Confused about RAM timings

post #1 of 13
Thread Starter 
Hi.

I was just wondering which settings should I adjust when overclocking memory. And is always lower better when overclocking or should the settings be "syncronized"?

Attachment 196889

Should I touch only the TCL, TRCD.. or also the TRWTTO, TWRRD..
post #2 of 13
The command rate, first four (8-8-8-22), and tRC are the most important. Ideally tRCD + tRP = tRAS; tRP + tRAC = tRC. Remember IC binning is different, take them down one at a time. i.e. you might not be able to do 6-6-6 but can do 6-7-6. But don't expect extremely good results, 1333 CL8 is pretty much about generic quality.
post #3 of 13
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
The command rate, first four (8-8-8-22), and tRC are the most important. Ideally tRCD + tRP = tRAS; tRP + tRAC = tRC. Remember IC binning is different, take them down one at a time. i.e. you might not be able to do 6-6-6 but can do 6-7-6. But don't expect extremely good results, 1333 CL8 is pretty much about generic quality.
Those were 1333 CL9 dropped down to CL8 with stock voltage, never got them further though. But now I have a new kit, 2x4GB 1333mhz CL9 and Im hoping I could get these a bit higher. And that tRAC got me confused as I didnt find any setting for it in the bios, at least on the picture. I googled it but didnt find out anything :/ Oh and thanks for your help, you cleared out few things

EDIT: Cant even boot up if I try using 1600mhz or CL7.. Crap. How much voltage is safe to use if I have heatspreaders?

EDIT2: Im now using 8-8-8-20-24 with 1,8V (probably could get a lot lower with voltage but havent finetuned yet..). I also noticed that I could drop TRC to 11 (the lowest setting) with computer still booting normally and not giving me any instant errors in memtest86. Dont really feel comfortable with booting into windows with probably unstable memory as it might corrupt my system quite badly so Im using memtest86..
Edited by Tuxi - 2/23/11 at 7:38am
post #4 of 13
Don't expect much, from what I've seen the generic 1333 CL9 4GB DIMMs don't really overclock as well, because to begin with the ICs on 4GB DIMMs are really just not as good. The settings I meant you should use are tCL, tRCD, tRP, tRAS, tRC and command rate.

Did you say 1.8V for 1333 @ 8-8-8? That's way too much... What is your rated voltage with your new kit!?
post #5 of 13
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
Don't expect much, from what I've seen the generic 1333 CL9 4GB DIMMs don't really overclock as well, because to begin with the ICs on 4GB DIMMs are really just not as good. The settings I meant you should use are tCL, tRCD, tRP, tRAS, tRC and command rate.

Did you say 1.8V for 1333 @ 8-8-8? That's way too much... What is your rated voltage with your new kit!?
I was just experimenting, if it even booted with 1.8V. I never planned on using 1.8V on daily use. Also I didnt even manage to get them stable with CL8 so I kinda gave up, I knew I was buying lowbrand memory (TeamGroup Elite) but I didnt know it was this bad. But thanks again for your help + definately some rep for giving me useful info for the future
post #6 of 13
Keep in mind most PSC IC RAM starts to degrade at 1.75+V. Since most mainstream RAM is powerchip/PSC and otherwise most RAM it is hard to tell exact IC, I don't recommend use of 1.8V.
post #7 of 13
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
Keep in mind most PSC IC RAM starts to degrade at 1.75+V. Since most mainstream RAM is powerchip/PSC and otherwise most RAM it is hard to tell exact IC, I don't recommend use of 1.8V.
That was highly experimental, just to see if it boots. I would never use over 1.7V on long run.. Appreciate your concern though
post #8 of 13
Thread Starter 
Just opened CPU-Z and I noticed that the JEDEC is kind of weird for this memory.

Attachment 197346
post #9 of 13
It always looks weird like that. Sometimes XMP/rated timings are not programmed onto SPD if that was what you were looking for.
post #10 of 13
Yeah, my sticks are rated at something like 7-8-8-24, but my JEDEC numbers are similar to yours. Started messing with timings @ stock voltage and eventually got 6-8-6-20. I would try 7-8-7-20 @ 1333.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Memory
Overclock.net › Forums › Components › Memory › Confused about RAM timings