Originally Posted by hurricane28
Nah i can't i tried it before and it was a no go, and even than is it that much of an difference running it CR1 or 2? does that give so much more?
Indeed AMD does not scale that well with higher speed RAM so i am at the limit of what the chip can handle.
I can get more RAM speed and maybe to CR1 but i have to lower everything to become stable at that speed, so maybe i am going to try that.
i am on 5ghz now with 2570 CPU/NB at 1.3 volts and HT at 2827, higher HT gives me instability and is not necessary for my setup so i leave it there.
CPU is at 1.536 and under load its 1.586 i set the LLC to extreme because that gives me more stability but i am at the limit of what my chip can handle so if i want to run better timings and CR1 i need to lower my CPU speed a bump because i do not want to put any more volts to it than it already has.
And what does that IMO means? lol
CR1 means better, faster, more bandwidth than CR2
CR2 means more stable than CR1
Off the primary RAM Timings, http://www.hardwaresecrets.com/article/Understanding-RAM-Timings/26/2
CL-TRCD-TRP-TRAS-CR or as labeled i.e., 8-9-9-27-1 are as follows:
1. In my experience spending sleepless nights tweaking with RAM timings, CL or CAS Latency
can shave you somewhere ~3ns off you latency performance by going 1 step down with everything kept constant. This value has the greatest impact on RAM performance aside of course from RAM MHz count.
on mine, meant the frequency range I can run my RAMS, 8-9 is for 1600, 10-11 for 1866-2133**( **with some voltage bump), 12-13 for 2133-2400;
TRCD of 9 prevented me from booting or entering BIOS POST at 1866. But 13, enabled me to run 2400.
- must not be lower than CL, depending on your RAM, while keeping your CL and TRCD timings constant, adding 1 or 2 increments to the TRP, can enable you to run up to 266 MHz more from your RAM.
At stock of 1866 9-11-9-27-1, I can run 2133 9-11-11-30-1 with lesser voltage to add from stock than running it at 2133 9-11-9-27-1.
4. When messing with the timings, it's nice to know the basic calculation on how to get TRAS
values. However, This has very little effect as incorrect or less than required, you'll just encounter some errors on some apps but won't prevent you from booting.
5. Most testers or RAM OC'rs start off with CR2
when trying out high clocks as that can ensure better stability. Then try out CR1
for better performance.
Doing my RAM tweaking, after a lot of sleepless night just trying to get a hold on understanding how RAM Timings work, I found out that my specific Chip loves to run at this sequence,CL + 2 = TRAS
or i.e. 9-11-9 ; 10-12-10; 11-13-11. That way a little voltage or even nothing at all should be added to stabilize. And I can't run 1866 at TRAS of 9, 2133 at TRAS of 10.
But satisfying their minimum TRAS requirement
, I am able to RUN 1866 at 8-10-8-24
2133 at 9-11-9
and 2400 at 10-12-10
!!! (Of course with some bump on the voltage)
Quite mysterious isn't it?
Take note on yours mate. As I have experienced what you are saying too. I can run 2133 at 9-11-9-27 with a CPU speed of 4.667Ghz NO PROBLEMS. But jumping to 4.8, I have to loosen down 2133 to 10-12-10-30 to keep it from not CRASHING. That's one timing on everything down. But Bandwidth almost stay the same. I guess I overly saturated my RAM at that timing and that speed. That bandwidth no longer scaled.
So maybe you can loosen your timings since you are running 2400 MHz using FSB OC. And at 5GHz, maybe you just need to loosen some timings. Maybe 2400 11-12-12-36-1 will do you good on stability and lesser Voltage bump.
Again, These are just my experiences. Maybe yours would be different. But who knows? Or how would you know if you won't try? LOL
Anyway, CPU-NB and FSB
dictates alot on RAM performance. Edited by mus1mus - 10/11/13 at 12:07pm