2x12GB RAM F3-12800CL7T-12GBSR + Asus REIII XMP-Profile - CR3 ?

[Tenchi]

Hi!

I own two Kits (2x12GB) of F3-12800CL7T-12GBSR

http://www.gskill.com/products.php?index=392

The good thing is, they have a serial number like a 24 GB-Kit.
(It fits perfectly with the last numbers)

I went to the Bios and load the XMP Profile, all works fine - but i doesnt load the "T2" timing - only "T3" - my Asus Rampage Extreme III MB called it "CR2 or CR3".

Why is that so?

CPU-Z 1.58 tells me that "T1" is the actual setting - thats wrong!
But i tells me the correct xmp. Profile Setting of "T2" (and not T3) wich the Asus REIII load in the xmp-Profile.

Aida64 (V1.85.1600)

Tells me in the Benches "CR3",

when i change CR3 to CR2 in the Bios it seems to be working - i have to test it.

What do you think its all ok?

I used Bios 1401 and 1502 - but it doesnt change the CR3/CR2 thing...

BTW: I use a 980X


Sorry for my english

Edit: the setting is "Comand Rate".

[Tradesman]

Will need to turn XMP off (it doesn't work with multiple sets) and set up manually to base specs, then if problems, prob want to start by raising DRAM voltage + .05 or so and get back to us

[Tenchi]

Has a one 24GB Kit the same behavior?

or will xmp work correctly?

Edit:

I'm testing with Prime95, these two Kits works fine @DDR1600 CL7-8-7-24 T2 @ 1,5xx V and playing Left4D 2 at the same time.

It looks that i dont have any problems,
all other Bios voltages are set "manually" to the defaut minimum voltages. PQI only @ 1,200V (i have never problems with 1,200V with many Mem-Kits).

I think my 980X is a good CPU with a good mem-controller.

[Tradesman]

XMP is programmed into the SPD of a set, if you have 2 sticks the advanced timings will be different from a 3 or a 4 stick set (as an example the tRFC typically goes up the more sticks you have, so with 2 sticks it might require a tRFC of 74 but with 4 sticks it might be 88 (or whatever), so enabling it with a pair of two stick sets you'd be at 74 which would not be stable.

System is looking good and like all Intel CPUs the 980X has a very good MC

[Tenchi]

Thank you very much for your help and the informations!

These are my Bios settings:







QPI/DRAM Voltage: 1,2000V
DRAM BUS Voltage: 1,52375V (can't use less voltage, Prime95 would not run stable)


Did you see something on the pictures that i can optimize?

Something that i can try?


Thanks!

[Tradesman]

Looks pretty good, as long as stable

[Tenchi]

Thanks!

i have to raise the DRAM BUS Voltage from 1,51050V to 1,52375V,
needs more testing

[Tradesman]

That's still reasonable, just when raising go in small increments.

[Tenchi]

Now i change the comand rate from "t2" to "t1",

and Prime95 runs since 7h perfect - with some games playing at the same time.

If i know more, i let you now!

[Tradesman]

Sounds even better, 1T will be better performance wise, can run a Benchmark program at 1T and then again at 2T and should show 1T a little better

[Tenchi]

AIDA64 V1.85

T3 / CR3:
READ: 16.500 MB/s
SWRITE: 14.710 MB/s
COPY: 16.060 MB/s
Verz?gerung: 55,4ns

T2 / CR2
READ: 17.100 MB/s
WRITE: 14.717 MB/s
COPY: 16.133 MB/s
Verz?gerung: 53,9ns

T1 / CR1
READ: 17.388 MB/s
WRITE: 14.711 MB/s
COPY: 16.160 MB/s
Verz?gerung: 53,2ns

[Tradesman]

Looking good, some nice fine tuning!