What are the standard timings for F3-12800CL9D-4GBRL at DDR3-1600?

[SisyphusV]

G'day,

SYSTEM INFORMATION:

Memory: Two F3-12800CL9D-4GBRL kits (i.e. 8GB in four, 2GB Modules)
CPU: AMD Phenom II x6 1055T
Motherboard: Gigabyte GA-870A-UD3 (F5a BIOS)
Operating System: Windows 7 Ultimate Edition x64


PROBLEM:
My system defaults the memory to DDR3-1333. When I manually change the speed to DDR3-1600 I need to input many different timings.

The BIOS gives two options:
1. SPD; which seems to be for DDR3-1333 and is therefore too "tight". It causes BSODs.
2. Auto; which I presume is a fail-safe and therefore very "loose" (i.e. 11-11-11-29-2N ). I hope to do better.

Some timings are listed on the G.Skill product page (here), but I need help filling in the blanks.

So, can anyone help me with the standard timings for F3-12800CL9D-4GBRL at DDR3-1600?

Freq._____800
Volts_____1.5
tCL_______9
tRCD______9
tRP_______9
tRAS______24
1T/2T_____2
tWTR______?
tRFC______?
tWR_______?
tRTP______?
tRC_______?
tRRD______?


Cheers.

[GSKILL TECH]

You don't need to worry about advanced timings just yet. First, how do you have the memory configured to DDR3-1600?

Are you using the DDR3-1333 memory ratio, then setting CPU Bus Speed to 240? For full slots, you may need to raise CPU-NB Voltage a notch +0.1V, but other than this, it should be perfectly smooth without any advanced timing changes.

Thank you
GSKILL TECH

[SisyphusV]

First, how do you have the memory configured to DDR3-1600?
Are you using the DDR3-1333 memory ratio, then setting CPU Bus Speed to 240?

No, I just changed the Memory Clock in the BIOS to 8x 200 MHz, as seen in this picture: MB Intelligent Tweaker

The memory timings my BIOS wants are shown in this picture: DRAM Configuration

With some more googling I found this image: SPD screenshot
I can't run the SPD utility because my PC has an integrated memory controller, so are those settings for XMP#1 (in the top-right section of the image) accurate?

That is:
Freq._____800
Volts_____1.5
tCL_______9
tRCD______9
tRP_______9
tRAS______24
1T/2T_____2
tWTR______6
tRFC______88 (90ns I guess?)
tWR_______12
tRTP______6
tRC_______40
tRRD______5

For full slots, you may need to raise CPU-NB Voltage a notch +0.1V

Picture: MB Intelligent Tweaker
Which of the BIOS settings in the above picture is CPU-NB Voltage ?
1. DRAM Voltage Control
2. NB Voltage Control
3. NB PCIE Voltage Control
4. CPU NB VID Control

Cheers,
Thanks for the help.

[GSKILL TECH]

#4.

You can use the x8 multiplier, but also raise NB Frequency to x12.

Thank you
GSKILL TECH

[SisyphusV]

You can use the x8 multiplier, but also raise NB Frequency to x12.
GSKILL TECH

Do you mean I should use the x8 multiplier AND raise NB Frequency to x12, or just that I can get to 1600 either way?

...increasing the NB frequency would be overclocking right? I don't really want to do that. I just want to run my system at optimum speed, but within spec.

Also, are the timings I listed in Post #3 accurate?

[Tradesman]

if you use the 8x multi you need to raise NB freq also. Technically running the sticks at 1600 is OCing as the default is 1333 - so it's not a problem......timings look good

[GSKILL TECH]

For optimum performance, with the memory at DDR3-1600, the NB Frequency should be 2400MHz. Sure you can operate it 2000MHz, but you may be bottlenecking bandwidth. If you want to avoid overclocking, you might as well run the memory at DDR3-1333 with 8-8-8-24 timings. The lower timings would perform better.

Thank you
GSKILL TECH

[SisyphusV]

If you want to avoid overclocking, you might as well run the memory at DDR3-1333 with 8-8-8-24 timings. The lower timings would perform better.

OK, so I guess the question becomes: what are the standard timings for F3-12800CL9D-4GBRL at DDR3-1333?

Freq._____666
Volts_____1.5
tCL_______8
tRCD______8
tRP_______8
tRAS______24
1T/2T_____?
tWTR______?
tRFC______?
tWR_______?
tRTP______?
tRC_______?
tRRD______?


Cheers.

[Tradesman]

It will be the 8-8-8-24 along w/ the CR at 2T..the rest at auto. If stable, you could then try the CR at 1T for a slight DRAM performance boost which the sticks might or might not accept...if they don't revert back to the 2T.....Again if all is stable at 1333, could also try running the CL at 7 for a boost, maybe start at 7-8-8-24 and see how it handles it (again w/ the CR at 2T) and remainder at auto

[GSKILL TECH]

Freq._____666
Volts_____1.5
tCL_______8
tRCD______8
tRP_______8
tRAS______24
1T/2T_____2T (you can try 1T, it is faster)
tWTR______ 4
tRFC______74
tWR_______10
tRTP______4
tRC_______33
tRRD______4

Thank you
GSKILL TECH