F3-12800CL7D-4GBECO on Crosshair IV

[SteveJK]

Hi everyone,

I've bought 2 kits of F3-12800CL7D-4GBECO for my Crosshair IV and 1090T, but I cannot run them stable at 1600MHz with GSkill parameters (7-8-7-24 @ 1.35V). I have to set the banks working at 1333MHz and upper the voltage at minimum 1.4V to make the pc boot (@1.35V doesn't boot).

What can I do with those banks? I've choosen those kits because they were approved to work with 4 DIMMs in the Memory List of ASUS Crosshair IV... but how is it possible that they doesn't work at specs parameters??

Here is a short list of the machine:

MOBO: ASUS Crosshair IV
PROC: AMD 1090T
RAM: 2x F3-12800CL7D-4GBECO
PSU: Corsair HX-850W
VGA: Sapphire HD 5850 2GB Vapor-X
OS: Windows 7 Pro x64


Thanks for the support

[Tradesman]

Have you checked the sticky for AMD and 1600 sticks? ....here:

http://www.gskill.us/forum/showthread.php?t=7688

[SteveJK]

Have you checked the sticky for AMD and 1600 sticks? ....here:

http://www.gskill.us/forum/showthread.php?t=7688

Of course:

I've tried that config:

Base clock: 240Mhz
CPU Ratio: 13.5 (3240Mhz)
RAM speed: 1600MHz
Timings: 7-8-7-24
VDimm: 1.35V
(All other settings are AUTO)

Result: no boot (stuck on red led "DRAM" on mobo)


I've tried to give the CPU/NB +0,03V and +0,5V... same result.

If I give ram 1.4V or 1.45V passes bios but with a sudden BSOD. Worst than ever...

EDIT:
I've just discovered a new D.O.C.P. profile avaiable after flashing the bios with the 1902, it's called Profile#1 and from description is "Optional DRAM Overclocking profiles on SPD" and "Profile Info" says: 1600MHz-7-8-7-24-2T. I'm going to try it.

EDIT2:
Ok. It boots. These are the values of that boot:

Base clock: 200Mhz
CPU Ratio: 16 (3200Mhz)
RAM speed: 1600MHz
Timings: 7-8-7-24-40-2T (CPU-Z)
VDimm: 1.415V (RC TweakIt and HWiNFO64)

I'm testing it with LinX 0.6.4, and it has passed 8 minutes without errors... let's see what he can do now.

EDIT3:
Stopped upon error after 12m 55s...

EDIT4:
I've set the VDIMM@1.35V but the speed at 800MHz and Auto timings. It booted, logged on Windows, CPU-Z says 6-6-6-18-20-1T for the DRAM Timings...

[GSKILL TECH]

With these settings:

Base clock: 200Mhz
CPU Ratio: 16 (3200Mhz)
RAM speed: 1600MHz
Timings: 7-8-7-24-40-2T (CPU-Z)

Make sure CPU-NB Frequency is 2400MHz.

VDIMM 1.45V

Thank you
GSKILL TECH

[SteveJK]

With these settings:

Base clock: 200Mhz
CPU Ratio: 16 (3200Mhz)
RAM speed: 1600MHz
Timings: 7-8-7-24-40-2T (CPU-Z)

Make sure CPU-NB Frequency is 2400MHz.

VDIMM 1.45V

Thank you
GSKILL TECH

Ok, it booted and ran 10 minutes of LinX test with no issues. I'll leave it for some testing, and I'm gonna update you. Thanks for the support

p.s. All other settings and voltages you didn't mention are left in Auto

[Tradesman]

Let us know how it goes

[SteveJK]

Let us know how it goes

It passed 50 loops of LinX with all ram avaiable (6864MB, problem size 29943) without errors in 5h 30m 13s.

I think it's pretty stable.

Thanks for the support

[GSKILL TECH]

Glad to hear

If you get bored, you can get much more performance out of that kit.

Thank you
GSKILL TECH

[SteveJK]

Glad to hear

If you get bored, you can get much more performance out of that kit.

Thank you
GSKILL TECH

Yeah I know... I've tried 800Mhz 6-6-6-18-20-1T@1.35V and it's fully stable with almost the same performance (to be honest, a little slower than stock speeds).
I'd like to go up with the frequency, but first, which is the highest safe voltage (24/7) for those banks?

[GSKILL TECH]

Use a memory benchmark test to see the breakdown in bandwidth and latency. A timing may be slightly too tight, restricting performance.

The memory should be fine with 1.65V, some people even use them at 1.70V, so you have plenty of room

Thank you
GSKILL TECH