F3-12800CL9D-4GBRL and F3-12800CL9D-8GBXL settings

[Triplehammer]

Motherboard: Intel DP67DE B3 (the Cougar Point revision), latest BIOS 0072.
RAM: F3-12800CL9D-4GBRL and F3-12800CL9D-8GBXL
CPU: Intel i5-2500K at 3.30GHz, not overclocked (default settings), Hyper 212+ CPU cooler (CPU runs at 27C at idle)

My first question is:

The XMP profile fails to boot even though the equivalent manual settings are stable.

I have been running with the F3-12800CL9D-4GBRL set for some time but had left it at the MB's default 1333Mhz settings. This week I decided to get it running at the 1600Mhz settings it was meant for.

Enabling the XMP profile does not work, and the PC starts an endless loop of rebooting every 5 seconds; Intel's Failsafe Watchdog fails to kick in and I must manually reset the BIOS.

At the standard memory voltage setting of 1.500V, the BIOS monitoring shows Memory Vcc to waver between 1.50V and 1.51V and Speedfan 4.45 agrees (calling it SDRAM Vcc). I increased memory voltage to 1.600, BIOS and Speedfan show it holding steady at 1.61V, and Speedfan says the Memory DIMM is running at 32C. The XMP profile still won't boot.

I found elsewhere on this board this recommendation for F3-12800CL9D-4GBRL timings settings:

Memory Multiplier_____12DR3-1600 (default is 10DR3-1333)
tCL_______8
tRCD______8
tRP_______8
tRASmin______24
tRFC______74
tRRD______4
tWR_______10
tWTR______ 4
tRTP______4
tRC_______33
tFAW______24
Command Rate_____2T (you can try 1T, it is faster) (I used 1T)

These manual settings worked, and were stable for a few hours on MemTest86+ 4.20. When I attempted to use the XMP profile again, it set tCL, tRCD and tRP to 9, tWTR and tRTP to 5, and tFAW to 20, and failed to boot. I went back to manual, leaving the settings the XMP profile had left behind, and again it worked. I have left it at 8-8-8-24-74-4-10-4-4-33-24-1T and all is well. Any reason why XMP fails even with valid settings? Is tFAW better at 20 or 24?

Edit: I have just experienced a crash in a program that has never crashed before I changed these settings, so I'm backing it off to 9-9-9-24-74-4-10-5-5-33-20-1T like the XMP profile set it.

My second question is:

I have recently bought F3-12800CL9D-8GBXL to increase my RAM from 4GB to 12GB but have not yet installed it. Should I simply use the same settings for the 8GBXL as I am for the 4GBRL?

[Tradesman]

With two sets, XMP won't work as each set has it's own settings for XMP, so they have to be set up manually, the timings you listed look pretty good, but may need to raise the DRAM and/or the VTT voltage

[GSKILL TECH]

This is the memory's actual specifications, apparently XMP is not correct, so always use manual settings.

9-9-9-24-88-5-13-6-6-40-20-1T

For 12GB, you can TRY 9-9-9-24-128-5-12-6-6-40-20-2T

Also, a single kit can do 8-8-8-24, but voltage needs to be 1.65V.

Thank you
GSKILL TECH

[GSbyte]

Hello, I'm new here

I have a motherboard GA-EP45T-UD3P with Intel Q9550 2.83 CPU and DDR3 Gskill F3-12800CL9D 8GBRL-and-F3-12800CL9D 8GBXL Win 7 Ultimate 64
It can guess BSOD'S full steam ahead, so I changed the timings manually in BIOS, I have to keep in mind that the frequency of 1333 MHz, only interests me the use of 16GB, the first attempt:
7-7-7-19

rc 26
rfc 86
rrd 4
wr 8
wtr 4
rtp 4

I Have run Memtest86 no problems
now run prime95....

[GSbyte]

and DRam voltage 1.580 V...

[Tradesman]

Sounds good so far, let us know how it goes

[GSbyte]

Update News...
... and is stable but not 100%, (Compared with baseline), at the end of the test Primenet, 2 errors
ERROR: ROUND OFF (0.5)> 12:40
Rounding was 0.5, expected less than 0.4
BSOD's, just then, having failed to reboot the BIOS, the BIOS only the second start.
At Prime 95, torture test, the 3rd option, Blend test fail in less than a minute, options 1 and 2, no error detected, just fine.
Can I increase the DRAM voltage to 1.70 V?
Or other options ?
Thanks in advance

[GSbyte]

Sorry for that
My mistake
ERROR: ROUND OFF (0.5)> 0.40

[Tradesman]

Maybe up to 1.6-1.61 on DRAM voltage