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Memory Crashes at 1866 Please review my stuff

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August 17, 2011 5:15:26 AM

I have Sabertooth X58, Core-i7-950, 24 GB RAM (6x4).
CPU @ 3.207Mhz
Ram is stable at 1600Mhz but system will not boot at 1866Mhz.
My settings are:

DRAM 1600Mhz
UCLK Frequency (uncore frequency) 3200 MHz
QPI Link Data Rate Auto
CAS# Latency 9-9-9-24-5-74-10-7-20-0
CPU Voltage Control Manual
CPU Voltage 1.222500
CPU PLL Voltage 1.80
QPI/DRAM Core V. 1.30 (set for 6 RAM sticks)
IOH Voltage 1.10
IOH PCIE Voltage 1.50
ICH Voltage 1.2
ICH PCIE Voltage 1.5
DRAM Bus Voltage 1.50 (as per module)

Is RAM frequency limited here by the CPU MHz?
What settings should be adjusted?
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August 17, 2011 4:09:28 PM

First of all, what is your memory? Is it rated at 1866.

Secondly, articles have shown that 1600 is the "sweet spot" for memory timings (for Sandy Bridge CPUs: Core i5 & i7), regardless of CAS & CL.

So, IMHO, you wasted your money paying for anything over 1600.

I'll look for an article, and give you a link, here.

I found the article is was refering to, here.
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a b } Memory
a b à CPUs
August 17, 2011 4:22:11 PM

foscooter said:
First of all, what is your memory? Is it rated at 1866.

Secondly, articles have shown that 1600 is the "sweet spot" for memory timings (for Sandy Bridge CPUs: Core i5 & i7), regardless of CAS & CL.

So, IMHO, you wasted your money paying for anything over 1600.

I'll look for an article, and give you a link, here.

But he doesn't have a Sandy Bridge processor....
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August 17, 2011 5:48:11 PM

clarkjd said:
But he doesn't have a Sandy Bridge processor....


I believe it would stand true for anything above and after LGA1366 (including 1156, 1155, and the newer AMD's), as long as it's DDR3.
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a c 347 } Memory
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August 17, 2011 6:38:44 PM

I don't know of any tri/hexa-channel kit of 1866 MHz @ 1.50v most are 1.65v.

Today I'm lazy, so either use AI OC Tuner -> DOCP then use the DDR3-1866 OC Profile or AI OC Tuner -> Manual, BCLK -> 160 MHz, and change the CPU Multiplier down or OC the CPU either way. Set ALL of the CAS Timings manually + Command Rate -> 2{N/T}, and raise the DRAM Voltage to Rated voltage; if 1.65 then IMO use VTT/QPI -> 1.30~1.35v,

The problem is the CPU IMC to the DRAM Frequency disparity. Some ASUS MOBO's ALSO require you to Disable 'Memory Protection' for all 24GB to be seen/available to Windows. In any case verify 'Usable' RAM and the H/W Reserved should be 10~30MB NOT __GB.
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a c 347 } Memory
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August 17, 2011 7:46:44 PM

BTW CAS Timings only set (CAS-TRCD-TRP-TRAS & CMD) in other words e.g. 9-9-9-24-2N and leave the others to Auto.
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August 17, 2011 8:40:52 PM

Thank you. RAM is: Corsair Vengeance Blu 8GB (2x 4GB) PC3-15000 1866MHz DDR3 Memory Kit for AMD and Intel Dual Channel Processors CMZ8GX3M2A1866C9B. These are rated 1.5v for Sandy Bridge but are in an X58 board. They are real stable today at 1600. I doubt I can get more out of the system without overclocking. What should I change to get, say, 3600 from the CPU?
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a c 347 } Memory
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August 17, 2011 8:52:53 PM

Okay you're sticking the round RAM into the Square DIMM; 100% guarantee XMP will fail, so 'try' the following:

AI OC Tuner -> DOCP then use the DDR3-1866 OC Profile or AI OC Tuner -> Manual, BCLK -> 160 MHz, and change the CPU Multiplier down or OC the CPU either way. Set ALL of the CAS Timings manually + Command Rate -> 2{N/T}, and raise the DRAM Voltage to Rated voltage; if 1.65 then IMO use VTT/QPI -> 1.30~1.35v.

A. OC Tuner -> DOCP ...

B. AI OC Tuner -> Manual + BCLK 160 MHz

If using a BCLK 160MHz and NOT OC the CPU; math for CPU Multiplier:
3200 / 133.33 = 24
3200 / 160.00 = 20
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August 18, 2011 12:50:42 AM

OK Set DOCP, BLCK is 160, CPU is now about 3600MHz, timings are set manually to 9-9-9-9 2T (Correct?) (2T=Command Rate, Correct), VTT/QPI=1.3), still crashing at 1866MHz (UCLK is x 2).
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Best solution

a c 347 } Memory
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August 18, 2011 2:26:31 AM

It's an either/or DOCP <or> BCLK; Set the AI OC Tuner -> Manual if using the BCLK.

Your 1866 MHz are NOT CAS 9-9-9-24-2N, they're 1866 MHz 9-10-9-27-2N.

If 9-10-9-27-2N fails then use a standard JEDEC 10-10-10-28-2N, an IMO set the DRAM Voltage to 1.55v~1.60v with VTT/QPI -> 1.30~1.35v.
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August 18, 2011 5:03:42 AM

Best answer selected by ramcooker.
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