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BIOS Configuration for INTEL Motherboards Discuss BIOS/EFI Configuration for specific INTEL motherboards

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Old 01-17-2017, 11:00 AM
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Default F3-2133C9D-16GXH + Gigabyte GA-Z68X-UD3H-B3 + Intel i7-2600S

HI there,

I I am unable to get the system to boot after enabling XMP Profile 2 and all settings on auto. I have tried numerous configurations with timings and voltages and I still get the same problem. The system will start up, then restart immediately giving an error about unable to boot due to voltages. I haven't even seen a loading screen when set to rated speeds.

Booting at 1600MHz works fine, but 1866 or 2133 (manual settings and XMP profile 1/2) do not work.

Is this a motherboard problem, settings problem, RAM problem, or something else?

There is a similar thread with the headline F3-2133C9D-16GXH + GA-Z68X-UD3-B3 + i7 2600k and the same problem,
but the settings mentioned there did not work for me. Note, that I am using a i7 2600S, which is supposed to be unoverclockable, but still oc up to 3.4Ghz.

Any hints on what I should do?

Thanks in advance and kind regards,
Benjamin
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Old 01-17-2017, 11:28 AM
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Maximize the tRFC memory timing setting in BIOS. You may need to try 1866 first, not sure if that CPU can support 2133.
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Old 01-19-2017, 10:34 AM
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Hi there,
with a tRFC memory timing setting of 255 with XMP 1 profile and 2133 Mhz works.
As I understand, this slows the ram extremely, what can I try now, since I now know, that 2133 Mhz work in principal?

Thanks
Ben
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Old 01-19-2017, 02:21 PM
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Higher density ICs need bigger tRFC values compared to lower density parts at a certain frequency. 8GB modules usually require a tRFC of 300+ for DDR3-2400+, while double sided 4GB modules can get away with half of that. If you don't actually need the capacity, a high end 2x2GB kit from way back when can run at DDR3-2133 with a tRFC of only 88 no problem. So pick your poison
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Old 01-24-2017, 03:01 AM
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Since my system is stable now with 2133 Mhz I wanted to ask if I can tinker with / improve any of my settings. They are right now:
DRAM Voltage 1.6V
DRAM VRef. 0.75V
DRAM Termination 0.75V
CH-A+B Data Vref. 0.75V
CH-A+B Address VRef 0.75V
CAS Latency Time 9
tRCD 11
tRP 11
tRAS 31
tRC 33
tRRD 4
tWTR 8
tWR 10
tWTP 21
tWL 8
tRFC 255
tRTP 8
tFAW 20
Command Rate CMD 2
IO Latency 2
Round Trip Latency 39

Thanks in advance
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Old 01-24-2017, 05:59 AM
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How are your Aida scores looking? You should get around 30K Read/Copy/Write at DDR3-2133.

Have you tried 1T Command rate? tWL 7/6? Other than that you can maybe get a bit more performance out of the tertiary timings:



(this is a 2x2GB kit, so ignore the difference on the primary and secondary side)
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