G.Skill Sniper 1866 works at 1600

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miha2

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Why? Is it safe (completely safe) to set it to work at 1866? Why did it set to 1600 by default when I installed Windows? I mean, I know it's BIOS, but just why did the BIOS set it to 1600?

Set the same timings? Or higher? Maybe that's the reason? The voltage? I have i5 4690K, Gigabyte Z97X-SLI
 
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smorizio

smorizio

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all newer ram have an ic chip that the mb reads. you can use cpu-z look under the memory tab to see the ic programed speeds. now on ram that faster then 1600 mb need to have in the bios xmp profile turned on. any speed faster then 1600 is xmp profile in the ic.
 
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miha2

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Can't find the ic info, but here's what the SPD tab says: SPD Ext. (Memory Slot Selection) XMP 1.3, and then in the Timings Table, JEDEC #5 761 MHz, JEDEC #6 800 MHz, XMP-1866 933 MHz, XMP-1866 MHz. The last two differ only by Command Rate: first is 2T, second is 1T. Which one to choose?
 
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miha2

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Been to BIOS, enabled XMP Profile 1. Did nothing else. I think. BIOS said the configuration is wrong and advised me to return to the old settings. I did. Back to 1600. What did I do wrong?
 
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miha2

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All right, according to the Gigabyte website, I have the latest BIOS. There is one more, but it's Beta. So, I don't really know where you take your BIOS updates from; maybe it's so bad they have to release "night builds" but I have the latest BIOS. Maybe I should try to update the settings again? I will try that some time. Other than that, I don't really know what else I may have done wrong.
 
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miha2

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Motherboard is listed in the very first post, memory name is listed in the thread name. If you need the Newegg links, that is more understandable. Otherwise, lazy to scroll?

My rig:

i5 4690K
Gigabyte Z97X-SLI
G.Skill Sniper series 1866 MHz 8GB
Antec EA-750 Platinum
Asus r9 290 DirectCU II

Enough information? Or need the case info, mouse, keyboard, monitor?

And what's PU?
 
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gskill support

gskill support

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Which slots do you have them installed in?

Test one module at a time to see if it can work fine with XMP enabled.

The DDR3 standard is DDR3-1333 CL9 and DDR3-1600 CL11

No matter how great the RAM is, DDR3-2400, DDR3-3000, it defaults to one of the values above. This allows the RAM to be useable in any DDR3 computer. Using a capable CPU and motherboard, you can enable XMP or manually input settings in motherboard BIOS to let it know you are using high performance RAM. But if you do not change anything to let it know, it will remain at standard values.
 
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miha2

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All right, so... This is what I have:

When I checked today (had to restart the computer) the UEFI, it seems to me I not only changed the settings to XMP1 profile, but also might have changed the speed: there was 1600, and I changed it to 1866. That might have been the reason why it didn't allow me to keep those settings.

Now that I have chosen XMP1 and only that, CPU-Z says next:

Memory tab, Timings section, DRAM Frequency part: 933.2 MHz

SPD tab, Memory Slot Selection section, Slot #2 (and #4) Max Bandwidth part: PC3-12800 (800MHz)

Which one do I trust? DRAM Frequency or Max Bandwidth?
 
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