G.Skill TridentX Not Running at Advertised Clock Speed

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I bought 16gs of G.Skill TridentX DDR3-1866 memory for my pc and even though it is advertised with a clock speed of 1866 my computer will only run it at 1600. When I try to manualy set the speed in the bios my system will just crash.
Why can't I run at the full 1866? :??:

System:
CPU: AMD FX-9590
CPU Cooler: Cooler Master Seidon 120M 86.2 CFM
Motherboard: Gigabyte GA-990FXA-UD3 ATX AM3+
Memory: G.Skill TridentX 16GB
Storage: AMD 120GB Solid State and Seagate Barracuda 1TB
Video Card: Gigabyte GeForce GTX 970 G1 Gaming
Case: NZXT s340
PSU: EVGA 850W 80+ Bronze
 
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When I applied XMP it changed the speed to 1866; yay! :D Thanks for your help! I'm wondering though, why did I have to change it to XPM? Shouldn't it have be automatically 1866?
 
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gskill support

gskill support

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No, with AUTO settings it is DDR3-1333/1600 depending on platform. This allows the RAM to be compatible with any DDR3 computer. Then if you have a motherboard and CPU that can handle high frequency RAM, it is necessary to manually input settings or enable XMP so the motherboard can detect settings from the RAM and automatically adjust them for you. If you do that then everything can run at full speed. :) Enjoy!
 
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el_arantis

el_arantis

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I have the same ram and motherboard (rev4.0 F3 bios) with fx8350
XMP Profile 1 says 2T and XMP Profile 2 says 1T
When I choose XMP Profile 2 it still manages ram at 2T, why does this happen???

Thank you in advance
 
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el_arantis

el_arantis

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The truth is that I did not try anything manually because I assumed that it had to be set right using the XMP Profile
 
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el_arantis

el_arantis

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When you set XMP which do you chose profile 1 or 2?
When you choose 2 does your ram sets to 1T or remains to 2T?
 
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el_arantis

el_arantis

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I set it manually, only the 1t all other timing auto concerning the profile, and it has no problem at all.
But why motherboard does not set it automatically? Could that be a motherboards directive for safety reasons not to set 1T automatically? Do you have any opinions?
Thank you very much in advance!
 
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el_arantis

el_arantis

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First of all thank you for your reply and support, it is much appreciated.
I am a customer and fun of G.skill for years now, really,
my DDR2 old system and my laptop has your modules on.

You mean that when I select profile 2 it is 2T automatically?
Because a friend of mine who has Asrock 970 Extreme4 when he chooses
profile 2 he gets 1T automatically and it is 970 chipset not 990FX.

I am sending you a pic from cpux spd tab.



Thank you once again.
 
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el_arantis

el_arantis

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Profile 2 and manually select 1T it is stable, I have no problems at all. So it supports it I suppose.
My wondering is just why the mobo does not obey automatically to profile's 2 directives concerning
command rate, all the others are ok.
 
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