Can't dual Ram on mobo asrock fatal1ty 990fx pro

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Boyxmen007

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Oct 19, 2014
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I've just bought new Ram "G.SKILL SNIPER - 8GB (2X4GB) DDR3 2400MHZ -F3-2400C11D-8GSR" , but when i installed on my mobo ,i noticed in the bios that although it detects RAM at dimm A2 & B2 its running in Single channel and not full bus (only 1600)
I switch to another dual channel (A1 & B1) & boot back. Bios showed 2 dimm slot working but still in Single Channel only.
And in both situations when im in windows 8.1 , it showed 8GB but only use 4GB on task manager
I tried to test with 1 ram at a time .
A1 - no boot
A2 - no boot
B1- boot
B2- boot with full bus 2400

After that , I tried to config in OC tweak and of course use XMP profile but nothing has changed . I also checked my cpu 's pin and its fine . So my question is was my modo damaged and why it showed just single channel on both situation . Plz help me , i am at a loss
my PC
Fx 8350
Asrock fatal 990Fx pro
G.SKILL SNIPER - 8GB (2X4GB) DDR3 2400MHZ -F3-2400C11D-8GSR
SS 620


Best regards to all
 
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Boyxmen007

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Oct 19, 2014
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Of course i tried it too and nothing has changed
 
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TheDualshock

TheDualshock

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Jan 24, 2014
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If your first 2 slots aren't working with either RAM, it may mean that those slots are faulty. To be absolutely they are defective, if you can test with a other compatible RAM. In Windows 8.1, are you running a 32-bit operating system? Use CPU-Z to identify clock speeds and all hardware related stuff.
 
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Boyxmen007

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Oct 19, 2014
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4,510


I had Ram 4Gb avexir bus 1600 cas 9 before . but it wasnt work with slot 1 and 2 , but work with slot 3 4 . I tried ram kington and it doesnt work with slot 1 2 too . and my os is 64bit
 
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