Same spec ram, different brand, wont run same speed

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Mbrady92

Honorable
Aug 27, 2013
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10,510
Hello and thank you for your help,
Pics at the bottom.

I recently had a spare ram kit 2x4GB DDR3 1600mhz CL9 G.Skill Ripjaws 1.5V.
My girlfriends rig has identical ram which is corsair vengeance branded 2x4GB DDR3 1600mhz CL9 1.5V.
Her motherboard is an Asus z87-pro and cpu is i5-4670 which supports 1600mhz at 1.5v.

I know its not ideal to mix and match different branded memory but it was just going to waste. She plays WoW and uses Chrome which is a huge memory hog when she has lots of tabs open.

In bios when applying the XMP profile in advanced settings it does so fine and says the ram is now at 1600mhz. Also windows 10 states the 16gb is running at 1600mhz. However, the default bios homepage says the G.Skill is running at 1600mhz and the Corsair at 1333mhz. So i figured for some reason they wont both play nice at 1600mhz. So i manually set the ram to 1333mhz, but still this homepage in bios lists the g.skill at 1600mhz and the corsair at 1333mhz.

Corsair is in DIMM A1+DIMM B1(Colour coded)
G.Skill is in DIMM A2+DIMM B2(Colour coded)

*If only one brand is installed they run at 1600mhz according to bios homepage.

Any tips appreciated :) thank you.

http://
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Solution
alceryes
It could be that, because of mixing different brands, the board is downclocking the RAM. All the RAM will run at the same speed once the OS is booted (after POST and BIOS). Check out the memory in Windows using CPU-Z to see what it's running at once booted up.
If you want to use these non-matching sticks at 1333Mhz, you should also run some memory stress tests to confirm stability before real world usage (boot off of memtest86+ CD/USB and let it cycle for a couple hours).
If you're feeling adventurous, and don't mind getting frustrated, you could even try to raise the speed AFTER you confirm stability at 1333. You might not be able to though. Heck, it may even fail stress testing at 1333.
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alceryes

alceryes

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Jun 11, 2004
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It could be that, because of mixing different brands, the board is downclocking the RAM. All the RAM will run at the same speed once the OS is booted (after POST and BIOS). Check out the memory in Windows using CPU-Z to see what it's running at once booted up.
If you want to use these non-matching sticks at 1333Mhz, you should also run some memory stress tests to confirm stability before real world usage (boot off of memtest86+ CD/USB and let it cycle for a couple hours).
If you're feeling adventurous, and don't mind getting frustrated, you could even try to raise the speed AFTER you confirm stability at 1333. You might not be able to though. Heck, it may even fail stress testing at 1333.
 
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