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Mixing old slow RAM and new fast RAM

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August 14, 2014 9:41:55 PM

I was given a PC that had 4GB of A-RAM DDR3 1333.
Not long after this, I purchased 8GB of G.Skill Ripjaws X DDR3 1600.
For the past couple of months I've been running the PC with both installed.
Is this a good idea? Could the cheap / nasty RAM be hampering the new RAM? Or is it better to have the 12GB?

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a b } Memory
August 14, 2014 9:52:48 PM

It's better to have just one type of ram. You should just use the 2 x 4gb 1600. Quite often mixing ram causes BSoD's.
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August 14, 2014 10:15:34 PM

No BSoDs so far, but I have been wondering whether the slower RAM would be holding the faster RAM back?
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a c 2177 } Memory
August 14, 2014 10:33:48 PM

What the DRAM running at? Can check with CPU-Z in the memory tab - it will show true freq (800 for 1600, 667 for 1333 since this is Double data rate DRAM)
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August 15, 2014 12:25:20 AM

Pulled old RAM, new RAM now running at 602.
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a b } Memory
August 15, 2014 3:24:04 AM

Click on the SPD tab in CPU-Z and see what timings and voltage are spec'd to run 800 and manually set those in the BIOS.

Check your M/B manual and put the 8g 2 x 4g modules in the dual channel slots ASUS recommends them to be installed in.
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a b } Memory
August 15, 2014 4:53:53 AM

Or just enable XMP in bios
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August 15, 2014 7:03:56 AM

RAM currently in recommended slots.
Turned off overclocking, and under AI Tweaker in the BIOS set tuning to DOCP, then selected 1600 profile. RAM now running at 800 ^_^
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a c 2177 } Memory
August 15, 2014 8:21:25 AM

Sounds good !
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