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Different size sticks same speed?

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June 27, 2011 6:28:07 AM

I currently have the Asus P8H67-M Pro motherboard with 4 GB (2 x 2GB) of Crucial RAM, 1333 Mhz, CAS 9. I just ordered two more sticks of RAM which are 4 GB per stick, 1333 MHz, CAS 7. Will any problems occur if these two sets are in the motherboard together?

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a b } Memory
a b V Motherboard
June 27, 2011 7:27:48 AM

yes.. different cas too many cause problem, don't mix it, use your new ram .with 1333 Cas 7 your system will be faster than before.
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a b } Memory
a c 107 V Motherboard
June 27, 2011 9:43:58 AM

For best compatibility, cancel the new kit and get the same exact memory you got before.

If the new kit has already shipped, you will have to run the new memory at CAS 9 settings to match the old memory. You wasted money on the CAS 7 kit.
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a b V Motherboard
June 27, 2011 3:36:03 PM

im running 8GB (2x4GB) and 4GB (2x2GB) of the same exact ram with the same CAS and it runs fine. you might be fine if you set the CAS timings manually to the higher number (CAS 9) but you could have issues.
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June 27, 2011 5:36:44 PM

Thankyou for the answers. I wasn't sure if there would be a problem because each set will be running on a different dual channel link.
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June 27, 2011 5:47:46 PM

Thankyou for the answers. I wasn't sure if there would be a problem because each set will be running on a different dual channel link.
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June 27, 2011 8:26:27 PM

Best answer selected by nemesis4895.
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