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ultimate99

new ram

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I got a new laptop with a 4gb ram (1600). Would performance be affected if I use an older 4gb (1333) from my t420?

 

T440p, Win8.1 pro, i7 4700MQ.

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You should list your Operating System.

 

Read your Owner's manual.

 

Download it if you do not have one.

 

I doubt you will notice much difference in performance.

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That CPU supports - Supported memory: DDR3-1600, DDR3L-1333, DDR3L-1600

 

Is your 1333 ram Low Voltage or regular, regular won't work.

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Sure, everything will clock down to 1333 (well 666Mhz x2), but as hum said, you probably won't notice in practice.

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