Question: Can I mix memory modules with different CAS latency?
Read our answer below:
The short answer is yes but your laptop will suffer a small (up to 5%) performance hit in most cases. The longer answer to this is that all moderm (SDRAM or newer) laptop memory modules feature timings data configured in what's known as a Serial Presence Detect (SPD) chip, which is set in such a way to comply with JEDEC memory standards. The result is that upon installation of two memory modules of varying CAS latency, the onboard laptop's BIOS checks and reads this SPD data, and configures the memory accordingly. In practise this means the slower memory module will always take priority hence the faster memory module will be forced to run at a slightly slower set of timings (of which CAS might be one of them)
An easy means to buying two laptop memory modules that have the same CAS latency (or simply SPD data) is to follow part 5 of the Laptop Memory Upgrades Guide.
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View other general laptop memory FAQ's
Can I install desktop memory inside my laptop?
Do I have to install identical pairs of memory modules to run in dual channel mode?
Can I mix memory modules with different CAS latency?
At what point does the cost of laptop memory outweigh the performance benefits?
Should I simply get the fastest frequency of memory modules for my laptop and not worry about their timings?
Can I buy PC2-8500 DDR2 SODIMM laptop memory modules for my DDR2 memory based laptop?
Will adding more laptop memory affect battery life?
Is there any logic in installing PC3-10600 DDR3 if my laptop states support for PC3-8500 DDR3?
Does my MacBook use standard or proprietary laptop memory?
Is it true that practically all laptops work with generic SODIMM's?
Just what exactly is dual channel memory?
Read the Laptop Memory Upgrades Guide to learn about all the aspects you should know when buying laptop memory...
...alternatively discover Where to buy 100% compatible SDRAM, DDR, DDR2 and DDR3 SODIMM memory.
PC3-10600 1333MHz DDR3 204-pin SODIMM Dual Channel kits
Looking for a PC3-10600 1333MHz DDR3 204-pin SODIMM Dual Channel kit for your laptop? Select the memory upgrade you require below and buy without the hassle!

4GB kit (2GBx2) PC3-10600 1333MHz DDR3 204-pin SODIMM laptop memory

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