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RAM upgrade - timing?

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Last response: in Memory
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June 2, 2012 11:20:42 PM

I'm thinking about upgrading my Win-7 64-bit machine from 4GB to 8GB. Right now slots 1 & 3 are occupied, slots 2 & 4 are empty. I understand memory speed but I'm not sure how to interpret timing numbers from my CPU-Z screenshot. Will the following memory work -

G.SKILL NS 2GB 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL9S-2GBNS

Cas Latency: 9
Voltage: 1.5V
Timing: 9-9-9-24
ECC: No
Model #: F3-10666CL9S-2GBNS

With the existing memory:

Max Bandwidth - PC3-10700 (667 MHz)
DRAM Freq. 533.3 MHz
CL at 533 MHz - 7.0
CL at 686 MHz - 9.0

More about : ram upgrade timing

a c 251 } Memory
June 3, 2012 12:56:00 AM

For different ram to work together, it is best that most things are the same such as voltage and timings. Both those have cl9 at 1333MHz what about voltage?
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June 3, 2012 12:57:33 AM

Yep...the ram IS compatible with what you have...REMEMBER...DDR means "dual data rate" which means two cycles to read data..so that 667/686 is basically 1333 ram and with a CL of 9....should be 9 9 9 and the 24 should be checked in the bios.

The two ram sets should be absolutely compatible but you should check your bios to see that all 4 sticks or ram are being detected correctly and check the memory timings for each stick...You didn't mention what motherboard you are running...but should be some sort of mem/ram timings option in the BIOS.

Hope that helped a bit!
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June 3, 2012 1:06:09 AM

Thanks guys. I'm not sure how to check the timing for each stick.

Motherboard is Acer EG43M
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a c 251 } Memory
June 3, 2012 1:10:22 AM

The only thing that can be trouble some is if one set is 1.5 volts and the other 1.65 volts!
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June 3, 2012 1:18:33 AM

Just exited from the BIOS. Couldn't see where to set timing or voltage, can you advise? Thanks!
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a c 251 } Memory
June 3, 2012 1:35:51 AM

Voltage is under ram settings but you might have to set manual mode to get to see them. You can as well take a look at one of your modules should be specified on there.
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June 3, 2012 1:53:50 AM

Actually CPU-Z says the voltage is 1.5, which matches the new memory specs.

Only doubt was that CAS# Latency (again according to CPU-Z) ranges from a low of 6.0 at 457 MHz to a high of 9.0 at 686 MHz.

So the new memory, being 9-9-9-24 should be OK?
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Best solution

a c 251 } Memory
June 3, 2012 1:55:27 AM

Yes it should work The 686 is supposed to be 667 which makes it DDR3 1333MHZ.
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June 3, 2012 2:00:46 AM

Many thanks, I'll go ahead and order the memory.
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June 10, 2012 12:34:41 AM

Best answer selected by TorontoListener.
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