Upgrading the ram

Hi, all

I have a Samsung RF511 laptop Core i7-2670QM.
I want to make a memory upgrade.
This device works with a clock of 1333MHz and CL 11.
My question:
I am in doubt whether I buy this model KVR1333D3S9/8 1333 MHz CL9 or
KVR16S11/8 1600MHz CL11 this.

In terms of compatibility Samgung with Kingston, is there a problem?
Thanks.

 

Most probably either will work. RAM modules contain a table of different settings. Usually, 1600MHz RAM will run at 1333MHz if the system doesn't support the faster speed, and most likely it will be CL9 at 1333MHz because the latencies are related to physical time.

Here's the SPD table for the Samsung RAM in my NP900X4C.

I would therefore tend to buy the 1600MHz module.

John

 

"Most probably either will work"??

So what would you suggest? Another manufacturer?

 

It it was my money I would buy the cheapest DDR3 1600MHz SODIMM from one of the better known manufacturers. The BIOS will read the SPD data for both modules and select the fastest timings supported by both. If this thread is correct, the i7-2670QM runs 1600MHz RAM at full speed so it's worth a try. And if it doesn't then it will use the RAM at 1333MHz with slightly lower latency settings.

John

 

i7-2670QM runs 1066/1333 MHz ( http://ark.intel.com/products/53469/Intel-Core-i7-2670QM-Processor-6M-Cache-up-to-3_10-GHz )
The clock is very likely to work, on a smaller timing, of course, as you said yourself. (1600 -> 1333)
but my doubt is CL, since I do not know if it works greater than CL9. How to know if it works?

Among manufacturers to Samsung Laptop: Kingston would be a good / bad choice?
Thanks a lot.

 

The Intel specs do not always give the full story because they relate to tested compatibility at the time the product was released and users discovered that faster RAM would work once it became available.

CL means Clock Latency which is the number of timing pulses it takes to perform various memory functions. The faster the clock then the shorter each pulse, so CL11 at 1600MHz is almost the same physical time as CL9 at 1333MHz. The CL values are stored in the RAM.

Kingston is a well-respected memory manufacturer. Crucial (Micron) is another popular brand.

John

 

^^^ Pretty much that except CL means CAS Latency (Column Address Strobe)