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Upgrade RAM from 4GB to 8 GB

Hello,

My Laptop Model is: NP 350-E5C-S01-HK (Samsung Hong Kong)
It has 4GB DDR3 RAM at 1600 MHZ (as per specification), however DRAM frequency as per CPU-Z software is around 798 MHZ (why its less?)- CAS latency is 11.0 clocks, it is PCR3-12800, under SPD heading of CPU-Z software there are timing tables shown for RAM as JEDEC#4, JEDEC#5, JEDEC#6, JEDEC#7 (what does that mean? why there are 4 different timings? please explain)-

Now please tell me which RAM should i buy, better if you can tell the model, also i dont know mine is 4GBx1 or 1GBx4 configuration, how to figure that out? does it make any difference, i have shortlisted 2 RAM one is Gskill value ram 4GB x1 and another is Corsair Vengeance 4GB 1600Mhz DDR3 with 1x4GB configuration, which will be better for me? should i look into any further information and specification to decide on which RAM to upgrade? Please help me out its all confusing for me as i don't have any technical knowledge.

thank you
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  1. Best answer
    There is a link here explaining the JEDEC timings http://forum-en.msi.com/faq/article/ddr3-memory-timings-explained

    Your DDR3 ram is rated to run 1600MHz however it dual channel ram so the speed of each channel is 800MHZ (x2 is 1600MHz).

    On the underside of the laptop there will be various panels with a screw holding it on. Under one of them will be your RAM expansion slots. In CPU-z under the SPD tab you can cycle through the available RAM slots to see what you have installed in each slot. Hope this helps.
  2. Thank You, please note I am from small town and here there is no technical help, so I have to order RAM at my risk, if it doesn't work well with my existing RAM i will lose money- hence i want to be sure before i order it online

    Memory Configuration- What is mine, is it 2X 2 or 1X 4 or 4X 1- and will that matter if i install a different configuration from what is already there
    Max Bandwidth is - PC3-12800 (800 mhz)
    CAS Latency- 8-9-10-11

    My question is:
    A) What specs should be must considered before i order so that it is compatible & works best with my existing RAM
    B) Which configuration will be best for me 2X 2 or 1X 4 or 4X 1- what is difference between all these btw
    C) With similar specs which is better brand corsair (cheaper here) or Gskill (8 $/ 500 INR more here)


    zink1701 said:
    There is a link here explaining the JEDEC timings http://forum-en.msi.com/faq/article/ddr3-memory-timings-explained

    Your DDR3 ram is rated to run 1600MHz however it dual channel ram so the speed of each channel is 800MHZ (x2 is 1600MHz).

    On the underside of the laptop there will be various panels with a screw holding it on. Under one of them will be your RAM expansion slots. In CPU-z under the SPD tab you can cycle through the available RAM slots to see what you have installed in each slot. Hope this helps.
  3. RAM
    Memory slots
    Total memory slots 4
    Used memory slots 1
    Free memory slots 3
    Memory
    Type DDR3
    Size 4096 MBytes
    Channels # Single
    DRAM Frequency 798.3 MHz
    CAS# Latency (CL) 11 clocks
    RAS# to CAS# Delay (tRCD) 11 clocks
    RAS# Precharge (tRP) 11 clocks
    Cycle Time (tRAS) 28 clocks
    Command Rate (CR) 1T
    Physical Memory
    Memory Usage 40 %
    Total Physical 3.89 GB
    Available Physical 2.33 GB
    Total Virtual 7.39 GB
    Available Virtual 5.57 GB
    SPD
    Number Of SPD Modules 1
    Slot #1
    Type DDR3
    Size 4096 MBytes
    Manufacturer Samsung
    Max Bandwidth PC3-12800 (800 MHz)
    Part Number M471B5273EB0-CK0
    Serial Number 96BDA843
    Week/year 46 / 12
    JEDEC #7
    Frequency 838.1 MHz
    CAS# Latency 11.0
    RAS# To CAS# 11
    RAS# Precharge 11
    tRAS 30
    tRC 41
    Voltage 1.500 V
    JEDEC #6
    Frequency 761.9 MHz
    CAS# Latency 10.0
    RAS# To CAS# 10
    RAS# Precharge 10
    tRAS 27
    tRC 37
    Voltage 1.500 V
    JEDEC #5
    Frequency 685.7 MHz
    CAS# Latency 9.0
    RAS# To CAS# 9
    RAS# Precharge 9
    tRAS 24
    tRC 33
    Voltage 1.500 V
    JEDEC #4
    Frequency 609.5 MHz
    CAS# Latency 8.0
    RAS# To CAS# 8
    RAS# Precharge 8
    tRAS 22
    tRC 30
    Voltage 1.500 V
    JEDEC #3
    Frequency 533.3 MHz
    CAS# Latency 7.0
    RAS# To CAS# 7
    RAS# Precharge 7
    tRAS 19
    tRC 26
    Voltage 1.500 V
    JEDEC #2
    Frequency 457.1 MHz
    CAS# Latency 6.0
    RAS# To CAS# 6
    RAS# Precharge 6
    tRAS 16
    tRC 22
    Voltage 1.500 V
    JEDEC #1
    Frequency 381.0 MHz
    CAS# Latency 5.0
    RAS# To CAS# 5
    RAS# Precharge 5
    tRAS 14
    tRC 19
    Voltage 1.500 V
  4. Intel HM76 (Panther Point)- Motherboard
  5. Just applied new RAM which i had ordered with my existing Samsung RAM, both are working in Dual mode (CPU-Z)

    All others details checked are exactly the same Windows experience index up to 7.5 from 5.9 (RAM)

    Hopefully the new RAM is welcomed by my laptop :-)
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