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Thread: Understanding RAM generations and RAM Timings

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    Smile Understanding RAM generations and RAM Timings

    This article is based on understanding RAM generations and RAM Timings, hope this will help newer curious members


    DDR & DDR II RAMk define kora hoi speed diye, sheita charao aro ekta jinish ache jeita diye RAMer performance bujha jai, sheita holo RAM Timings. RAM Timing 2-3-2-6-T1,3-4-4-8 or 2-2-2-5 hoi, tobe ei number gula joto kom hobe toto valo. DDR ba DDRII er por jei 3 digit er number thake sheita speed k represent kore, jemonDDR400 & DDRII667 jothakrome 400 Mhz & 667 MHz speed e kaj kore. KintuRAM er real clock holo jeita lekha thake sheitar ordhek, jemon DDR400 er actualspeed holo 200 MHz & DDRII667 er actual speed holo 333 MHz. Aro ek vabe RAMe define kora hoi, jemon PC3200 or PC2-5400, ei khetre PC or PC2 er porernumber ta Memory Bandwidth k represent kore, jemon PC3200 er memory bandwidthholo 3200 MB/s & PC22-5400 er memory bandwidth holo 5336 MB/s; r PC2 er 2tar mane holo DDR II. DDR400 or DDRII667 diye Memory Chip bujhai r PC3200 orPC2-5400 diye Memory Module bujhai.


    Memory Module erMaximum Transfer Rate janar jonno ei formula:-

    Maximum TheoreticalTransfer Rate = clock x number of bits / 8

    Jehetu DIMM modulemaximum transfer rate 64 Bits at a time, shehetu "Number of bits"equal to 64/8 = 8, so formula takey short kore:-

    Maximum TheoreticalTransfer Rate = clock x 8 kora jai.

    Example: DDR400 erReal Clock holo 200 x 8 = 1600 x Double Data = 3200 Mb/s
    Example: DDRII 667 erreal Clock holo 333.5 x 8 = 2668 x Double Data = 5336 Mb/s

    Usually PC3200 orPC2-5400 mane kintu j tara 3200 MB/s or 5336 MB/s Memory Bandwidth dibe takintu na, eitar mane hoilo ei RAM gula ei Memory Bandwidth Support kore. Jodiemon hoi j ekta PC4000 (DDR500) RAM emon ekta system e lagano holo jeitarMemory Bus hoilo 400 Mhz, tokhon r PC4000 module kintu 500 MHz e cholbe na,chole 400 MHz or 3200 MB/s Bandwidth. DDR500 kintu Overclock kore 400 MHzMemory Bus er System e 500 MHz speed e chalano jabe jodi ei dhoroner OCshongslishto Motherboard ta support kore. Shadharon user der jonno etotulu infoe jothshto, kintu Advanced User der jonno aro kichu info ache, jeitake bola hoiRAM Timings.




    RAM Timings for Advanced User

    Timing er karone sameMemory Chip er Module, difference performance dibe jodio tader speed &bandwidth same. Ei Timing ta holo ekta Memory Chip koto deri kore kono kajkorar jonno. RAM Timing er modhdhye shob cheye important holo CAS Latency (orCL or “access time”). Ei time take Clock Cycle bola hoi; jemon CL4 kono kajkorar jonno 4 Clock Cycle wait kore r CL3 wait kore 3 Clock Cycle. Jodi RAMsame o hoi tarporo CL3 er performance CL4 theke velo hobe, karon CL3, CL4 er tulonaitaratari Data Transfer korbe. RAM Timing er modhdhye jei number gula thake shobgulai Clock Cycle.

    CL: CAS Latency holoekta Command RAM e pathano ebong RAM shei kaj ta kora shuru kora er majkhanertime takey represent kore.

    tRCD: RAS to CAS Delayholo matrix e jei data store hoi tar activation of the line (Row AddressStrobe) ebong column (Column Address Strobe) er majkhaner shomoi ta.

    tRP: RAS Prechargeholo ekta data er access bondho kore arekta data er access open korar majkhanershomoi.

    tRAS: Active toPrecharge Delay holo shei shomoi ta jei shomoi ta RAM ekta command paoar porarekta command newar jonno ready hoi.

    CMD: Command Rateholo jokhon PC on korar por RAM jokhon activated hoi er por jokhon shey firstcommand ta receive kore tar majkhaner shomoi ta, usually ei ta 1 Cycle or 2Cycle hoiye thake, shehetu shob manufacturer ra RAM Timings er modhdhye ei infota dei na.


    Understanding RAM Timing

    Usually RAM er khetrekintu main e holo CS (Cas Latency), agey bolsi eita joto kom hobe toto fasterhobe, eita calculate korar jonno formula ta holo:-

    Timing = 1 / f

    Shei Onujayi DDR400CL 3 er base time holo 5 ns x 3 = 15 ns
    Shei Onujayi DDRII533 CL 4 er base time holo 3.75 ns x 4 = 15 ns
    Shei Onujayi DDRII667 CL 5 ER base time holo 3 ns x 5 = 15 ns
    Shei Onujayi DDRII800 CL 5 er base time holo 2.5 ns x 5 = 12.5 ns

    abaro mone koraidichchi j ei time joto kom hobe toto better.


    Difference Between DDR & DDRII

    DDR memories areofficially found in 266 MHz, 333 MHz and 400 MHz versions, while DDR2 memoriesare found in 400 MHz, 533 MHz, 667 MHz and 800 MHz versions. Both typestransfer two data per clock cycle. Because of that the listed clocks arenominal clocks, not real ones. To get the real clock divide the nominal clockby two. For example, DDR2-667 memory works in fact at 333 MHz.

    DDR2 memories have alower power consumption compared to DDR memories. DDR memories are fed with 2.5V while DDR2 memories are fed with 1.8 V.

    On DDR memories theresistive termination necessary for making the memory work is located on themotherboard, while on DDR2 memories this circuit is located inside the memorychip. This is one of the reasons why it is not possible to install DDR2memories on DDR sockets and vice-versa.

    DDR modules have 184contacts, while DDR2 modules have 240 contacts.

    On DDR memories the“CAS Latency” (CL) parameter – which is the time the memory delays delivering arequested data –, can be of 2, 2.5 or 3 clock cycles. On DDR2 memories CL canbe of 3, 4 or 5 clock cycles.

    On DDR2 memories,depending on the chip, there is an additional latency (AL) of 0, 1, 2, 3, 4 or5 clock cycles. So in a DDR2 memory with CL4 and AL1 the latency is 5.

    On DDR2 memories thewrite latency equals to the read latency (CL + AL) minus 1. Internally thecontroller inside DDR memories works preloading two data bits from the storagearea (task known as “prefetch”) while the controller inside DDR2 memories worksloading four bits in advance.



    DDR3
    DDR3 is the nextgeneration of Double Data Rate (DDR) Synchronous Dynamic Random Access Memory(SDRAM). It is an evolution of DDR and DDR2 memory technology that delivershigher speeds (at launch up to 1066MHz for Value RAM memory, beyond 1333MHz forExtreme memory), lower power consumption and heat dissipation.

    DDR3 memory chips andmodules are very different from DDR2. For example, DDR3 runs at a lower voltage(1.5V) than DDR2 (1.8V).

    Memory modules(Unbuffered, Registered, Small Outline DIMMs) have a special “key” or notch intheir connector. These keys must align with a key in the memory socket to allowthe module to be inserted. All DDR3 and DDR2 module types are keyeddifferently.



    It is difficult todistinguish a DDR3 motherboard from a DDR2 motherboard just by looking at it.Inserting a DDR3 DIMM into a DDR2 motherboard could damage the module, themotherboard, or both. To prevent such damage, the simplest process is to alignthe memory module and the socket, and visually check that the module “key”aligns perfectly with the socket key. You may have to turn over the memorymodule as the memory module direction may misalign even compatible socket andmodule keys.




    Code:
    Memory Memory Chip Module Module Module Bandwidth
    Speed Classification Classification Bandwidth Dual CH

    1066MHz DDR3-1066 PC3-8500 8.5GB/sec. 17.0GB/sec
    1333MHz DDR3-1333 PC3-10600 10.6GB/sec. 21.2GB/sec.
    1600MHz DDR3-1600 PC3-12800 12.8GB/sec. 25.6GB/sec.



    DDR3 memory chipswere internally redesigned to support higher speeds and lower powerconsumption, and dissipate less heat than DDR2. In addition, while DDR2 memorychips come in up to 2Gb chip sizes, DDR3 memory chips are specified by JEDEC togo up to 4Gb in capacity.

    JEDEC DDR3specifications define standard DDR3 CAS Latencies of 7, 9, and 10:

    -1066MHz DDR3: CAS 7(7-7-7)
    -1333MHz DDR3: CAS 9(9-9-9)
    -1600MHz DDR3: CAS 10 (10-10-10)

    Hope this helps ..............................................

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    Awesome Article Dude, Thanks a lot...

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    Kingston HyperX 8GB (2 x 4GB) (PC3 1600) $39.99 (6,500 Tk @ BINARY )
    Transcend JetRam 8GB(2 x 4GB) (PC3 1600)
    $44.99 (4,000 Tk @ BINARY)
    CORSAIR Vengeance 8GB(2 x 4GB) (PC3 1600) $43.99 (5,000 Tk @ BanglaGamer Shop)
    G.SKILL Ripjaws Series 8GB(2 x 4GB) (PC3 1600) $42.99 (5,000 Tk @ BanglaGamer Shop)

    Amar Q. holo, Internal Market aa Transcend JetRam price high then CORSAIR Vengeance & G.SKILL Ripjaws. Kano Bangladesh aaa price low?

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    Great post thanks.

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    Quote Originally Posted by ahasanali2005 View Post
    Kingston HyperX 8GB (2 x 4GB) (PC3 1600) $39.99 (6,500 Tk @ BINARY )
    Transcend JetRam 8GB(2 x 4GB) (PC3 1600)
    $44.99 (4,000 Tk @ BINARY)
    CORSAIR Vengeance 8GB(2 x 4GB) (PC3 1600) $43.99 (5,000 Tk @ BanglaGamer Shop)
    G.SKILL Ripjaws Series 8GB(2 x 4GB) (PC3 1600) $42.99 (5,000 Tk @ BanglaGamer Shop)

    Amar Q. holo, Internal Market aa Transcend JetRam price high then CORSAIR Vengeance & G.SKILL Ripjaws. Kano Bangladesh aaa price low?
    Transcend is basically a crap.

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    Quote Originally Posted by Vanguard View Post
    Transcend is basically a crap.
    ^ Exactly

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    Quote Originally Posted by Vanguard View Post
    Transcend is basically a crap.
    Try korar jonno anlam Transcend JM1600KLN-4G (2 x 4GB) (PC3 1600)

    Google aa search koraa dhaklam 3 type ar ram asaa ay Transcend aaa...

    1. Transcend Product P/N: JM1600KLN-4GK = Link
    2. Transcend Product P/N: TS512MLK64V6N = Link
    3. Transcend Product P/N: JM1600KLN-4G = Link

    Number "3" is our country ....

    CORSAIR Vengeance 8GB & G.SKILL Ripjaws Series 8GB = 5,000tk
    But agulo kono Guarantee ni... Taa hola Bangladesh aaa ke RAM buy koraa ji (4k)?
    Last edited by ahasanali2005; September 23rd, 2012 at 18:57.

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    Quote Originally Posted by ahasanali2005 View Post
    Try korar jonno anlam Transcend JM1600KLN-4G (2 x 4GB) (PC3 1600)

    Google aa search koraa dhaklam 3 type ar ram asaa ay Transcend aaa...

    1. Transcend Product P/N: JM1600KLN-4GK = Link
    2. Transcend Product P/N: TS512MLK64V6N = Link
    3. Transcend Product P/N: JM1600KLN-4G = Link

    Number "3" is our country ....

    CORSAIR Vengeance 8GB & G.SKILL Ripjaws Series 8GB = 5,000tk
    But agulo kono Guarantee ni... Taa hola Bangladesh aaa ke RAM buy koraa ji (4k)?
    I would definitely prefer TwinMOS Twister or ADATA XPG

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    Quote Originally Posted by Vanguard View Post
    I would definitely prefer TwinMOS Twister or ADATA XPG
    TwinMOS Twister or ADATA XPG koi PAboo, Uttara ta ni..

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    Quote Originally Posted by ahasanali2005 View Post
    TwinMOS Twister or ADATA XPG koi PAboo, Uttara ta ni..
    1st one is in ONIX, 2nd one is in Binary Logic. both in IDB

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    Quote Originally Posted by Vanguard View Post
    1st one is in ONIX, 2nd one is in Binary Logic. both in IDB
    Uttara found but price too 8GB ar chaa onak basee
    Adata xpg 2000bus 6800 price for 2 x 2 4gb ram...

    Price ke bolta paren...? Ar IDB asla apnara call koraa Fan taa niaa asboo....
    Last edited by ahasanali2005; September 25th, 2012 at 10:11.

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    twinmos twister 2000 bus 2x2GB is 3,600/=

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    Quote Originally Posted by Vanguard View Post
    twinmos twister 2000 bus 2x2GB is 3,600/=
    GIGABYTE GA-B75M-D3V aa ke 2,000 BUS support korbaa?

    ***To support XMP memory, you must install an Intel 22nm CPU.

    What is XMP memory?
    Last edited by ahasanali2005; September 25th, 2012 at 14:17.

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    Quote Originally Posted by ahasanali2005 View Post
    GIGABYTE GA-B75M-D3V aa ke 2,000 BUS support korbaa?
    no support korbe na karon giabyte er motherboard ta maximum 1600 BUS support kore ...jodi apni 2000 BUS use korte chan tahole
    MSI B75MA-P45 motherboard ta kinen .
    XMP- eXtreme Memory Profile
    XMP is an internal profile stored within the memory modules . XMP allows your BIOS to automatically configure the CPU, memory speed and timing for easy overclock solutions to maximize the performance of your memory modules. it means that with the support of XMP you can easily overclock your memory module to get maximum performance from your memory module
    Last edited by HAWX; September 25th, 2012 at 15:06.

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    Quote Originally Posted by HAWX View Post
    no support korbe na karon giabyte er motherboard ta maximum 1600 BUS support kore ...jodi apni 2000 BUS use korte chan tahole
    MSI B75MA-P45 motherboard ta kinen .
    XMP- eXtreme Memory Profile
    XMP is an internal profile stored within the memory modules . XMP allows your BIOS to automatically configure the CPU, memory speed and timing for easy overclock solutions to maximize the performance of your memory modules. it means that with the support of XMP you can easily overclock your memory module to get maximum performance from your memory module
    HAWX was just spot on!!! Great response!

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    Quote Originally Posted by Vanguard View Post
    HAWX was just spot on!!! Great response!
    thanks bhaia

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    (1) G.SKILL Sniper 8GB (2 x 4GB) F3-12800CL9D-8GBSR1

    (2) G.SKILL Sniper 8GB (2 x 4GB) F3-12800CL9D-8GBSR


    Different only Low Voltage = (1) Voltage 1.35V / (2) Voltage 1.5V
    Different
    money is = $5 US / 700tk.

    My M.B is GIGABYTE GA-B75M-D3V so if use 1st one(Voltage 1.35V) any problem???


    Name:  20-231-479-Z05.jpg
Views: 482
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    Vanguard bro, where are u?
    Last edited by ahasanali2005; October 3rd, 2012 at 00:00.

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    @ahasanali2005 no problem

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    Today im gonna discuss how to calculate raw ram timings and choosing the perfect rams

    As a general rule, lower is better. Memory kits on the market will vary in their subtimings – you can purchase DDR3-1333 9-9-9, DDR3-1600 11-11-11 all the way up to DDR3-3000 12-14-14. The question then becomes whether you want to decide between two similar kits. Imagine the following kits:


    DDR3-1333 9-9-9
    DDR3-1600 10-10-10
    DDR3-1866 11-11-11


    In a lot of scenarios, an enthusiast may take one look at these numbers and tell a user that these kits are equivalent – boosting the memory speed but increasing the sub-timing latencies causes similar performance. There is one way to determine whether a kit might be better than another, and that is to look at the calculable latency of the kit.


    Calculating this value is a simple enough formula:
    2000 x (CL / Speed ) = Latency in nanoseconds (ns)


    Thus for the three kits above:
    DDR3-1333 9-9-9 has a latency of 13.5 ns
    DDR3-1600 10-10-10 has a latency of 12.5 ns
    DDR3-1866 11-11-11 has a latency of 11.79 ns


    This latency essentially tells us which kit is fastest at non-sequential reads. Non-sequential reads are important in a lot of variable scenarios, such as video games whereby the user could perform one of a billion different actions and as such different elements of the memory have to be loaded.
    The downside of this test is that it does not take into account consecutive reads. When dealing with conversion, video editing, or anything that requires a large dataset to be read sequentially, we have to look at how long reads are processed.


    The way to check this with DDR3 is as follows:
    Cycle time in ns = 1000 / (Memory Speed / 2)
    Bit time in ns = 1000 / Memory Speed


    The time to read a single word of data (word is a technical term meaning 64 bits) is given by the Cycle Time multiplied by the CL. The time to read eight words is the Cycle Time multiplied by the CL then add seven lots of Bit Time. Let us go through the memory kits above with this method.


    DDR3-1333 9-9-9 has a Cycle Time of 1.5 ns and a Bit Time of 0.75 ns
    The time to read one word is 1.5*9 = 13.5 ns
    The time to read eight words is 13.5 + 7 * 0.75 = 18.75 ns


    DDR3-1600 10-10-10 has a Cycle Time of 1.25 ns and a Bit Time of 0.625 ns
    The time to read one word is 1.25 * 10 = 12.5 ns
    The time to read eight words is 12.5 + 7 * 0.625 = 16.875 ns


    DDR3-1866 11-11-11 has a Cycle Time of 1.07 ns and a Bit Time of 0.536 ns
    The time to read one word is 1.08 * 11 = 11.79 ns
    The time to read eight words is 11.79 + 7 * 0.536 = 15.54 ns


    In both the sort reads and long reads, DDR3-1866 11-11-11 wins out of the three kits. But what if it was not so clear cut?


    The following kits have the following timings and results:
    DDR3-2000 at 9-9-9 reads one word in 9 ns and eight words in 12.5 ns
    DDR3-1666 at 7-7-7 reads one word in 8.75 ns and eight words in 13.125 ns


    This means that the DDR3-2000 kit should be better for longer reading workloads, whereas the DDR3-1666 kit should be better for random reads.


    Command Rate


    This funny little number at the end is often quoted as 1T or 2T depending on the memory kit, how many modules are installed, and the motherboard settings. The command rate is the address and command decode latency, essentially the delay between accessing and decoding data - this delay allows the memory time to be accessed without errors.
    In an ideal world there should be no latency, but in performance tests using a setting of 1T is shown to be quicker than 2T for synthetic benchmarks. Whether a user can feel the difference (in essence it adjusts peak bandwidth as well) is debatable, but the slower the kit as standard, the more of a difference will be felt between the two options. The argument also exists that a setting of 2T will allow the kit to be overclocked higher.
    By default 2T is usually selected for memory kits that contain more modules - on the off chance that one module of the kit cannot perform at the stated speed using 1T timings, defaulting to 2T will make sure more modules pass the binning process. But again, lower is always better and if that is by default, its simply Wow!





    Courtesy: Ian Cutress on 10/18/2012 12:00:00 PM

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    banglagamer shop kothai?????????????????????????transcend keno crap?????????????????

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