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Thread: RAM timings

  1. #1
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    Exclamation RAM timings

    This topic was originally posted by DesertFox in WCG-BD forum long ago. I saved it. Probably it will help all of us again, especially for the newer Bangla Gamer memebers.



    DDR & DDR II RAM k define kora hoi speed diye, sheita charao aro ekta jinish ache jeita diye RAM er 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 DDR II er por jei 3 digit er number thake sheita speed k represent kore, jemon DDR400 & DDRII667 jothakrome 400 Mhz & 667 MHz speed e kaj kore. Kintu RAM er real clock holo jeita lekha thake sheitar ordhek, jemon DDR400 er actual speed holo 200 MHz & DDRII667 er actual speed holo 333 MHz. Aro ek vabe RAM e define kora hoi, jemon PC3200 or PC2-5400, ei khetre PC or PC2 er porer number ta Memory Bandwidth k represent kore, jemon PC3200 er memory bandwidth holo 3200 MB/s & PC22-5400 er memory bandwidth holo 5336 MB/s; r PC2 er 2 tar mane holo DDR II. DDR400 or DDRII667 diye Memory Chip bujhai r PC3200 or PC2-5400 diye Memory Module bujhai.

    Memory Module er Maximum Transfer Rate janar jonno ei formula:-

    Maximum Theoretical Transfer Rate = clock x number of bits / 8

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

    Maximum Theoretical Transfer Rate = clock x 8 kora jai.

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

    Usually PC3200 or PC2-5400 mane kintu j tara 3200 MB/s or 5336 MB/s Memory Bandwidth dibe ta kintu na, eitar mane hoilo ei RAM gula ei Memory Bandwidth Support kore. Jodi emon hoi j ekta PC4000 (DDR500) RAM emon ekta system e lagano holo jeitar Memory 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 MHz Memory Bus er System e 500 MHz speed e chalano jabe jodi ei dhoroner OC shongslishto Motherboard ta support kore. Shadharon user der jonno etotulu info e jothshto, kintu Advanced User der jonno aro kichu info ache, jeitake bola hoi RAM Timings.

    _________________


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

    CL: CAS Latency holo ekta Command RAM e pathano ebong RAM shei kaj ta kora shuru kora er majkhaner time takey represent kore.

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

    tRP: RAS Precharge holo ekta data er access bondho kore arekta data er access open korar majkhaner shomoi.

    tRAS: Active to Precharge Delay holo shei shomoi ta jei shomoi ta RAM ekta command paoar por arekta command newar jonno ready hoi.

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

    _________________



    Understanding RAM Timing
    Usually RAM er khetre kintu main e holo CS (Cas Latency), agey bolsi eita joto kom hobe toto faster hobe, eita calculate korar jonno formula ta holo:-

    Timing = 1 / f

    Shei Onujayi DDR400 CL 3 er base time holo 5 ns x 3 = 15 ns
    Shei Onujayi DDRII 533 CL 4 er base time holo 3.75 ns x 4 = 15 ns
    Shei Onujayi DDRII 667 CL 5 ER base time holo 3 ns x 5 = 15 ns
    Shei Onujayi DDRII 800 CL 5 er base time holo 2.5 ns x 5 = 12.5 ns

    abaro mone korai dichchi j ei time joto kom hobe toto better.

    _________________



    Difference Between DDR & DDRII
    DDR memories are officially found in 266 MHz, 333 MHz and 400 MHz versions, while DDR2 memories are found in 400 MHz, 533 MHz, 667 MHz and 800 MHz versions. Both types transfer two data per clock cycle. Because of that the listed clocks are nominal clocks, not real ones. To get the real clock divide the nominal clock by two. For example, DDR2-667 memory works in fact at 333 MHz.

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

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

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

    On DDR memories the “CAS Latency” (CL) parameter – which is the time the memory delays delivering a requested data –, can be of 2, 2.5 or 3 clock cycles. On DDR2 memories CL can be 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 or 5 clock cycles. So in a DDR2 memory with CL4 and AL1 the latency is 5.

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

    _________________


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

    DDR3 memory chips and modules 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 in their connector. These keys must align with a key in the memory socket to allow the module to be inserted. All DDR3 and DDR2 module types are keyed differently.



    It is difficult to distinguish a DDR3 motherboard from a DDR2 motherboard just by looking at it. Inserting a DDR3 DIMM into a DDR2 motherboard could damage the module, the motherboard, or both. To prevent such damage, the simplest process is to align the 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 memory module as the memory module direction may misalign even compatible socket and module 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 chips were internally redesigned to support higher speeds and lower power consumption, and dissipate less heat than DDR2. In addition, while DDR2 memory chips come in up to 2Gb chip sizes, DDR3 memory chips are specified by JEDEC to go up to 4Gb in capacity.

    JEDEC DDR3 specifications 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)

  2. #2
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    Default Re: RAM timings

    I am adding one more thing; The Transcend is probably the best RAM in the market which is comparatively cheap. Here is the price. [The price of electronic peripherals may waver very fast within a short time in markets]

    DDR2 800bus 1GB RAM price 1,700/=
    DDR2 667bus 1GB RAM price 1,400/=
    DDR2 667bus 512MB RAM price 700/=

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    Default Re: RAM timings

    vai matha betha start hoya gese porte jaya. tablet dao
    Speed is like ADDICTION.....

  4. #4

    Default Re: RAM timings

    I got the Transcend aXe RAM 2 x 1 GB DDR2 1066 ... did I do the right thing by not getting a 2 x 2 GB DDR2 800? The price would have been the same.

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    Default Re: RAM timings

    tumi right kaj tai korso. 4gb normal 800 ram r theke aXe ram r 2gb onek better. performance o chorom. good choice of urs
    Speed is like ADDICTION.....

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    Default Re: RAM timings

    Where did you buy that??? I asked the price of 1x2 GB DDR2 1066 and the sellsmen of UCC and Smart told me that the price would be 11,000/=

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    Default Re: RAM timings

    Akta thanks-o amake keu dilo na! DesertFox bhaireo dio.

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    Default Re: RAM timings

    vul bolla UCC te 4gb aXe ram r price 14000 so 2g r dam kivabe 11000 hoy. i think its about 9000tk.
    Speed is like ADDICTION.....

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    Default Re: RAM timings

    Quote Originally Posted by @spret View Post
    vul bolla UCC te 4gb aXe ram r price 14000 so 2g r dam kivabe 11000 hoy. i think its about 9000tk.
    2GB kit costs 8grand (8000/=) m8...

  10. #10
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    Default Re: RAM timings

    dorkar nai amar AXE/Fax RAM er!!! 8,000tka diye ami 6 GB 800bus RAM kinte parbo.

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    Default Re: RAM timings

    Quote Originally Posted by Tian View Post
    dorkar nai amar AXE/Fax RAM er!!! 8,000tka diye ami 6 GB 800bus RAM kinte parbo.
    6GB 800bus ram will cost around 9900/=!!! & aXe RAM is way better then normal ram... the pipeline is better & the bandwith is nearly double.... 2GB kit is pricey... but u can get 4gb kit in around 13Grand but it's still pricy...

  12. #12

    Default Re: RAM timings

    Quote Originally Posted by Tian View Post
    Where did you buy that??? I asked the price of 1x2 GB DDR2 1066 and the sellsmen of UCC and Smart told me that the price would be 11,000/=
    Thank you Tian!!!!!

    It took me Tk. 8000 and I got it from UCC... maybe they were trying to rip you off or sumthing...

    But the reason I got it was that, well firstly... the box looked really nice , but I was assured that I was taking something reliable and something with good performance. If I didn't buy this, I would have looked for some CORSAIR ones.

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    Default Re: RAM timings

    in BD?? corsair?? ase ? IDB te?

    Hunt for Tiberium.... dont get infected by it.. its the Healer

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    Default Re: RAM timings

    onek kisui porlam... tobe asol kotha holo .... jar Transcend er aXe RAM ase uni ekbar kosto kore memory chip gular brand ta dekhe. tahole dharona hoe jabeota bhalo naki kharap..... lol

    amar ar kisui bolar nai

  15. #15
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    Default Re: RAM timings

    Quote Originally Posted by CHR.Neon View Post
    onek kisui porlam... tobe asol kotha holo .... jar Transcend er aXe RAM ase uni ekbar kosto kore memory chip gular brand ta dekhe. tahole dharona hoe jabeota bhalo naki kharap..... lol

    amar ar kisui bolar nai
    aXe RAM's chip is from Transcend but it's not the normal chip that u usually found in normal ram... it's Transcend's Extreme series chip....

  16. #16

    Default Re: RAM timings

    Quote Originally Posted by CHR.Satiator View Post
    in BD?? corsair?? ase ? IDB te?
    Lol, no... I said I would have looked for it.

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    Default Re: RAM timings

    Quote Originally Posted by coldfire7 View Post
    aXe RAM's chip is from Transcend but it's not the normal chip that u usually found in normal ram... it's Transcend's Extreme series chip....
    its a wrong iformation. i also have 2 aXe ran from transcend. the chip of this ram in innocliops. its not so good as you think.... sorry to say this but its ture...

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    Default Re: RAM timings

    Quote Originally Posted by CHR.Neon View Post
    its a wrong iformation. i also have 2 aXe ran from transcend. the chip of this ram in innocliops. its not so good as you think.... sorry to say this but its ture...
    I didn't say that it's very good but it's way better then normal rams from transcend or twinmos... but if u will compare it to brands like cosair, ocz, crucial then it sucks... even it's worst then corsair's cheap priced xms2 800MHz ram...

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    Default Re: RAM timings

    Transcend normal RAM gula theke apnar kena AXE RAM 1-2% er beshi performence dibe na.

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    Default Re: RAM timings

    there seems to be some confusion here?

    RAM timings will only impact a very few applications(mostly server applicatios, which are more bandwidth hungry). General applications will at most, see 1% to 5% differences between 3-3-3-9 and 5-5-5-15 timings

    however, the main bottleneck is the Northbridge of the motherboards. hence, decreasing the tRD latency (the latency of the MCH, in short) will yield much better performances rather than tweaking the RAM timings

    and as to the chips the axeram uses, its micron D9GMH, which have been known to have a high tolerance for voltage, but is weak in terms of latency and reliability when compared to higher performance competitors for around the same price (but not in BD i think)

    hope this clears things up

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