PC2700 (aka DDR333) on Pricewatch! Is it real? doubtful....
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  1. #1
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    PC2700 (aka DDR333) on Pricewatch! Is it real? doubtful....

    There is one vendor selling pc2700 on Pricewatch. The price of the ram seems legit for the speed, but the speed rating of the ram (7.5ns) seems unrealistic. Shouldn't it be more like 6ns or less? Let's hope it's just a typo on the part of the seller, and this stuff is for real.

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  2. #2
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    Micron has announced that they (Crucial) will be selling it now also. YeeHaw !

    Actually 7.5n sounds exactly right. 133MHz results in a period of 7.5188nS.


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  3. #3
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    BTW, period is the reciprocal of frequency so 1 divided by the freq gives the period.

    PS: Your sig is my one of my favorite lines from that movie.


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  4. #4
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    Thanx.


    I know about the period (yes I know that sounded sick...), and I don't want to sound insulting, but I'm referring to DDR that runs at 166Mhzx2 not 133x2. You seem like you may have been confused about the type/speed of ram I was referring to? Typically it's taken SDRAM rated at faster than 7.5ns to achieve high bus speeds (past 150Mhz or in this case 150x2). Why would it be any different with DDR? I have a stick of Tonicom pc166 CAS2 that's rated at 6ns (and according to the period, that would be 166), and I haven't seen any ram that reportedly overclocks as high and is rated at 7.5ns. So even if 7.5ns can reach 166, wouldn't that be pushing its limits? Why not just use faster memory chips? But again, perhaps the vendor made a typo in the specs, or they're bastards trying to sell pc2100 calling it pc2700.

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  5. #5
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    Oops - massive brain fart.

    That is a bit curious. Do you know if this new stuff runs at CAS2 or 2.5 or ?

    To tell you the truth, I am not sure what the speed rating measures these days. It is not purely access times. I would guess it's more like cycle time which should be 6nS for 166MHz as you said before.

    Sorry about that.


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  6. #6
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    All specs are the same as pc2100 except they call it pc2700. It's even rated at CAS2.5. It can't be DDR333... But I went to their website and they even have it on the frontpage as pc2700. It just can't be right since they're selling it for less than pc2400! Maybe I'll be giving them a call tomorrow...

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  7. #7
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    Taken from Electic Tech
    http://www.electic.com/cgi-bin/news/...31689651.shtml
    ...................


    DDR333 has hit the shelves of Micron. DDR333 is the next next speed step in the DDR SDRAM products family. With a 167 MHz clock, DDR333 provides a 333Mb/sec (PC2700 for x64 DIMMs) data rate and is also backwards compatible with DDR200 and DDR266. Micron will be providing further information and samples to their customers soon. Here are the specs of the part Micron will be dishing out:

    -167 MHz Clock, 333 MHz data rate
    -VDD = +2.5V 0.2V, VDDQ = +2.5V 0.2V
    -Bidirectional data strobe (DQS) transmitted/ received with data, i.e., source-synchronous data capture (x16 has two - one per byte)
    -Internal, pipelined double-data-rate (DDR) architecture; two data accesses per clock cycle
    -Differential clock inputs (CK and CK#)
    -Commands entered on each positive CK edge
    -DQS edge-aligned with data for READs; center-aligned with data for WRITEs
    -DLL to align DQ and DQS transitions with CK
    -Four internal banks for concurrent operation
    -Data mask (DM) for masking write data (x16 has two - one per byte)
    -Programmable burst lengths: 2, 4, or 8
    -Concurrent Auto Precharge option supported
    -Auto Refresh and Self Refresh Modes
    -FBGA package available
    -2.5V I/O (SSTL_2 compatible)
    -tRAS lockout ( tRAP = tRCD)
    -Backwards compatible with DDR200 and DDR266

  8. #8
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    Yep, I read that same press release which lead me to believe the stuff on Pricewatch isn't really pc2700. I'll be giving them a call today and we'll get this sorted out.

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  9. #9
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    Well I just got off the phone with Atacom, and they said it was the real deal. Although the woman I talked to didn't seem to reassure me that much. Their specs have to be wrong, it couldn't be 7.5ns though. Now if only I had $65...

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  10. #10
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    pas on it...remmeber this is Atacom you're dealing with...remember all the bad write-ups about them...

  11. #11
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    Micron has anounced their DDR33 chips avalable for imediat sale. That mean Crucial DDr333 for very cheap. They are generally the cheapest place for good DDR and free shipping to boot. Likely it is cas2.5, but I have not seen descent cas 2.5 DDR that can not run cas2 just fine. I plan on ordering some, even though I do not have a motherboard to fit it on (it is the cheapest of CPU, hard drive, and motherboard).

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  12. #12
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    I guess you don't need 6ns memory to run at 166/333. Someone has a link to a review of 7.5ns SDRAM that handles 170Mhz FSB easily. It's not DDR, but I'm guessing the memory timing to overclock ratio is the same for DDR and SDRAM. So apparently mfg's only had to up the quality of the ram chips themselves to reach this speed?

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