anyone know why ASP lists my dual 1.25 RAM as pc133?

peaceful billypeaceful billy
Posted:
in Current Mac Hardware edited January 2014
hi



i bought a dual 1.25 last year with 512 MB RAM from apple and then added 1.5 GB RAM from crucial. both were obviously pc2700 when ordered.



but when i open the apple system profiler window in OS 9, it says my RAM is 2 GB pc133. it lists each individual stick as DDR SDRAM.



is this just a residual limit of OS 9 - to not understand anything beyond PC133?



i've searched here and not found anything.



are other dual 1.25/dual 1 gig MDD owners seeing the same thing?



thanks

Comments

  • Reply 1 of 10
    akacakac Posts: 512member
    DDR 2700 RAM IS PC 133/167. It just uses both the rising and falling sides - eg DDR.
  • Reply 2 of 10
    peaceful billypeaceful billy Posts: 26member
    Akac



    so, when you say it is pc133/167 - are they the same thing?



    i'd expect the ram in my dual 867 to be labelled as pc133 (and it is), but the ram in the dual 1.25 to be labelled pc167 since it has a 167 mhz bus.



    is that right? or is all of it (pc2100 and pc2700) just DDR pc133 ram, regardless? if so, what is the difference between them? why even have two versions?



    thanks
  • Reply 3 of 10
    wmfwmf Posts: 1,164member
    PC133 is not the same as PC2100 or PC2700. ASP is probably just wrong.
  • Reply 4 of 10
    smithjoelsmithjoel Posts: 240member
    I bet ASP for OS 9 hasn't been updated for DDR.



    No big deal, it IS PC2700



    [ 02-14-2003: Message edited by: smithjoel ]</p>
  • Reply 5 of 10
    peaceful billypeaceful billy Posts: 26member
    thanks all



    that's what i thought. just wanted to make sure.



    cheers
  • Reply 6 of 10
    g-newsg-news Posts: 1,107member
    how about just booting into OS X (yes, you actually can do that) and check with the ASP there?
  • Reply 7 of 10
    peaceful billypeaceful billy Posts: 26member
    G-News



    i did, but the 'memory overview' doesn't list the speed of the ram. just that it is ddr.



    is there somewhere else i can look in X?
  • Reply 8 of 10
    akacakac Posts: 512member
    [quote]Originally posted by wmf:

    <strong>PC133 is not the same as PC2100 or PC2700. ASP is probably just wrong.</strong><hr></blockquote>



    No, its not wrong. You are. If you notice, it says PC133 DDR. That means it recognizes that its DDR RAM.



    PC2100 is PC133 RAM, just DDR. Its measured differently however, but its core is still PC 133.



    Here is a post I've read that explains it:



    [quote]PC100 and PC133 are the bus speeds these types of memory have be rated to

    run at

    i.e. 100Mhz and 133Mhz respectively.



    PC2100 refers to the data transfer speed(max bandwidth).

    It's a different spec due to marketing competition between RDRAM and

    DDR-SDRAM.



    essentially it's DDR PC133 so it's roughly 2.6 times the speed of PC100 not

    21 times.



    PC2100 ~ 8(8 bytes are transferred each transfer) * 2 (2 transfers each

    cycle (Double Data Rate)) * 133 (133 million cycles per second)



    really it's PC2133 but no one really quibbles about that.



    PC133 ~ 8 * 1 * 133 = PC1066



    clear as mud <hr></blockquote>
  • Reply 9 of 10
    wmfwmf Posts: 1,164member
    PC2100 is 133MHz DDR, but PC133 does not just mean 133MHz, it specifically means SDR 133MHz.
  • Reply 10 of 10
    peaceful billypeaceful billy Posts: 26member
    ok



    but is pc2700 supposed to be listed as pc133? that's what's in (or supposed to be in) my dual 1.25.



    it would seem to me that PC2700 ram would be listed as pc167 and then each stick would be labelled DDR. i mean, if PC2700 is pc133 - just like pc2100, then what is the difference between the two (pc2700 and pc2100)?
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