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Why won't my RAM post at CAS3?

Discussion in 'Memory' started by HangTime, 17 Jan 2006.

  1. HangTime

    Man of Honour

    Joined: 25 Oct 2002

    Posts: 28,429

    Location: Hampshire

    Bit of a strange one here. I was doing some testing last night of high FSB on my ancient Twinmos PC3200 2*512meg kit. As I was going for FSBs in excess of 250mhz (DDR500), I was trying CAS3 to start with to see what she could do. However no matter how loose I made the other timings, I couldn't get the system to POST.

    Now this is where it gets a bit weird. The system will boot up fine using the same settings, but at CAS2.5. This doesn't make any sense to me, why would it run Windows at CAS2.5, but not even POST at CAS3? Surely it should be the other way round if anything, with lower latency proving more unstable/usable.
     
  2. loltim

    Capodecina

    Joined: 21 Oct 2002

    Posts: 14,605

    Location: Wellington, NZ

    Some RAM won't do CL3, BH5 doesn't like it for example.

    Depends on the chipset, too.
     
  3. HangTime

    Man of Honour

    Joined: 25 Oct 2002

    Posts: 28,429

    Location: Hampshire

    Is there any tool which can query my RAM to find out what chips it's using? Twinmos from that period is often bh5/bh6/ch5/ch6 I believe.

    I tried looking on the chips last time they were out of the pc, but the writing is so small, and contrast so poor that I couldn't make out what it said with my crappy eyesight.
     
  4. loltim

    Capodecina

    Joined: 21 Oct 2002

    Posts: 14,605

    Location: Wellington, NZ

    You can't tell which specific ones they are just by looking at them but you can (I think) tell which manufacturer made them.

    Winbonds have the two circle on the actual chip. If its a TwinMOS own brand chip I don't think the circles are present.

    [​IMG]

    CPU-Z can sometimes tell you the manufactuer, mine says "CCC" which is a Samsung IC.
     
    Last edited: 17 Jan 2006