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Latency vs Clock

Discussion in 'Motherboards & Memory' started by xvi, Dec 29, 2006.

  1. xvi

    xvi

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    Some people are a fan of latency while other people are a fan of clock speeds. Some people say you should overclock until your CPU hits it's limit and then lower your timings over that.
    What would you recommend?

    And also, what's better? Higher clock or 1T?
     
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  2. stevorob

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    Do you game or run benchies 24/7?

    But yes, overclock your cpu to the max while loosening timings so memory isn't hindering the overclock. Then adjust memory and find a happy medium.
     
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  3. Namslas90 New Member

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    The bottleneck is the sempron CPU. Keep the Mem @ 2T loosen the timmigs and see what the sempron will do!!
     
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  4. stevorob

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    And drop the divider. We need some more info on your mobo.

    Throw up some cpu-z screenies. One for the CPU and one of the memory info.
     
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  5. xvi

    xvi

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    The Sempron won't have anything over ~240 by design (and the multiplier is locked). I can run about 235-237 stable. Like I said, it's designed to cut out around 240 so there isn't much I can do there.

    I'm talking to some guys now about the limit. Apparently the FSB limit isn't there. Trying settings now.

    Edit: I lied about the locking. See below.
     
    Last edited: Jan 6, 2007
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  6. mortal New Member

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    That is a question.

    To buy BH-5 or TCCD?

    I think clock is a bit better, but afcourse od AMD sck. 939 and older. On ddr2 that does not matter a lot
     
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  7. largon

    largon

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    K8 overclocking priorities:
    1. CPU clock speed
    2. memory latency
    3. memory bandwidth

    [fact]
    Memory bandwidth north of what PC3200 offers means nothing outside bandwidth benchmarks and certain highly memory dependant applications.
    [/fact]

    K8 is somewhat sensitive to memory latency. For example gaming performance on low resolutions will suffer due to high latency. Real world gaming with normal-high resolutions on the other hand will not be set back by higher latencies because in these cases GPU is the bottleneck.

    Memory latency can be lowered by:
    - lowering the amount of latency cycles (tCL, tRCD, tRP, etc.)
    - raising frequency (higher frequency = shorter clock cycle = shorter latency cycle)

    Keep in mind upping the RAM frequency will decrease latency.
    For example:
    TCCD @ 300MHz tCL2.5 is latency-wise equivalent to BH-5 @ 240MHz tCL2.
     
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  8. cdawall

    cdawall where the hell are my stars

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    mine runs better with low lats than high oc but its 2100 and even set to 2700 it still does 2.0-2-2-5 so i guess i like both :roll:
     
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  9. xvi

    xvi

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    Everest reports 49.6 ns @ 3-3-3-8-12 2T 235FSB
    So it would be safe to assume that I could expect the same number to show up @ 2-3-2-8-12 2T 200FSB (Both seem to be the limit, but the latter being around the memory's limit for sure)?

    Edit: 48.5 ns now..
     
    Last edited: Dec 30, 2006
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  10. xvi

    xvi

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    [​IMG]
     
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  11. xvi

    xvi

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    Well, I just overclocked my roommate's computer. Specs are..
    Sempron 3100+ 130nm S754
    1GB OCz Gold PC3200 3-3-3-8-12-1T
    DFI LanParty UT nForce3 250gb

    He wasn't able to get anything more than 220FSB out of it. Just today, I lowered the memory divider and overclocked it to 260FSB. That puts him at 2.34GHz. This disproves my "FSB Limit" theory.
    Be right back. I made toast... Back. Mmm, toast.
    I don't know what to assume. I've set a memory divider, increased the voltages, set my CPU multiplier down, set my HT down..
    I'll play with it tonight, but I don't know how much more I can do.
     
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  12. Brother Esau New Member

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    Well my chip will reach 3.0ghz but......from what I see and feel there is no big difference in performance and realistic performance gain to shoot for 3.0ghz other than just the challenge of doing it and getting a 3.0ghz entry! My personal opinion is that I would rather have mine set up at around 2.8ghz with really sweet ram performance and very low latency other than that its just a dick measuring contest is all!!
     
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  13. xvi

    xvi

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    Yeah.. I wasn't able to get anything out of it. I'm running 2-3-2-8-12 2T @ 200FSB (DDR400.. aka: Stock). It's surprisingly fast.
     
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  14. Kammster New Member

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    Sempron 64 2800 - E6 controller (8x multipler)
    2 x 256 mb kingston value ram
    dfi nf3 250-al (value board)

    results from pcwizard 2006
    250fsb@ 1:1 vs 250fsb @ 208 mem..... is 2% faster


    250fsb@ 1:1 2.5-4-4-7
    Bandwidth 1 KB : 12660.47 MB/s
    Bandwidth 2 KB : 14087.76 MB/s
    Bandwidth 4 KB : 14854.12 MB/s
    Bandwidth 8 KB : 15112.35 MB/s
    Bandwidth 16 KB : 15437.95 MB/s
    Bandwidth 32 KB : 15522.46 MB/s
    Bandwidth 64 KB : 15484.12 MB/s
    Bandwidth 128 KB : 7725.52 MB/s
    Bandwidth 256 KB : 7857.7 MB/s
    Bandwidth 512 KB : 2995.67 MB/s
    Bandwidth 1 MB : 2985.68 MB/s
    Bandwidth 2 MB : 2991.38 MB/s
    Bandwidth 4 MB : 2985.56 MB/s
    Bandwidth 8 MB : 2989.41 MB/s
    Bandwidth 16 MB : 2950.87 MB/s
    Bandwidth 32 MB : 3021.27 MB/s
    Bandwidth 64 MB : 3018.39 MB/s
    Bandwidth 128 MB : 3020.47 MB/s
    Bandwidth 256 MB : 3019.07 MB/s
    Bandwidth 512 MB : 3021.12 MB/s
    Latency : 40.7 ns (82 cycles)





    250fsb @ 208 mem 2.5-3-3-6

    Bandwidth 1 KB : 13131.86 MB/s
    Bandwidth 2 KB : 14281.12 MB/s
    Bandwidth 4 KB : 14800.68 MB/s
    Bandwidth 8 KB : 15215.85 MB/s
    Bandwidth 16 KB : 15290.75 MB/s
    Bandwidth 32 KB : 15412.14 MB/s
    Bandwidth 64 KB : 15412.73 MB/s
    Bandwidth 128 KB : 7834.53 MB/s
    Bandwidth 256 KB : 7870.56 MB/s
    Bandwidth 512 KB : 2621.04 MB/s
    Bandwidth 1 MB : 2652.1 MB/s
    Bandwidth 2 MB : 2641.65 MB/s
    Bandwidth 4 MB : 2610.16 MB/s
    Bandwidth 8 MB : 2607.08 MB/s
    Bandwidth 16 MB : 2599.78 MB/s
    Bandwidth 32 MB : 2601.33 MB/s
    Bandwidth 64 MB : 2599.81 MB/s
    Bandwidth 128 MB : 2601.19 MB/s
    Bandwidth 256 MB : 2598.98 MB/s
    Bandwidth 512 MB : 2601.35 MB/s
    Latency : 49.64 ns (100 cycles)



    Rightmark reports : 29.91 Lataceny @ 3895 bandwidth
     
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