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Thread: Why tighten memory timings?

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    Re: Why tighten memory timings?

    Quote Originally Posted by fresh View Post
    i have core at 685, shaders at 1500 and mem at 999. when i isntalled rivatuner i just opened it and there everything was, in terms of overclocking the shaders serperately; i found that it did give a performance increase when checking my 3dmark06 score. I did have the core at 700 but it wasnt stable and temps werent safe. I am only new to this and basically followed clunks overclocking guide and various other things, but this website Overclock.net - Overclocking.net will help you with everything. its american based so forgive them, but really useful.

    fresh
    I got RT to show me the shader clock, but have left it linked to core for now. Those are very high clocks compared to mine, especially the core. How are you cooling the VGA? What do you consider to be safe/dangerous temps and what drives up those temps most? Core or memory?

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    Re: Why tighten memory timings?

    Quote Originally Posted by demonicd View Post
    I got RT to show me the shader clock, but have left it linked to core for now. Those are very high clocks compared to mine, especially the core. How are you cooling the VGA? What do you consider to be safe/dangerous temps and what drives up those temps most? Core or memory?
    just the normal cooler and i have it set to 85%, my case is the antec 900 which has 3 80mm and 1 200mm tri cool fans. these i have set to mediuma dn the air flow is brilliant. at its hottest ive seen the gpu get up to 65C but my tower is under my desk and the heating was on. i have not checked which raises the temps more, i just kept increasing the speed until i got some glitches or whatever you call them in 3dmark then i backed it down.

    fresh

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    Re: Why tighten memory timings?

    When you raise the RAM freqs the timings in ms will lower.

    Timings of 5 at say 400 MHz will be lower than timings of 4 at 200 MHz.

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    Re: Why tighten memory timings?

    Aren't the timings (5-5-5-12 etc) measured in cycles? So increasing your bus speed and keeping ram 1:1 will mean tighter timings anyway. I've read an article somewhere that showed in benchmarks/games/general usage, tighter timings make very little difference.

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    Re: Why tighten memory timings?

    *bump*

    didn't want to start a new thread for something trivial (i know... it's not like me at all )

    but would i benefit from dropping the freq and tightening timings as ATM i'm on 5 4 4 12 @ 400mhz won't boot if i drop down further on CL @ 400mhz

    but i'm wondering whether to drop to 200mhz and go for 3 3 3 9 or tighter. what do you reckon guys??
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    Re: Why tighten memory timings?

    This thread is pure internet...

    Fanastically detailed knowledgeable quality information but with no definate answer

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    Re: Why tighten memory timings?

    In an Intel based system, timings make very little difference. In my experience it has always been better to go for raw CPU and memory bandwidth speeds over an exchange with tighter timings.

    AMD based systems with the memory controller on the chip will be hurt a bit more by lax timings. As for performance? That depends on what you do with your system.
    Also its dependent on how much you have to lower the timings by. If you do +1 across the main ranges but gain an extra 300mhz core speed from it, its almost certain that its a better solution every time. The very nature of overclocking means that you will need to find that threshold between lowering them and CPU core/bus gain and benchmark the two in the programs you use though.

    Thats as close as your going to get to "definite" because by and large, it depends on the system and its use in question.
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    Re: Why tighten memory timings?

    Everyone is always saying keepiong timings to 1:1 on the CPU RAM timings but once the CPU is overclocked is it fine to negate 1:1 to get a higher RAM speed to make full use of what you've paid for and possibly get more or will it make things worse, somehow ??????

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    Re: Why tighten memory timings?

    I personally have never found the 1:1 ratio to be crucial, it is a widely disseminated view, but as long as you are stable, then run some benchmarking software at the different ratios your RAM can handle and look at the numbers.

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    Re: Why tighten memory timings?

    Quote Originally Posted by ikix View Post
    Everyone is always saying keepiong timings to 1:1 on the CPU RAM timings but once the CPU is overclocked is it fine to negate 1:1 to get a higher RAM speed to make full use of what you've paid for and possibly get more or will it make things worse, somehow ??????
    I'd like to know this too, for beginner OC'ing do you just OC at 1:1 to find the CPU limit and then return the RAM to stock (assuming that the OC requires below stock ram speed)?


    Also if you have say a CPU with a 10x multiplier and wanted to get to 3.2ghz, using a board with a 1600fsb and 800mhz PC6400, would it be theoretically better to lower the multiplier and do a 400mhz x 8 clock on the CPU so that the FSB & RAM are at stock, or is it no different to just do a 320mhz x 10 (assuming the components allow for either of these options)

    I know it all comes down to real world in the end but I'd like to know in general terms whether one should aim to just get the fastest overall CPU speed (irrespective of mhz & multiplier used) or trying to balance CPU, FSB & RAM frequencies.

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