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Thread: Overclocking AMD A64 3800+ X2, Which ram most suitable? pc4000 or pc3200?

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    Overclocking AMD A64 3800+ X2, Which ram most suitable? pc4000 or pc3200?

    I am hoping to replace my Athlon 64 3200 with a A64 3800+ X2 shortly. I will also be replacing my pc2700(Crucial 4* 512 modules) memory as well. So I was wondering which memory will make it easier for me to overclock the cpu with the minimum amount of changes in the BIOS? I've read many FAQs on how to overclock the Athlon64, but they all left me confused. Your advice on this will be greately appreciated.

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    Amateur photographer Hans Voralberg's Avatar
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    Do you want to use a divider or not ? The PCxxxx rating of RAM basically is the "ensured by the manufacturer" frequency at which it can operate. So if you want RAM to go 1:1 along side with the CPU, then the higher the rating the better (and more expensive lol). If you're to use a divider then PC3200 stuff would do fine.

    *PC4000 = HTT/FSB 250

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    What he's probably asking is what the real world difference is between PC3200 run at 4/5 on tight timings or PC4000 run at 1/1 on looser.

    I reckon as long as the RAM runs at 1T there's not a huge difference, but if you can get PC4000 at CAS 2.5, it will probably beat PC3200 at CAS 2.0. But we're talking in the realms of 1-2% so unless you don't care about cost, you should probably buy based on price.

    YMMV.

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    Unlike an Athlon XP, the A64 does not suffer a significant performance drop if you use a RAM divider as they are not close to being memory bandwidth limited. It's within a few %.

    Max CPU MHz is what you want for performance with this chip. If that means you need to run a divider then just do it.

    I would suggest 2 x 1GB of quality PC3200 that is known to be compatible with your mobo.

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    Thanks a lot for all your replies and apologies for not replying earlier. I finally had time to investigate this further and finally managed to work out how to overclock an Athlon 64. I now know what a divider is and how to employ it when overclocking. But what I really wanted to know was which memory would suit FSB overclocking, that is to say just one adjustment of a setting instead of having to change the multiplier as well.

    Here is the link that cracked the 'how to overclock the Athlon 64' mystery to me.

    A64 Ram Divider Training Guide and overclocking tips

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    Amateur photographer Hans Voralberg's Avatar
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    Any memory with the highest PC/DDR rating that you willing to go up to.
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    Yup, the answer is you can overclock on both no problem, but the one with the highest PC rating will have been tested for running at higher speeds, meaning you can overclock more without a divider.

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