memory speed and memory timings

I have some newbie questions: (planning to buy P4P800 MOBO, I am not sure on what memory I need, what does this rating really means: Pc3200 vs PC 3500.
Does that mean that if I want to (eventually)overclock do I have to get the PC3500 memory to accomodate the increased timings or can I do it with the 3200 memory? Also, is there really that much difference in the dual channel? On the P4P800 if I was to never overclock with the 3500 memory does that mean essentially I wasted the money for the 3500 instead of the 3200? Any comments on why the ASUS QVL listing shows the 3500 and not the 3200?

Thanks in advance for the help!
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  1. First off you should use Dual channel for sure, It will give you a big performance boost.
    If you plan to overclock your P4 you will need to oc the cpu FSB, you should always keep the CPU FSb synced with our memory front side bus. Thats where PC3500 will come handy. It will let you use a 433(866)on your P4P without stability issue. If you stick with PC3200 it might not run stable at higher frequencies.
    So if you dont plan on overclocking at all stick with PC3200, if you want some head room get 3500 its not much more expensive.
    About that QVL list, I found that pretty much all branded sticks will run stable on the P4P800.

    Hope that will answer some of your questions.
  2. "...what does this rating really means: Pc3200 vs PC 3500."


    The PC3200 and PC3500 are ratings that are based on the theoretical maximum bandwidth. (I.E. PC3200 is 8 Bytes (Width)x 200MHz signal (Signal Speed)x 2 DDR (Bits per Clock)= 3.2GB/s or 3200MB/s)


    "Does that mean that if I want to (eventually) overclock do I have to get the PC3500 memory to accommodate the increased timings or can I do it with the 3200 memory?"

    You <b>might</b> be able to overclock the PC3200 from a 200MHz signal to something above that but that is not the verified performance level you are on your own. However, if you buy higher rated memory like PC3500 with is tested to run at a 216.66MHz or (650/3) MHz to be exact.

    Just as a heads up... you might see the marketing as 400MHz for PC3200 and PC3500 as 433MHz. It is the theoretical equivalent of the base clock speed as a DDR signal. (In reality it is still only 200MHz and 216.6MHz.) Marketing departments spin everything to make it sound better. The industry will call PC3200, DDR400 and PC3500, DDR433. Those are the proper names for the technologies. (I get anal about stuff like that so my apologies.)

    Anyway, if you want to clock your FSB up higher than 433MHz you will want to go with memory that is rated higher. (PC3700/DDR466 and PC4000/DDR500)


    "Also, is there really that much difference in the dual channel?"

    Dual channel really helps in maximum bandwidth. The P4 was designed around needing bandwidth. That i875 was also designed around delivering high bandwidth. Use it.


    "On the P4P800 if I was to never overclock with the 3500 memory does that mean essentially I wasted the money for the 3500 instead of the 3200?"

    Basically if you never use that memory at its DDR433MHz rating then you paid for more than you used.


    "Any comments on why the ASUS QVL listing shows the 3500 and not the 3200?"

    There are a lot of memories that you will not see on most company’s "Listings." You <b>will not</b> see Intel having anything rated above DDR400 in <A HREF="http://www.intel.com/technology/memory/ddr/valid/dimm_results.htm" target="_new">there list either.</A>

    Some companies just don't publish that for the end user. Internal and industry documentation exists but we the publics are not privy to that yet.

    Hope this helps.


    <A HREF="http://www.stompfest.com" target="_new">Stompfest Sept. 13-14 - Indy. IN</A> - Should be some good gaming!!!
  3. Ya hehe if should'nt have any question after that...
  4. Yeah, those answers definitely helped. I had read many of the articles but still never found out that PC3500 was a max performance rating and not a speed requirement that had to matched all the way around. Thanks alot!
  5. Umm Labbby first of all DDR433=216FSB, u divide it by 2 not multiply it.

    -Intel PIV 2.4C @ 3.84G -Asus P4P800 -OCZ Gold 2x256 3700EL memory @ 256mhz 2.5-3-3-7 -Sapphire 9800pro @ 490/780 -SB audigy -80G Maxtor Diamond Plus9 Ultra ATA-133 hdd -450 Enermax PSU
  6. Ya i Know that its 213 quad pumped.
    I only get messed up trying to explain, I'd put the fault on Intel marketing departement...
  7. LOL, I would too.

    -Intel PIV 2.4C @ 3.84G -Asus P4P800 -OCZ Gold 2x256 3700EL memory @ 256mhz 2.5-3-3-7 -Sapphire 9800pro @ 490/780 -SB audigy -80G Maxtor Diamond Plus9 Ultra ATA-133 hdd -450 Enermax PSU
  8. Which P4C are you buying?
  9. I am actually going to get the P4P800. I had considered the Kingston memory to go with it but am leaning toward the OCz memory.
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