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Thread: Which Memory




  1. #11
    Chike is offline Senior Member
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    Default Re: Which Memory

    At stock there is no reason to use anything above DDR-800.
    I see you OC to 3GHz, even at 333 FSB the low latency modules will be just as good as the higher speed modules.
    The board should not have a problem with the PI series if the cpu cooler leave the memory slots clear.

  2. #12
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    Default Re: Which Memory

    Quote Originally Posted by Chike View Post
    At stock there is no reason to use anything above DDR-800.
    I see you OC to 3GHz, even at 333 FSB the low latency modules will be just as good as the higher speed modules.
    The board should not have a problem with the PI series if the cpu cooler leave the memory slots clear.
    I did wonder if the lower frequency would make a difference even though they are lower latency, a bit of googling found me a site had reveiwed them and then ran some benchmarks against some 1066 kingston ram. It wasn`t that far behind on stock settings but overclocked nicely to just over 1000 and beat the kingston at 1066.
    I`m going to check out how much room I have under the cooler fan, that may be the deciding factor.

    BTW which is the newer ram, the PK series or the PI series?
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  3. #13
    Chike is offline Senior Member
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    Default Re: Which Memory

    See this post for a benchmark I recently did at 333FSB with settings as Dominator 1066, vs default XMS2 low latency settings.
    1066 were done with tRD(Static tRead Value) 6 and 800 with 5. Haven't tried booting with tRD 5 for 1066, if I could 1066 results might have been a bit better.

  4. #14
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    Default Re: Which Memory

    Quote Originally Posted by Chike View Post
    See this post for a benchmark I recently did at 333FSB with settings as Dominator 1066, vs default XMS2 low latency settings.
    1066 were done with tRD(Static tRead Value) 6 and 800 with 5. Haven't tried booting with tRD 5 for 1066, if I could 1066 results might have been a bit better.
    Thats a nice bit of info there, and looking at it the 800Mhz is just a touch faster overall than the 1066Mhz.Performance wise theres nothing in it, so it just boils down to price and availability.

    Thanks for that Chike.
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  5. #15
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    Default Re: Which Memory

    Well the decision has been made for me, new stock of the 800Mhz low latency sticks has gone up in price and it`s now 15 dearer than the G.Skill PC2-8500CL5D-4GBPK which I`ve just ordered.

    Thanks for your help Chike & Psyco
    NZXT Hush case
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  6. #16
    Chike is offline Senior Member
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    Default Re: Which Memory

    Those should not have any problem running DDR-800 with 4-4-4-12 timings, so see which result in better performance.

  7. #17
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    Default Re: Which Memory

    Quote Originally Posted by Chike View Post
    Those should not have any problem running DDR-800 with 4-4-4-12 timings, so see which result in better performance.
    As long as FSB is 333 or over, 5-5-5-15 @ 1066 is guaranteed to be the better performer with regards to latency and bandwidth. dropping CAS latency bt one isn't enough to over power the extra 133MHz (266-DDR). Lower FSB's may be different, or even the same.

    As nicely laid out as that benchmark you posted is, it's an unfair test. If the 1066 modules won't do tRead 5 then you should have ran both sets at tRead 6. I know that in the real world tReads achievable on different sticks will vary etc, but not having tRead the same means that it's taken away from the idea of DDR-800 4-4-4-12 VS DDR-1066 5-5-5-15. Virtually no doubt that with Tread of 6 for both, 1066 would be ahead by 100-200MB/s on most if not all tests and also ahead on latency at your given FSB. Again, different FSB speeds may alter this.

    It may be however that running the GSkill PK at lower frequency means you can drop the tRead, but there's no guarantee.

    Either way, those sticks are good. Ordering a set for my current build, a HTPC for my parents. I may just steal them and give them my XMS2.....
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  8. #18
    Chike is offline Senior Member
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    Default Re: Which Memory

    Quote Originally Posted by Psycho101 View Post
    As long as FSB is 333 or over, 5-5-5-15 @ 1066 is guaranteed to be the better performer with regards to latency and bandwidth. dropping CAS latency bt one isn't enough to over power the extra 133MHz (266-DDR). Lower FSB's may be different, or even the same.
    Guaranteed by whom, and what do we get if it doesn't? I have posted a link to a benchmark I have done with both, in post #13, judge for yourself.

    EDIT: Sorry I didn't read till the end.
    I don't deal with hypothesis, I was making that benchmark to compare to the OP results.
    Feel free to boot with DDR-1066 tRD 5 @ 333FSB if it is possible, and prove your claim.
    Last edited by Chike; 10-23-2009 at 05:27 AM.

  9. #19
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    Default Re: Which Memory

    I have previously compared both DDR-800 and DDR-1066 here in this forum using Everest. Settings were 333 FSB, tRead =9 (for both speeds) with stock CPU speed 2.8GHz. I also compared DDR-800 to DDR 1066 in Far cry 2, again at the same FSB and tRead. I lost ~5 FPS on average at DDR-800 4-4-4-12, that was with 9 runs of the Far Cry 2 bench utility (it does 3 runs each execution, and I executed it 3 times).

    I wasn't saying you're wrong about DDR-800 possibly being better, but it has to depend on other settings to be so. If a lower tRead can be used when shifting to DDR-800 combined with the primary timing shift to 4-4-4-12 and hopefully being able to squeeze advanced timings eg tRFC et al, then it could very well be pulled of.

    From a purely scientific standpoint of absolutely every other setting being completely identical and the only changes being the SMM to get either 1066 or 800, and primary timings changing between 4-4-4-12 and 5-5-5-15 I personally guarantee that 1066 will win out. Not by a huge margin, but by enough for it to be consistently repeatable. Note that a consistent CPU speed and FSB is essential for this to be true. The test should also be conducted with the same modules. tRead must be the same as it's a huge performance advantage to have one lower than the other, by the order of up to 400MB+ at times.

    I did a heap of testing on the pros and cons of 1066 VS 800, because these XMS2 I have currently will do DDR-800 @ 4-4-4-12, 2.1V as well as DDR-1066. 1066 won out at 400*9, 333*10.5 and also at 266*10.5. 266*10.5 showed the least difference, tiny but repeatable.

    I speak purely from a mathematical point of view. plug the numbers in and do the calculations and 1066 @ 5-5-5 15 will always come out on top in regards to latency and bandwidth.

    I'm currently finishing something on SSD's atm so don't have time to bench RAM ATM. Anyone curious is welcome to try, as long as they have a set of modules that can do both speeds and timings. If no one post s anything I'll take some Everest shots at each and maybe some form of real world test, like a Handbrake benchmark encode.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

  10. #20
    Chike is offline Senior Member
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    Default Re: Which Memory

    OK, you're twisting my arm, I'll do it, though I am quite sure I won't be able to boot DDR-1066 with tRD 5 @333FSB, I was surprised it booted at all.

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