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  1. #1
    Member eva2000's Avatar
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    Cool Asus P5K Deluxe - Important tip = Black dimm slots > Yellow dimm slots

    2x1GB Twin2X2048-10000C5DF Dominator
    Asus P5K Deluxe 0311 bios

    I decided to revisit my 2x1GB Twin2X2048-10000C5D Dominator memory rated at DDR-1250Mhz 5-5-5-18 at 2.4v (kindly supplied by Corsair ).

    Originally, even with 0311 official bios the 10000C5D Dominators were a bit more than flaky on P5K Deluxe - understandably so as 10000C5D Dominators are validated only on eVGA 680i motherboards. But it seems now that I am retesting them in black dimm slots instead of yellow dimm slots, they're alot more stable particularly at 4-4-4-x timings needing less vdimm and clocking a bit tighter on memory timings in black dimm slots than in yellow dimm slots!

    Note, prior to these tests all my 2x1GB memory testing to date on P5K Deluxe has been in the yellow dimm slots.


    I managed to pull off some quick tests for low clock Super Pi Challenge @3600Mhz and managed my fastest Super Pi 1M and 32M times to date for a quad core Kentsfield Q6600 cpu
    CPUZ Validation

    Super Pi 1M

    Super Pi 32M

    From my experience on Asus P5B Deluxe, quad core kentsfield B3 stepping is around 10-20 seconds slower clock for clock than core 2 duo B2 dual core cpus. And even my personal best E6700 B2 dual core time on P5B Deluxe @3600Mhz is only 13min 08ish.

    Will have to do some more tests with black dimm slots it seems.

    Edit: okay confirmation from bingo13/Gary from Anandtech here, black dimm slots are designed to do this according to Asus!

    Quote Originally Posted by bingo13 View Post
    The black slots are required for high memory clocks or stable low latency settings on either P5K board, in fact on the P5K3, the only way to get above 1800 in dual channel mode is to use the black slots. ASUS has the official explanation coming shortly...
    Edit 2: Yup can confirm now black dimm slots rule for 10000C5D Dominators on P5K Deluxe

    Black dimm slot = 625mhz 5-5-5-15 3-30-3-3-8 at 2.4v memtest able
    Yellow dimm slot = 590mhz 5-5-5-18 10-42-10-10-11 at 2.45v semi stable in memtest

    Huge difference!

    Memory Addict

  2. #2

  3. #3
    Member eva2000's Avatar
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    According to Gary/bingo13's work with with Asus, it's be design from Asus.. official announcement of the reason is due soon apparently

    Memory Addict

  4. #4
    Member mgoode's Avatar
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    well that sucks for me because I am running 4x1gb with all the slots populated. I am going to pull two sticks and see if i can duplicate eva2000 results.
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  5. #5

    ||Console||'s Avatar
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    Hmm I will give this a shot to night .
    How far will 6400 D9's go I had it @ ddr1100 last night and that seamed to be as far as I could get .
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  6. #6
    Magical Leopluridon Senior MadMan007's Avatar
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    That's interesting...but if it's a matter of the black slots being 'better' and the others being 'the same' as other mobos it's really just a bonus not a negative. For more standard oc'ing and not max FSB/Ram and pure benchmarking runs it shouldn't be an issue though, 450+ FSB ought to be enough for any current CPU. It could matter for Penryns though...

    Have you tried this with any other memory?
    Last edited by MadMan007; 06-13-07 at 09:07 AM.
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  7. #7
    Member dudleycpa's Avatar
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    Subscribed. Thanks eva2000!

  8. #8
    Member BLOOP!'s Avatar
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    Good find! My Ballistix at 4:5 wont pass memtest, so I backed down to 5:6 then eventually went back to 1:1. I'll try this when I get home

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  9. #9
    Member eva2000's Avatar
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    I don't see it as problem with 4x1GB configs, i had 4x1GB micron d9gmh at 490mhz 4-4-4-9 2-25-2-2-4 tight sub timings on P5K Deluxe fine.

    Haven't tried this with other memory yet focusing on 10000C5D first.

    2x1GB Twin2X2048-10000C5DF Dominator
    Asus P5K Deluxe 0311 bios

    More tests to confirm that indeed black dimm slots on Asus P5K Deluxe seem to clock these 10000C5D Dominators alot higher with tighter timings and lower vdimm than yellow dimm slots.


    Corsair 10000C5D Dominators:

    Using memtest86+ v1.70:

    Yellow slots = 590mhz 5-5-5-18 10-42-10-10-11 at 2.45v memtest semi stable
    Black slots = 625mhz 5-5-5-15 3-30-3-3-8 at 2.4v memtest able

    In windows had to loosen the subtimings up and drop the clocks a bit for 2.4v vdimm but still @620Mhz 5-5-5-15 8-30-8-8-8 at 2.4v is much better than Yellow slots @590mhz 5-5-5-18 10-42-10-10-11 at 2.45v which was only semi stable in memtest.

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  10. #10
    Insatiably Malcontent
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    johan851's Avatar
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    Interesting. Thanks for posting this. I'll be putting together my P5K-Deluxe / E2160 system pretty soon, and this tip will be very handy.
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