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Thread: Problems running 8gb RAM on EP45-UD3P




  1. #1
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    Default Problems running 8gb RAM on EP45-UD3P

    Hi, I'm trying to run 8gb of RAM on my new EP45-UD3P.

    I have 2 sticks of G.Skill F2-6400 (1.8V-1.9V) and 2 sticks of G.Skill F2-8000 (2.0V-2.1V).
    I've tried a bunch of configurations and the only ones that work are having only a stick in slot1, or having sticks in slots 1 and 2. Having sticks in slots 1 and 3, for example, does not work. (When a configuration "does not work", the system fails to boot. I get the short, continous beeps.)

    I've messed around with the BIOS a little based on other threads I've found in these forums, but I don't really know what I'm doing in there with RAM settings and nothing made the situation change, so right now I'm at default settings.

    What can I do to use all 8GB of RAM? If there's other information you need to help me solve my problem, let me know.

  2. #2
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: Problems running 8gb RAM on EP45-UD3P

    You can't mix ram without headaches and issues, and it is never good to mix speeds/voltages.

    Those in particular since they are very different voltages and speeds you may never get them to work without using 2.0-2.1V on all of them at 800Mhz, which would void your warranty.

    You will need to raise your MCH voltage to 1.24-1.34 and be sure tRD (Static tRead Value) is not set to low, start with 10 maybe. Then also be sure tRFC is set to 82-92 for now as well.

  3. #3
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    Default Re: Problems running 8gb RAM on EP45-UD3P

    OK thanks for your help.

    I'll go pick up two sticks of the faster g.skill RAM today.

    My only concern is that when I tried sticking in the two sticks of the same RAM in slots 1 and 3 it didn't work (beeps on power on). Any idea why that would be?

    If I do pick up two matching sticks of the faster RAM, do I need to make the recommended changes in my BIOS, or should I try it all on default?

  4. #4
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    Default Re: Problems running 8gb RAM on EP45-UD3P

    Follow the suggestions in this post and then apply Lsdme's recommended settings. Start with only 2 memory modules in slots 1 & 3. If this doesn't work, replace the 1st set with the 2nd set and try again. Mobo memory slot problems are rare, but they do happen on occasion.
    You might need to perform the initial bios settings using only one memory module in slot #1.
    Follow steps 1 - 4 below the suggested bios settings. Use the generic bios template at the bottom of the post and fill out the bios settings that you're using. Post your bios settings if you're still having problems.

    Before you remove or replace memory modules:
    1) With your computer off, turn off the power to the psu by using the psu's on/off switch.
    2) Press and hold the computer case's on/off switch for 10 seconds.
    3) Insert your memory modules.
    4) Turn on the psu power switch and then start your computer.
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  5. #5
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    Default Re: Problems running 8gb RAM on EP45-UD3P

    You will likely need to make the suggested changes, maybe even further. But yes, please try to get matching sets. You might as well save and buy another 6400 set because you may have a hard time getting 8GB to run at 1000+

    So are you saying either set used separately will not work in slots 1+3? If so, you may have bad slots, do you have any older or different ram to also test with, if this is the case?

  6. #6
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    Default Re: Problems running 8gb RAM on EP45-UD3P

    Quote Originally Posted by Lsdmeasap View Post
    So are you saying either set used separately will not work in slots 1+3? If so, you may have bad slots, do you have any older or different ram to also test with, if this is the case?
    Yes, this is what I'm saying. I've tried both sets of RAM and they both work in slots 1+2, but neither work in slots 1+3.

    I don't have any older RAM laying around. My roommate runs 4x4GB though. I'm not sure what kind of RAM, but I'm sure he'd let me use it to test.

  7. #7
    Lsdmeasap's Avatar
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    Default Re: Problems running 8gb RAM on EP45-UD3P

    I would try to find something to test with, sounds like your slot 3 might be bad. Can you use 2+4? Can you use 3 by itself, not sure if that would work so just asking?

    So both your sets, neither work by themselves in slots 1+3? How about 2+4? Just trying to figure this out as you should be able to use 1+3 as it is the norm/intended slots for dual channel with 2 sticks. Did you ever run that way?

    Ya, you need some other ram to test as it could just be the ram you are using, and I am not so sure 4GB sticks would help in the tests either as they may not work at all. But it is worth a try if you can't find any others to borrow.

    Or you could pickup some el cheapo $5 sticks on ebay, if you ebay.

  8. #8
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    Default Re: Problems running 8gb RAM on EP45-UD3P

    SFchief had similar issues several months ago. His problem turned out to be the #3 memory slot was bad.
    I did extensive memory slot testing on my mobo to help him out.
    Using slots 2 & 4 worked perfectly, passing all stress tests. I continued using this setup for a little over 2 months with no performance or stability issues.
    Using slots 1 & 2 worked fine, but memory bandwidth from Memtest86+ was reduced by 10%.

    Have you tried using only 1 module in slot 3?
    Did you repeat this #3 only test with each of your memory modules?
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
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