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Thread: GA-Z77X-UD3H choosing between 1.5V and 1.65V RAM? please help




  1. #1
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    Default GA-Z77X-UD3H choosing between 1.5V and 1.65V RAM? please help

    Hello folks, long time no see!
    Me myself had the infamous continuous reboot and debug code (iirc) 15 but that was in December 2012 I think, with a single 2GB module. I've solved it by fiddling in bios (I think I've loaded some kind of backup bios from a secondary location). But now I have a big dilemma and I hope some more experienced users could give me some advices. Thank you in advance for your time.

    My config:
    Gigabyte GA-Z77X-UD3H, I think it's rev.1.0, with last NON-BETA BIOS (F18, more than one year old for sure)
    Intel i5-3570K, just installed it a few days ago, worked apparently fine with the 2GB sitck mentioned below (but I haven't performed any stability/benchmark testing)
    cheap (Chinese brand DELUX) 450W ATX V2 PSU (will change in the future when I'll buy a graphics card, possible GTX660 or R7 265)
    2GB module DDR3 1600MHz PQI (1.5-165V) - unfortunately I gave it away before checking what was the voltage, frequency and timings it was running at; the system worked reasonably well -initially with a Celeron G530- with occasional lock-ups in games known to be "glitchy"/buggy such as Lego-series game (Star Wars, Batman etc) - I'm not sure if the games were to blame, or the system.
    I think the memory was this one DDR3-1600 - PQI Group

    I want to replace the ram with one of the following. I've read in multiple sources that it is absolutely not recommended to run Ivy Bridge with ram voltage higher than 1.5V. Also my botherboard is supposed to require 1.5V only and no more. That's even if Intel supports 1.65V ram for Ivy Bridge CPU (on RAM compatibility official lists) and there are XMP profiles @1.65V. So that is what I don't get. If Intel supports 1.65V RAM but also states that 1.5V is maximum allowed, are we supposed to run it at 1,65V, or down-volt it to 1.5?
    Depending on the answer tot that, if I want a perfectly stable and reasonable performing system, what would you advise me to buy from those below? I cant spend more than 100US$ but since in my country all the prices are higher, that might mean less than $80 in "newegg prices".
    Is there any point to buy PC3 19200 memory if I'm going to actually run it @1333 and 1.5V? I definitely don't want to run it at 1.65V since this might damage the memory controller and the CPU itself - or so I've read on tens of different sites.

    So, please, what would you advice me to buy from the options below? Is the "FURY" 1866MHz CL10 @1.5V the best option? It is the only one recommended by Kingston on their website, for my motherboard. I do have access to Crucial and Corsair (no G.Skill and few Geils in Romania :( ) but they are considerably more expensive here.

    HyperX Beast 8GB (2 x 4GB) DDR3 2400 (PC3 19200) Desktop Memory Model KHX24C11T3K2/8X
    HyperX Beast 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 2400 (PC3 19200) Desktop Memory Model KHX24C11T3K2/8X - Newegg.com
    newegg price $95 / my price $89 (promotion valid just a few days)
    XMP TIMING PARAMETERS
    • JEDEC: DDR3-1333 CL9-9-9 @1.5V
    • XMP Profile #1: D3-2400 CL11-13-13 @1.65V
    • XMP Profile #2: D3-2133 CL11-12-11 @1.6V

    HyperX Beast 8GB (2 x 4GB) DDR3 1600 (PC3 12800) Desktop Memory Model KHX16C9T3K2/8X
    HyperX Beast 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model KHX16C9T3K2/8X - Newegg.com
    newegg price $77 / my price $96
    XMP TIMING PARAMETERS
    • JEDEC: DDR3-1600 CL11-11-11 @1.5V
    • XMP Profile #1: D3-1600 CL9-9-9 @1.65V

    HyperX Fury Black Series 8GB (2 x 4GB) DDR3 1866 Desktop Memory Model HX318C10FBK2/8
    PnP JEDEC TIMING PARAMETERS:
    • DDR3-1866 CL10-11-10 @1.5V
    • DDR3-1600 CL9-10-9 @1.5V
    • DDR3-1333 CL8-9-8 @1.5V
    Newegg.com - HyperX Fury Black Series 8GB 240-Pin DDR3 SDRAM DDR3 1866 Desktop Memory Model HX318C10FB/8
    newegg price $78 / my price $101, launched in April 2014, might be available next week, not 100% sure.

    Many thanks in advance! I really appreciate your help!
    Last edited by reb; 04-17-2014 at 06:24 PM.

  2. #2
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    boondocks is offline Senior Member
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    Default Re: GA-Z77X-UD3H choosing between 1.5V and 1.65V RAM? please help

    1.65v is fine if the kit is designed for it. I was running both my Z77 UD5H boards with DRAM designed to run OC with xmp settings of 1.65v . In fact I've had probably had 6 DRAM kits for my IB & Haswell boards that run at 1.65v.
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  3. #3
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    Default Re: GA-Z77X-UD3H choosing between 1.5V and 1.65V RAM? please help

    Thank you boondocks, in that case the promo discounted Kingston HyperX Beast 8GB (2 x 4GB) DDR3 2400 running with XMP Profile #1: D3-2400 CL11-13-13 @1.65V would be the best option?
    but then....
    1. I'm not sure about Haswell, but for Ivy Bridge I keep reading going higher than 1.5V should be avoided and that 1.65V will damage the CPU (mine is i5-3570K) in a few years and also might cause instability... would I be on the safe side to get a 1600 @ 1.5V?
    2. the mobo supports DDR3 2800(OC)/1600/1333/1066 MHz and I've read it won't accept any frequency between 2800 and 1600 - is this true? that would mean that it can't run RAM at 2400...
    i'm really puzzled...

  4. #4
    boondocks's Avatar
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    Default Re: GA-Z77X-UD3H choosing between 1.5V and 1.65V RAM? please help

    All I can tell you is I've had excellent luck with Kingston DRAM and Gigabyte boards....and that ever since Z77 came out I've been running 1.65 DRAM voltage. I ran G Skill Trident X DRAM @ 2400 with no problems until I sold it recently.

    If you really think 1.65v is going to degrade your cpu then just avoid DRAM that needs it, plain and simple.
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    SOLD:Z97X-UD5H /4790K/F11b mod BIOS/4.8@1.38 4x4GB Kingston Genesis KHX24C11X3K4 2400 RAM 11-13-13-30
    SOLD:Z87X-UD5H /4770K


  5. #5
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    Default Re: GA-Z77X-UD3H choosing between 1.5V and 1.65V RAM? please help

    Then leaving the 1.5/1.65V problem aside and assuming 1.65 won't do any damage, what would be faster?
    • D3-2400 CL11-13-13 @1.65V
    or
    • JEDEC: DDR3-1600 CL11-11-11 @1.5V
    • XMP Profile #1: D3-1600 CL9-9-9 @1.65V
    or maybe...
    • DDR3-1866 CL10-11-10 @1.5V
    ?

    I asume the first one (2400 MHz@1.65V) but this seems too good to be true because it's also the cheapest so I'm kinda hesitant.
    Would HyperX Beast 8GB (2 x 4GB) DDR3 2400 (PC3 19200) Desktop Memory Model KHX24C11T3K2/8X be the best deal AND ALSO WORK in my board ?
    Thank you again for your time.

  6. #6
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    Default Re: GA-Z77X-UD3H choosing between 1.5V and 1.65V RAM? please help

    Correct me if I'm wrong, but wouldn't the OP be better off buying a less expensive 1600MHz memory kit and possibly overclocking the memory to 1866MHz?

    Are there any real world benefits with running memory at 2000MHz or higher settings?

    Check out http://forums.tweaktown.com/memory/4...dy-bridge.html
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    Default Re: GA-Z77X-UD3H choosing between 1.5V and 1.65V RAM? please help

    But even so, wouldn't I be able to simultaneously under-clock and under-volt the 1.65V memory?
    If the spd table contains:
    JEDEC: DDR3-1333 CL9-9-9 @1.5V
    XMP Profile #1: D3-2400 CL11-13-13 @1.65V
    XMP Profile #2: D3-2133 CL11-12-11 @1.6V
    Then I might be able to run it D3-1600 @ CL10 or CL11 and 1.5 V?

  8. #8
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    Default Re: GA-Z77X-UD3H choosing between 1.5V and 1.65V RAM? please help

    Quote Originally Posted by boondocks View Post
    If you really think 1.65v is going to degrade your cpu then just avoid DRAM that needs it, plain and simple.
    The problem is that I don't know what to think :) I found contradictory info...

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    Default Re: GA-Z77X-UD3H choosing between 1.5V and 1.65V RAM? please help

    2133mhz tends to be the sweetspot on z77,any higher performance usually drops off,only the latency improves

    1.65v is fine on sandy and ivy
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  10. #10
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    Default Re: GA-Z77X-UD3H choosing between 1.5V and 1.65V RAM? please help

    I bought the KHX24C11T3K2/8X and it's running @ 1600 MHz with 1,5V and CL11 :(
    But also 2400 MHz XMP runs fine and seems considerably faster (placebo? :D)
    GA-Z77X-UD3H choosing between 1.5V and 1.65V RAM? please help-clipboard01-jpg

    I can't say I'm hundred percent happy but also not very unhappy. I wonder if I could run it @1.5V and 1866 Mhz... while keeping CL11...
    I'll report back if I find some better settings. Interesting that Kingston's website misses the 1600 MHz profile, which form me seems the most useful for those wanting to keep "conservative" / safe settings.

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