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Thread: How to run DDR2 PC8500 (1066 MHZ) stable on ASUS P5B-E motherboard

  1. #1
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    Apr 2012
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    How to run DDR2 PC8500 (1066 MHZ) stable on ASUS P5B-E motherboard

    I am just hoping that someone have answer for this question. My computer is previously configured with Asus P5B-E motherboard but running on older RAM which I took out from my friend’s PC. Now I have installed a new set of 2 GB kit (2 x 1GB) of Kingston Hyper X PC8500 (1066 MHZ) DD2 RAM. Then boot up the computer and enter into BIOS to manually configure the speed (1066 MHZ) and timing (5-5-5-15) consistent with the memory specs. At last I tried to change the voltage to 2.2 but in BIOS it allowed me to change only to 2.15 v or 2.25. It seems to quite odd. I tried the memory on 2.25 but the system was instable. The PC reboots sporadically while playing games and with some other apps in Windows. I can’t say if it is PSU problem but seems like it is lacking in power. What should I need to bring back the system stable and avoid random restarting? At the end I will try memory at 5-5-5-15 timing at 899 MHZ at 2 v. let see if that works well.

  2. #2
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    Jul 2011
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    Re: How to run DDR2 PC8500 (1066 MHZ) stable on ASUS P5B-E motherboard

    If I were you I would set the voltage to 2.15v. There might be some kind of variation in the voltage. Did you try setting the memory voltage to 'Auto'? By setting to Auto, the itself will drive the power which it need with specific timing and at 1066. My system is completely stable now because I also set it Auto mode. Since you are using two sticks make sure that both are in the same slots.

  3. #3
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    Re: How to run DDR2 PC8500 (1066 MHZ) stable on ASUS P5B-E motherboard

    I have exactly the same problem with my ASUS P5B-E, but with four other modules from one manufacturer. Unable to run the ram at 1066Mhz without having to freeze and BSOD, even after adjusting the timing according to the manufacturer. I confirm that ASUS P5B-E has problems with the kits in 1066 MHz memory, although it is supposed to manage them without worry.

  4. #4
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    Re: How to run DDR2 PC8500 (1066 MHZ) stable on ASUS P5B-E motherboard

    The modules are very well manufactured, and the heat sink is substantial, but are not programmed modules source with values of 1066 MHz, if not with the 800 MHz to reach 1066 MHz, the motherboard must be able to manually adjust values and the memory voltage as required 2.2V 1066MHz (vs. 800MHz 1.8v required). We must also note that some older motherboards may simply not be able to handle 1066 MHz, and this includes known for their quality cards (Asus P5B Deluxe, as I do) and in this case, only be achieved small improvements in speed over standard values (800MHz) with modules that are programmed. In my case, the modules operate at 814MHz stable (5,5,5,15) to 2.15 V. Raising the voltage to 2.25V did not result in improved capacity and apparently clocked at speeds decreased stability that had been stable at 2.15V. System: Asus P5B Deluxe WIFI / AP Core2Duo E6400 @ 3256 MHz (2130 stock) (FSB: 407MHz vs. 266 stock) to 1.35V.

  5. #5
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    Re: How to run DDR2 PC8500 (1066 MHZ) stable on ASUS P5B-E motherboard

    ASUS Super Memspeed technology improves the speed of the memory by 75%. For top performance, ASUS engineers’ team has effectively unleashed the true prospective of DDR2 memory. DDR2 1066 mode, ASUS's exclusive technology offers an option of FSB 1333 - was providing excellent performance for 3D graphics and additional memory intensive apps. To achieve top performance, the innovative ASUS Super Memespeed overcomes the flow of present FSB and DRAM - the updated technology that provides options for even more precise overclocking to unleash the true potential of DDR2 memory.

  6. #6
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    Re: How to run DDR2 PC8500 (1066 MHZ) stable on ASUS P5B-E motherboard

    Stop changing the voltage along the frequency. I want you to test 1000MHz at 2.05, 2.08, 2.1, 2.14, increasing gradually if you are able to make 1000 MHz stable. Uunfortunately in my case it passes directly from 899MHz (3.33) to 1066 (~ 4.0) in the BIOS. And as I board +0.1 v, +0.2 v, +0.3, +0.4 v for boosting the DDR. The best voltage to 1066 MHz is almost 2.1V to 2.2V. 2.1V and 2.2V are unstable in both 1066MHz 5-5-5-15 than 5-5-5-18. I still think that 889 MHz 4-4-4-12 at 1066 MHz is as fast as 5-5-5-15. Slightly slower read of the data, but very slightly.

  7. #7
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    Re: How to run DDR2 PC8500 (1066 MHZ) stable on ASUS P5B-E motherboard

    We are talking about native support for DDR2-1066 kit of two modules, possibly just 2x1GB. With 8GB is another story. You're probably talking D9 Micron chips that overclock very easily on nearly 1200MHz. First of all make sure that your motherboard does support this card and BIOS does have support for memory overclocking. Also make sure to set parameters (timings) and the divider suitable for motherboard to work at 1066 MHZ. The system should not suffer for that frequency because your RAM sticks are certified. So always give a right voltage as per the manufacturer's specifications.

  8. #8
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    Re: How to run DDR2 PC8500 (1066 MHZ) stable on ASUS P5B-E motherboard

    First thing for your motherboard and RAM is you should find your CPU frequency should be optimized RAM. I always check the max stable 4-4-4-12 and 5-5-5-15 with voltage 2.00V and 2.20v I rule the CPU 6 x 350 MHz not to overheat. I hesitate to mount the VNB and VFSB to 1.30/1.40v.
    And I start the test by mounting the FSB
    • 4-4-4-12 and 2.00V
    • 4-4-4-12 and 2.20v
    • 5-5-5-15 and 2.00V
    • 5-5-5-15 and 2.20v

    So I'm left with 4 max values stable.
    For example:
    • 4-4-4-12/2.00v 460MHz
    • 4-4-4-12/2.20v 480Mhz
    • 5-5-5-15/2.00v 520MHz
    • 5-5-5-15/2.20v 540Mhz

  9. #9
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    Re: How to run DDR2 PC8500 (1066 MHZ) stable on ASUS P5B-E motherboard

    Due to chipset limitation, 1333FSB processors can only run at a maximum speed of 1066FSB on this motherboard. This CPU seems to run hard to get right on this board (because of the FSB of only 1066). You can probably in the BIOS to overclock the FSB and thus possibly reach 1333 sometimes. That is because of the 2.13 GHz FSB 1066 * normal multiplier on this CPU. With FSB 1333 MHz, it would amount to 2.66 GHz if your system is stable with this "overclock".

  10. #10
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    Apr 2012
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    Re: How to run DDR2 PC8500 (1066 MHZ) stable on ASUS P5B-E motherboard

    I have Dual core with 2 GB of ram and have good speed. i still dont know that my Ram is DDR or not. What is the efficiency of this DDR2 Ram. Whats new and distinctive edge of this RAM.
    Dont bite me because this signature is approved from administrator CCTV

  11. #11
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    Re: How to run DDR2 PC8500 (1066 MHZ) stable on ASUS P5B-E motherboard

    Quote Originally Posted by harrisandreson View Post
    I have Dual core with 2 GB of ram and have good speed. i still dont know that my Ram is DDR or not. What is the efficiency of this DDR2 Ram. Whats new and distinctive edge of this RAM.
    Download a tool called Cpuz that will list what all hardware peripherals are there in your cpu, this way you will find out what ram you are using. It normally list all the memory module specification using SPD (Serial Presence Detect) : vendor, serial number, timings table. DDR2 ram is obviously a bit faster than the ddr ram.

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