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Thread: Overclock GA-EP45-UD3P e8500




  1. #1
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    Default Overclock GA-EP45-UD3P e8500

    Hi I'm definitely a newbie when it comes to overclocking. So I tried using EasyTune 6. I choose the first option and select 3.67 GHz 1600 MHz FSB. I reboot, Windows Vista SP1 sees it as running at 3.80 GHz. After about 10 minutes, idle or working, it reboots.

    I know this is not a lot of info but off the top of anyone's head... where do I go from here?


  2. #2
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    Default Re: Overclock GA-EP45-UD3P e8500

    It should be 3.8GHz as the multiplier of that CPU is 9.5 and 9.5 x 400 = 3800

    If you just increase the FSB it will increase the RAM speed as well, you need to change the system memory multiplier so as not to cause your RAM to run faster than it can handle. Try the 2.0D setting

    Also, you definitely need to increase voltage to make it run stable, try CPU Vcore at 1.325V.

    Also please tell me all your exact hardware, especially what PSU you are using.

    You can also give this a read:

    Overclocking basics
    Let’s start with definitions about what is what.
    The CPU speed is derived from the FSB multiplied by…. the multiplier!

    FSB (Front Side Bus): The connection of the CPU to the northbridge*, usually 200, 266 or 333 MHz for current Intel CPUs. As four bits of data are transferred every clock cycle (i.e. every Mhz), Intel markets these as 800, 1066 and 1333 respectively because of that. These higher frequencies are also often referred to as the effective FSB.
    The FSB can be adjusted upwards and downwards and is only limited by how much the motherboard and CPU are capable off.
    * chip on your mainboard connecting the CPU to everything else, a higher FSB means more bandwidth and is therefore better for perfromance

    Multiplier: This is locked and can only be decreased but not increased to a setting higher than the stock value. The difference between an E8400 and an E8600 CPU for example is the stock multiplier of 9 for the E8400 (resulting in 333 x9 = 3.0GHz) and 10 for the E8600 ( 333 x10 = 3.33GHz)
    Because the multiplier is locked on all CPUs but the Extreme Edition CPUs you can only overclock your CPU by increasing the FSB.


    RAM: DDR RAM (no matter whether DDR1, DDR2 or DDR3) actually runs at half the speed it’s quoted at (i.e. 333 MHz for DDR2 667, 400 MHz for DDR2 800, 533 MHz for DDR2 1066 etc.). As it transfers two bits of data per clockcycle these higher effective frequencies are commonly used though.
    RAM is backwards compatible, meaning that you can always run faster RAM at a slower speed (e.g. 1066 RAM at 800 or lower).
    The important thing about RAM when overclocking is that it needs to be able to run at least as fast as the speed of your FSB (I’m talking about the real MHz, not the effective values). So if you want to overclock your E8400 to 4.5 GHz (500 x9 = 4.5GHz which would be high but is possible) you would need RAM capable of running at 500 MHz (DDR2 1000) so you should get DDR2 1000 or better RAM. It is also possible that RAM rated for 400 MHz (DDR2 800) can run at 500 MHz, but since RAM is so cheap right now it’s a good idea to buy RAM that’s guaranteed to run at the speed you need.
    You can also run RAM at a higher speed than the FSB, there’s a setting called “system memory multiplier” on Gigabyte boards in the BIOS for that. If you have a FSB 333 MHz CPU (1333 quad-pumped) and DDR2 800 (400 MHz) your BIOS will likely automatically cause it to run at DDR2 800 which is the 2.4 system memory multiplier (333 x 2.4 = 800).
    The A, B, C, D at the end of the system memory multiplier indicate at which FSB the multipliers should be used. Always take the one closest to your FSB, rounding up.
    Last edited by Nickel020; 02-14-2009 at 01:18 AM.

  3. #3
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    Default Re: Overclock GA-EP45-UD3P e8500

    Thanks for you quick reply. Here's the rest of the specs...

    Power:
    Model
    Brand Rosewill
    Model RP600V2-S-SL-S
    Spec
    Type ATX12V v2.01
    Maximum Power 600W
    Fans 1 x Silent 120mm Ball-bearing Blue LED Fan
    PFC No
    Main Connector 20+4Pin
    +12V Rails Yes
    PCI-E Connectors 2 x 6Pin
    CrossFire Ready
    SLI Certified
    Modular No
    Power Good Signal 100-500ms
    Hold-up Time > 16ms
    Efficiency > 72%
    Over Voltage Protection +3.3V, +5V, +12V1, +12V2
    Input Voltage 115/ 230 V
    Input Frequency Range 50/60 Hz
    Input Current 12A @ 115V, 6A @ 230V
    Output +3.3V@30A, +5V@55A, +12V1@19A, +12V2@19A, -12V@1A, +5VSB@2.5A
    MTBF 100k hours at 25C, max. load, nominal input
    Approvals CSA, UL, TUV, FCC


    Memory:

    Model
    Brand Patriot
    Series Viper
    Model PVS24G8500ELKR2
    Type 240-Pin DDR2 SDRAM
    Tech Spec
    Capacity 4GB (2 x 2GB)
    Speed DDR2 1066 (PC2 8500)
    Cas Latency 5
    Timing 5-5-5-15
    Voltage 2.1V

    Video:
    Sapphire Radeon 4850
    Chipset
    Chipset Manufacturer ATI
    GPU Radeon HD 4850
    Core clock 625MHz
    Stream Processors 800 Stream Processing Units
    Memory
    Memory Clock 1986MHz
    Memory Size 1GB
    Memory Interface 256-bit
    Memory Type GDDR3

  4. #4
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    Default Re: Overclock GA-EP45-UD3P e8500

    Does it work with the icnreased VCore and lower memory multiplier?

  5. #5
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    Default Re: Overclock GA-EP45-UD3P e8500

    Thanks again for your quick reply. Sorry on my part I had to step out for a while. Anyway. I did make the settings as you suggested and the system is quite stable. I did have another question... The EasyTune 6 software shows my RAM as PC2-6400 (400MHz) but this RAM is PC2-8500(1066) also the tuner shows the default as being 1065 but only running at 800. Did I throttle back my RAM in order to stablize? Can it be brought up an higer than 800?


  6. #6
    Join Date
    Sep 2008
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    Default Re: Overclock GA-EP45-UD3P e8500

    RAM speed is dependant on FSB speed via the system memory multiplier. I.e. RAM speed = FSB x system memory multiplier.
    I told you to set FSB to 400 and the multiplier to 2 so 800 is what it's running at. To change that set the memory multiplier to 2.66D but make sure DRAM voltage is set to the value specified by the manufacturer.
    Run prime 95 for several hours to verify stability and use coretemp to check whether your CPU temp stays under 65C.

  7. #7
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    Default Re: Overclock GA-EP45-UD3P e8500

    Thanks! I figured that out last night. I have set to 2.66D which in turn makes the ram run at 1064. It definately seems stable. I downloaded those programs and will begin testing shorlty. Again, thanks so much for your help.

  8. #8
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    Feb 2009
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    Default Re: Overclock GA-EP45-UD3P e8500

    Ok I have this same new board with the E8400 3.0Ghz processor. I tried boosting the FSB without changing anything else and the system crashed and kept rebooting.

    I am using Corsair XMS DDR2 PC8500 memory 5-5-5-15

    The question I have is if you overclock should you set all the CMOS setting to manual. I was wondering if when in auto it would cause problems but I really don't know. Everything I read online says to can the Easytune6 and overclock in BIOS. I assume this means taking everything out of auto setting as far as the FSB and RAM speed goes.

    Can you suggest what multiplier and Vcore I should use to run the memory at its rated 1066 speed? Would this be the only changed I need to make??

  9. #9
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    Default Re: Overclock GA-EP45-UD3P e8500

    I believe the multiplier for that CPU is 9, the bios should show that by default. The only changes I made were to set the FSB at 400MHz Changed the memory multiplier to 2.66D and the cpu vCore to 1.325V. When you change the memory mult. be sure to use a number in the x.xxD range, that's for 400 MHz FSB.

  10. #10
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    Default Re: Overclock GA-EP45-UD3P e8500

    Sorry 2.66D makes the RAM run at or about 1066

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