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Thread: Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?




  1. #1
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    Question Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?

    Specs in sig.

    Currently I have a 400Mhz FSB -> x 2.00D multiplier for 800 Mhz RAM speed.
    I tried a 445Mhz FSB with the same settings (save for higher Vcore voltage) and the system does not boot under those conditions. Am I stuck at 3.60Ghz until I get faster RAM or can I (possibly) tweak my BIOS settings (voltages, RAM) to get a stable OC?

    Thank you in advance.
    > Power Supply: OCZ Fatal1ty OCZ700FTY 700W ATX12V
    > Mainboard: GA-EP45-UD3R (F6 BIOS)
    > Chipset: Intel P45
    > Processor: Intel Core 2 Duo E8400 3.00 @ 3.60Ghz (400*9)
    > CPU HeatSink and Fan (HSF): ThermalTake V1
    > Physical Memory: OCZ Gold Series 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Link
    > GFX Card : XFX HD-489A-ZDFC Radeon HD 4890 1GB 256-bit DDR5 PCI Express 2.0 x16
    > DVD-Rom Drive : LG SuperMulti GH22
    > Monitor Type : Samsung SyncMaster P2070
    > Operating System : Windows Vista Ultimate 64bit

  2. #2
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    Default Re: Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?

    You're very unlikely to get a 4GHz OC with 8GB of ram installed.Try 2x2 to see if you can do better... People have been easily getting 3.8GHz without breaking a sweat -- most have 4GB (2x2GB) ram installed.
    Gigabyte EP45-U3DP, rev 1.1, F8 BIOS
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  3. #3
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    Default Re: Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?

    I see. Would you mind explaining why 8gb of RAM would be an issue?
    > Power Supply: OCZ Fatal1ty OCZ700FTY 700W ATX12V
    > Mainboard: GA-EP45-UD3R (F6 BIOS)
    > Chipset: Intel P45
    > Processor: Intel Core 2 Duo E8400 3.00 @ 3.60Ghz (400*9)
    > CPU HeatSink and Fan (HSF): ThermalTake V1
    > Physical Memory: OCZ Gold Series 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Link
    > GFX Card : XFX HD-489A-ZDFC Radeon HD 4890 1GB 256-bit DDR5 PCI Express 2.0 x16
    > DVD-Rom Drive : LG SuperMulti GH22
    > Monitor Type : Samsung SyncMaster P2070
    > Operating System : Windows Vista Ultimate 64bit

  4. #4
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    Default Re: Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?

    It might be doable. First you have test your memory to see if it can handle 445 with 4 sticks. Drop your multi down to 6.5 and increase the fsb to 445 to yield only a 2.892ghz speeds. This way the cpu should not be the bottleneck. Experiment with loosening your memory timings and increasing vdimm, and possible mch combinations to see if you can run stable at the 445. If the memory is stable at 445, then keep those memory timings and move your multi back up to 9 and then reduce your fsb back to say 410, 420, 430,440,445, keeping 2.00D. You may have to adjust cpu and mch voltages accordingly to help with the process as you progress to your goal.

    Good luck.
    1) Gigabyte EP45-UD3P (rev 1.1, bios F9) E8400 @445x9@1.2625v bios, TRUE 120, Scythe UltraKaze 44cfm, 4x2gb GSkill 8500, Visiontek 3870, Corsair TX850, Antec 900, Win7-64 Home.
    2) Gigabyte EP45-UD3P (rev 1.1, bios F9) E8400 @500x8.5@1.2875v bios, TRUE 120, Schythe UltraKaze 44 cfm, 4x2gb Buffalo FireStyx 8500, XFX 5770, Corsair AX850, CM Scout, WinXP Pro/Win 7-64 Home.
    3) Gigabyte P55A-UD4P (rev 1.0, bios F5) i5 750 @190x20@1.30625v bios, CM Hyper 212+, 4x2gb G.Skill Ripjaw 1600, 7900GS, Corsair TX750, CM Scout, Win7 Pro-64.
    4) Asus P8Z68-V Pro (bios 0801), i5-2500K @44x100@1.248v cpuz, Megahalem rev.B, 4x4gb GSkill Sniper 1600, Corsair AX850, Antec 902, Corsair Performance 3 128GB, Win7-64 Home.


  5. #5
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    Default Re: Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?

    TranceFat and BBS both have some good points.

    Sometimes there can be difficulty getting 8GB of say 1066 RAM running at full speed, let alone overclocking 8GB of DDR800. It is all to do with how much strain the large ammount of RAM, and having all 4 slots populated puts on the MCH.

    Getting your RAM to DDR890 shouldn't be much of a problem. I've had 2 sticks of Corsair DDR800 (5-5-5-18) to 926 stable as. The sheer amount may hinder you, but it's not exactly a huge speed leap so should be OK

    After following BBS's suggestion about lowering multi, You could try the following to hopefully get 4GHz, then tweak it a little for stability. This depends on you having an E0 stepping of the E8400 which you can find out by running CPU-Z.

    Code:
    Robust Graphics Booster.....................[ Auto ] 
    CPU Clock Ratio.............................[ 9 ] 
    Fine CPU Clock Ratio........................[ 0.0 ] 
    CPU Frequency 4.0GHz........................[ 445*8.5 ] 
    
    ******Clock Chip Control****** 
    
    CPU Host Clock Control......................[Enabled ] 
    CPU Host Frequency (Mhz)....................[445] 
    PCI Express Frequency (Mhz).................[100 ] 
    C.I.A 2.....................................[Disabled] 
    
    ******DRAM Performance Control****** 
    
    Performance Enhance.........................[ Turbo ] 
    Extreme Memory Profile (XMP)................[Disabled] 
    (G) MCH Frequency Latch.....................[ 400MHz ] 
    System Memory Multipler.....................[ 2.00D ] 
    
    DRAM Timing Selectable......................[ Manual ] 
    
    CAS Latency Time............................[ 5 ] 
    tRCD........................................[ 5 ] 
    tRP.........................................[ 5] 
    tRAS........................................[ 18 ] 
    
    ******Advanced Timing Control****** 
    
    tRRD........................................[4 ] 
    tWTR........................................[4 ] 
    tWR.........................................[8 ] 
    tRFC........................................[68] 
    tRTP........................................[4 ] 
    Command Rate (cmd)..........................[2] 
    
    Set Static tRead in next menu to 9 initially. Do this for BOTH Channels, and increase Driving strength to 1066, also for BOTH channels.
    
    ******Motherboard Voltage Control****** 
    
    Load-Line Calibration [Enabled] 
    CPU Vcore [ 1.25 ]...............[ 1.3500 ] < May need more, or less. 
    CPU Termination [ 1.20 ]...............[ 1.28 ] 
    CPU PLL [ 1.50 ]...............[ 1.570 ] 
    CPU Reference [ 0.760 ]...............[ Set CPU Term to 1.200V, then set this to 0.760V than adjust CPU term back up ] 
    
    MCH Core [1.1 ]...............[ 1.26 ] <May need more as you have 8GB ram, up to 1.34V is safe and cool.
    MCH Reference [0.760 ]...............[ Set CPU Term to 1.2V then set this manually to 0.720V, then re-set CPU term ] 
    MCH/DRAM Refernce [0.900 ]...............[ Auto ] 
    ICH I/O [1.500 ]...............[ Auto ] 
    ICH Core [1.100 ]...............[ Auto ] 
    
    DRAM Voltage [1.800 ]...............[ 1.9V ] 
    DRAM Termination [0.900 ]...............[ Auto ] 
    Channel A Ref [0.900 ]...............[ Auto ] 
    Channel B Ref [0.900 ]...............[ Auto ] 
    
    ******Advanced BIOS Features****** 
    
    CPU Multithreading..........................[ Disabled ] 
    Limit CPUID Max to 3........................[ Disabled ] 
    No-Execute memory Protect...................[ Disabled ] 
    CPU Enhance Halt (CIE)......................[ Disabled ] 
    C2/C2E State Support........................[ Disabled ] 
    C4/C4E State Support........................[ Disabled ] 
    CPU Thermal Monitor.........................[ Enabled ] 
    CPU EIST Function...........................[ Disabled ] 
    Virtualization Technology...................[ Disabled ] 
    __________________ 
    __________________
    You may need to give your RAM even more than 1.9V to get these speeds, however it will invalidate your warranty (Not that OCZ can really tell what voltage they were given unless you RMA them burned).
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  6. #6
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    Default Re: Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?

    Thank you all for the advice. Will give these steps a try. : )
    > Power Supply: OCZ Fatal1ty OCZ700FTY 700W ATX12V
    > Mainboard: GA-EP45-UD3R (F6 BIOS)
    > Chipset: Intel P45
    > Processor: Intel Core 2 Duo E8400 3.00 @ 3.60Ghz (400*9)
    > CPU HeatSink and Fan (HSF): ThermalTake V1
    > Physical Memory: OCZ Gold Series 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Link
    > GFX Card : XFX HD-489A-ZDFC Radeon HD 4890 1GB 256-bit DDR5 PCI Express 2.0 x16
    > DVD-Rom Drive : LG SuperMulti GH22
    > Monitor Type : Samsung SyncMaster P2070
    > Operating System : Windows Vista Ultimate 64bit

  7. #7
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    Default Re: Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?

    I had 8 gb of the same memory as you and it can be done but you likely will need to fine tune your secondary timings and add more MCH volts as well.
    With all four memory slots occupied it puts more strain on the MCH.
    Last edited by Prospector; 06-08-2009 at 10:52 AM.
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  8. #8
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    Default Re: Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?

    If your system isn't stable with the previous suggestions, you might succeed with looser memory settings with the primary settings set to 5-6-6-18 (or 6-6-6-18) and the advanced timing control settings set to AUTO. Once your system is stable, you can then gradually lower settings and perform stress testing to ensure that your system is still stable.
    Q9650 @ 4.10GHz [9x456MHz]
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  9. #9
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    Default Re: Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?

    I would go auto on all "Advanced Timing controls". Once you get stable then tighten down the values.

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  10. #10
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    Default Re: Is it possible to OC E8400 to 4.00Ghz with PC2-6400 RAM?

    I would set them loose manually. Auto isn't infalable, and it's gotten it wrong many times on my system. 4-4-8-68-4 with tRead=9 should be plenty loose enough. By all means set 6-6-10-78-6 if it doesn't boot, but it shouldn't be needed in most cases.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
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