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Thread: Running 7850 HD on crossfire on GA-X48-DS4 and E8400/Q9550




  1. #1
    cynicoren is offline Junior Member
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    Default Running 7850 HD on crossfire on GA-X48-DS4 and E8400/Q9550

    Hello,

    My sys is 8GB ddr2, GA-X48-DS4 mobo and Intel E8400 CPU, with a single 7850HD GPU.
    1. Someone told me that the CPU bottlenecks the GPU. Is that correct ?
    2. If it is, what can solve this - OCing the CPU ?
    3. I found a used Q9550 cpu - will it solve the supposed bottle-necking issue, and moreover, can it fully support 2X7850HD (crossfire) ?


    Thank you

  2. #2
    profJim's Avatar
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    Default Re: Running 7850 HD on crossfire on GA-X48-DS4 and E8400/Q9550

    A bottleneck depends on several factors including screen resolution, in-game quality settings, and which games you are playing.

    Using a moderate or high cpu overclock should help minimize or eliminate cpu bottlenecks.
    Using a Q9550 instead of an E8400 should help to lower or eliminate possibe bottlenecks.

    Overclocking your video cards for better performance might aggravate a cpu bottleneck.

    I checked several HD 7850 CrossfireX reviews but all of the reviews used newer very high end processors, motherboards and memory.
    It seems that video card reviews always use high end processors to prevent a cpu bottleneck that would lower the video card's performance.

    I'm not a gamer, but several years ago I ran quite a few video benchmarks with my overclocked MSI N460GTX Hawk video cards with overclocked mid-range Core2 Duo processors and did not have any issues with bottlenecks. My results were very close to newer more powerful systems using the same video cards. Your video cards are a couple of steps higher than my video cards. The link to my MSI overclocking thread is in my signature.

    You will need excellent case cooling and cable management with a dual card setup.

    Your 620 watt power supply is probably adequate with an overclocked cpu and video cards.
    It's best when the power supply's output is less than 80% of its rated output when gaming for extended periods of time.

    A web search using: gpu vs cpu bottleneck should provide additional useful information.
    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
    .


  3. #3
    profJim's Avatar
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    Default Re: Running 7850 HD on crossfire on GA-X48-DS4 and E8400/Q9550

    Here is the first of several benchmarks with my Q9550 at 4.20 GHz:
    NVIDIA GeForce GTX 460 video card benchmark result - Intel Core 2 Quad Processor Q9550,Gigabyte Technology Co., Ltd. EP45-UD3P



    The overall score is about 1000 points higher than the original overclocked score using a Pentium Dual Core E6300 (R0) setup.


    This shows some of the MSI AfterBurner logging statistics for this test:



    To make the graphs more readable, several graphs are not displayed.
    The bottom graph shows the cpu usage results for the Cpu1 core.
    The graphs for the other three cores were similar to the first core.


    You can view my original 3DMark11 single card results at MSI N460GTX Hawk (1GB) Overclocking Results, post #5.

    ~~~~~~~~~~~~~~~

    These results are from MSI N460GTX Hawk (1GB) Overclocking Results, post #125 on October 11 2011:

    3DMark11 SLI Benchmark Results
    New cpu (E6850) running at 3.30 GHz.
    These 3DMark scores are ~1000 points higher than a single Hawk video card on the original P35-DS3L system
    with an E6300 (R0) cpu running at 3.60 GHz.
    Additional Unigine Heaven and STALKER - Call of Pripyat SLI tests will be posted soon.

    Last edited by profJim; 12-12-2014 at 02:19 AM.
    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
    .


  4. #4
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    Default Re: Running 7850 HD on crossfire on GA-X48-DS4 and E8400/Q9550

    Also depends on the games ur playing, some are more CPU dependent than others

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