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Thread: Z77 Pro3 with Gigabyte 7870 OC problem




  1. #1
    Maarsch is offline Junior Member
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    Default Z77 Pro3 with Gigabyte 7870 OC problem

    Hello Everybody,

    I have a similar problem to what I found here. There are some differences and the problem resolution, if any, was not posted there.

    My computer contains:
    ASRock Z77 Pro3 motherboard (BIOS 1.50, Serial# 26M0XD093436, part# 90-MXGM00-A0UAYZ)
    i5-3570 CPU Boxed (Ivy bridge)
    8 GB Corsair CMS3 DDR3-1600 DIMM CL9 Dual Kit
    2048MB Gigabyte Radeon HD 7870 OC Aktiv PCIe 3.0 x16 (Catalyst version 12.8, model name: GV-R7870C-2GD, SN: 123401007962)
    OCZ Agility 3 120 GB SATAIII MLC asynchron
    Thermaltake Smart M550W 80+
    LG Electronics GH24NS90 SATA DVD-burner
    and I run Windows 7 64-bit.

    The problem is that the card, which is a PCIe 3.0 card, does not run in the PCIe 3.0 slot. The BIOS does not even see it.
    When I plug it in the PCIe 2.0 slot it is detected by the BIOS and it runs.
    If I plug my friend's 4800 (or smthg) in there it is detected by the BIOS and runs.

    I have the latest BIOS intalled and my Gigabyte drivers are up to date (although that should not impact it not being detected by the BIOS).
    I can not disable the IGPU, I can only choose a preference setting for the primary display, which are: On-board, PCI Express and PCI.

    Anyone any suggestions?
    Last edited by Maarsch; 09-19-2012 at 12:13 AM. Reason: Added additional hardware info

  2. #2
    profJim's Avatar
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    Default Re: Z77 Pro3 with Gigabyte 7870 OC problem

    Send a PM (private message) to ASRock TSD - Emily, ask for her help and include a link to this thread.
    Update your PC Specs list to include model numbers and bios versions for all of your hardware.

    You will save yourself a lot of time and wasted effort if you completely list all hardware details in the PC Specs.
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  3. #3
    Maarsch is offline Junior Member
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    Default Re: Z77 Pro3 with Gigabyte 7870 OC problem

    OK cheers, updated and PMed

  4. #4
    Maarsch is offline Junior Member
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    Default Re: Z77 Pro3 with Gigabyte 7870 OC problem

    OK, I resolved the problem according to a method described in the post I first linked to.
    I'm pretty sure this option wasn't available on earlier BIOSes though as I did look for it. And I'm not rolling back my BIOS to find out.

    1.60 came with the option to turn "PCIE2 Link Speed" from auto to Gen1 and that did the trick. Or at least, the card is recognized by the motherboard, bios etc. I have yet to see what the impact on performance is. Is Gen1 a good setting or am I better off putting it back in the PCIe2.0 slot? (btw having your PCIe3.0 slot called PCIE2 and your PCIe2.0 slot called PCIE3 isn't the clearest thing in the world)

    So for anyone coming across this thread while searching for a solution for a similar problem:

    • Update BIOS
    • In BIOS go to "Advanced" screen -> North Bridge Configuration
    • Set "PCIE2 Link Speed" to Gen1


    You can mark this thread solved.

    Thank you for all your help.

  5. #5
    profJim's Avatar
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    Default Re: Z77 Pro3 with Gigabyte 7870 OC problem

    The common naming for pci-e slots is that the slot names have numbers that start with the first slot in the highest physical position on the motherboard and the slot number increases with each slot below the previous pci-e slot. The pci-e slot numbers have nothing to do with the slot bandwidth or physical/electrical type, such as x16, x8, x4 or x

    With a mid range video card, running with pci-e 1.x bandwidth might result in lower video performance in some situations, such as intensive gaming or video encoding. My older SLI system has pci-e 1.x bandwidth and running graphics benchmarks with two pci-e 2.0 GTX 460 cards in SLI, my scores are very close to more modern systems with more powerful processors that use one or two GTX 460 video cards.

    Recognizing video cards has been a common problem with many systems in the ASRock forum.
    Many of these problems were fixed with a newer bios or a special bios.
    PM ASRock TSD - Emily again and/or contact ASRock > Support Request Form online and provide a link to this thread.

    Let us know if/when you are provided with a permanent fix.
    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
    .


  6. #6
    Maarsch is offline Junior Member
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    Default Re: Z77 Pro3 with Gigabyte 7870 OC problem

    Do I understand the Gen1 thing correctly?

    Gen1 means PCIe 1.0?
    So I have a PCIe 3.0 * 16 card in a PCIe 3.0 * 16 slot and it only works on PCIe 1.0

    So I have 4 GB/s capacity where I should have 16 GB/s?

    My fps is half what it was with the card in the PCIe 2.0 slot.
    Last edited by Maarsch; 10-20-2012 at 12:59 AM.

  7. #7
    synack's Avatar
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    Default Re: Z77 Pro3 with Gigabyte 7870 OC problem

    PCI-e 1.0 x16 spec is 4GB/sec or 40GT/s

    gigabyte hd 7870 oc (1100Mhz) transfer rate= 4.4GB/s

    So you will lose .4GB/s of peak transfer. does that matter to you? You will most likely never reach that... but in theory you could.
    (mainly with large texture change loading)
    It shouldn't affect frame rate in any games currently out there.

    I would however find out if there is a firmware update for your video card. It seems to me, 90% of the time, the problem is fixed with an updated revision video card.
    Remember that PCI-E 3.0 is still fairly new and the kinks are still being worked out.

    Syn

  8. #8
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    Default Re: Z77 Pro3 with Gigabyte 7870 OC problem

    Quote Originally Posted by Maarsch View Post
    Do I understand the Gen1 thing correctly?

    Gen1 means PCIe 1.0?
    So I have a PCIe 3.0 * 16 card in a PCIe 3.0 * 16 slot and it only works on PCIe 1.0

    So I have 4 GB/s capacity where I should have 16 GB/s?

    My fps is half what it was with the card in the PCIe 2.0 slot.
    if you load gpu-z and click next to the pci-e1 question mark then click render,you should see it switch to pcie2 or pcie3 speeds depending on which slot your graphic card is in,it runs at pci-e1 speeds at idle/power saving mode

    btw the difference between pci-e2 and pci-e3 speeds is a mere 1%,so i wouldnt lose sleep over it
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  9. #9
    synack's Avatar
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    Default Re: Z77 Pro3 with Gigabyte 7870 OC problem

    Quote Originally Posted by wazza300 View Post
    if you load gpu-z and click next to the pci-e1 question mark then click render,you should see it switch to pcie2 or pcie3 speeds depending on which slot your graphic card is in,it runs at pci-e1 speeds at idle/power saving mode

    btw the difference between pci-e2 and pci-e3 speeds is a mere 1%,so i wouldnt lose sleep over it
    I think the OP meant setting the slot to PCIE1.0 in the bios to fix a compatibility issue.
    Do you think windows will crank the slot back up to 3.0 anyway? That would be pretty cool.

    I know my video card sits at 1.0 when idle, and cranks up to 3.0 when loaded, but my slot is set to 3.
    On second thought I can probably test that... my z77 oc is not that much different than the OPs z77 Pro3 (chipset wise anyway)

    Syn
    Last edited by synack; 10-20-2012 at 02:26 AM. Reason: added a thought

  10. #10
    synack's Avatar
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    Default Re: Z77 Pro3 with Gigabyte 7870 OC problem

    Well that was a quick and easy test.
    No the slot does not crank up to 3.0 when given an load, after setting the BIOS to "Gen 1" on the PCI-E slot. Well not on my board anyway.

    Syn

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