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Thread: RAM OC screwing with graphics




  1. #1
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    Default RAM OC screwing with graphics

    OK, I've posted about my graphics card acting up earlier, but I just can't seem to figure out how to fix this! Whenever I try overclocking my memory, I get artifacts! I used to get the same problems overclocking my CPU, but I'm guessing that was due to my RAM getting overclocked as well.. I tried setting my RAM to the same frequency as my CPU, 260MHz, but that didn't work out. At the moment I'm forced to use a divider, it's running at approx. 235 MHZ. Ordinarily this wouldn't have been a big deal, but I didn't buy a pair of OCZ Gold EL 3700 sticks just to be running them at stock speeds.
    I ran memtest for three passes (at 260 MHZ), no errors found. My board is only capable to raise the vdimm to 2.8V, but that should be enough for these sticks at these speeds, right? I've tried every parameter imaginable in the bios, but to no avail.

    Chieftec Bravo LBX01-B-B-SL
    580 W Hiper Type-R PSU

    Gigabyte GA-K8NXP-9 S.939
    AMD Athlon 64 Venice 3000+ at ~2470 MHz
    OCZ Gold EL PC 3700 Ram, 2.5-3-3-8 at ~456 MHz,
    2x512 MiB
    Gigabyte SilentPipe X800XL, 400/490 MHz
    Auzentech Digital X-Mystique 7.1CH DDL-RCE
    Logitech Z-5500 5.1 speakers
    1 x WD Caviar 8 MiB cache 1600JS-00MHB0 160GiB SATA-2
    3 x WD Caviar SE 16 MiB cache 2500KS-00MJBQ 250GiB SATA-2



  2. #2
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    Default Re: RAM OC screwing with graphics

    What do you mean you get artifacts when overclocking your system memory? Is this an AGP motherboard? Does it have a working AGP/PCI bus lock if it is? Something else is going on if overclocking the system messes with your video.
    GIgabyte GA-990FXA-UD3
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  3. #3
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    Default Re: RAM OC screwing with graphics

    I think casecutter may have hinted around your problem. Some motherboards support locking the AGP or PCI-E busses to their default levels even when you overclock the memory. I don't know offhand of your board supports this, but it is a good chance that it is the cause of your problems. On older systems and systems that don't support a locking of the bus handling the video, when you overclock the memory you also overclock the bus that runs the other peripherals. You need to see if you can lock the AGP or PCI-E bus (whichever applies to you) to its default speed. This will allow you to overclock the memory and system bus without causing any bus increases for the video bus.

    Good luck.
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  4. #4
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    Default Re: RAM OC screwing with graphics

    My graphics card is on PCI-e. And yes, I've been told this before, and I have been trying to lock the PCI-e bus but either it's malfunctioning or the option is not there... the only setting I've seen is "PCI-E frequency", which is set at 100 MHz. I'm really starting to regret getting this mobo...
    I could upload some picks of my BIOS, maybe you can find something I can't?
    Last edited by ifander; 08-05-2006 at 09:36 PM.

    Chieftec Bravo LBX01-B-B-SL
    580 W Hiper Type-R PSU

    Gigabyte GA-K8NXP-9 S.939
    AMD Athlon 64 Venice 3000+ at ~2470 MHz
    OCZ Gold EL PC 3700 Ram, 2.5-3-3-8 at ~456 MHz,
    2x512 MiB
    Gigabyte SilentPipe X800XL, 400/490 MHz
    Auzentech Digital X-Mystique 7.1CH DDL-RCE
    Logitech Z-5500 5.1 speakers
    1 x WD Caviar 8 MiB cache 1600JS-00MHB0 160GiB SATA-2
    3 x WD Caviar SE 16 MiB cache 2500KS-00MJBQ 250GiB SATA-2



  5. #5
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    Default Re: RAM OC screwing with graphics

    try downloading ClockGen from CPUID. That will show you the system bus speed AND the PCI-E bus speed. If the PCI-E bus is not staying at 100MHz then that is most definitely your issue.

    http://www.cpuid.com/
    GIgabyte GA-990FXA-UD3
    AMD FX8120 @ 4GHz
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    Powercolour HD 6970 2GB w/XFX 8800GT 512MB Hybrid PhysX
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  6. #6
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    Default Re: RAM OC screwing with graphics



    I'm really lost here... what could be causing this artifacting? When I lower the ram oc, everything is fine. Otherwise, I get these annoying glitches, especially when I play back video. I haven't even tried playing any games, I can guess at how that will turn out... Maybe I should try an older BIOS revision? I'm using the latest (F9).

    I ran some tests with the artifact tester in ati tray tools, and got a constant 1-3 artifacts, but when I ran a test with ATI Tool, I got no artifacts at all for some reason. I had the detection sensitivity at max.
    Last edited by ifander; 08-06-2006 at 12:59 AM.

    Chieftec Bravo LBX01-B-B-SL
    580 W Hiper Type-R PSU

    Gigabyte GA-K8NXP-9 S.939
    AMD Athlon 64 Venice 3000+ at ~2470 MHz
    OCZ Gold EL PC 3700 Ram, 2.5-3-3-8 at ~456 MHz,
    2x512 MiB
    Gigabyte SilentPipe X800XL, 400/490 MHz
    Auzentech Digital X-Mystique 7.1CH DDL-RCE
    Logitech Z-5500 5.1 speakers
    1 x WD Caviar 8 MiB cache 1600JS-00MHB0 160GiB SATA-2
    3 x WD Caviar SE 16 MiB cache 2500KS-00MJBQ 250GiB SATA-2



  7. #7
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    Default Re: RAM OC screwing with graphics

    Some A64 CPUs dont like higher memory clocks, the internal memory controler was a little unstable on some steppings. That board is not exactly known for high overclocks either. Other than that I am not exactly sure whats up yet.
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  8. #8
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    Default Re: RAM OC screwing with graphics

    Well, I'm pretty sure it's not the cpu, it's a Venice E3 stepping core, so unless I'm really unlucky, the problem lies elsewhere... My mobo btw is weird in more ways than one, for example, neither my temps nor my voltages make any sense other than my cpu and harddrive temps.. It shows my BIOS version to be F4 when in fact it's F9, and for some strange reason the SPD on my memory reports the following timing table for my ram:


    It's supposed to be 2,5-3-3-8.
    Some more in case you're interested:



    Chieftec Bravo LBX01-B-B-SL
    580 W Hiper Type-R PSU

    Gigabyte GA-K8NXP-9 S.939
    AMD Athlon 64 Venice 3000+ at ~2470 MHz
    OCZ Gold EL PC 3700 Ram, 2.5-3-3-8 at ~456 MHz,
    2x512 MiB
    Gigabyte SilentPipe X800XL, 400/490 MHz
    Auzentech Digital X-Mystique 7.1CH DDL-RCE
    Logitech Z-5500 5.1 speakers
    1 x WD Caviar 8 MiB cache 1600JS-00MHB0 160GiB SATA-2
    3 x WD Caviar SE 16 MiB cache 2500KS-00MJBQ 250GiB SATA-2



  9. #9
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    Default Re: RAM OC screwing with graphics

    As for the SPD values, OCZ does that often to help with boards that cannot set tight timings for default. Other than that, the memory overclock should not be effecting the video so I am beginning to believe that the mobo is just not meant for serious clocking.
    GIgabyte GA-990FXA-UD3
    AMD FX8120 @ 4GHz
    Patriot 1866MHz EL series 2X4GB DDR3
    Powercolour HD 6970 2GB w/XFX 8800GT 512MB Hybrid PhysX
    Creative X-FI titanium HD w/Technics class A 300W amp and tower speakers
    PC P&C 500W PSU
    2TB Seagate
    Coolermaster 690II w/Corsair H100 tucked under the hood

  10. #10
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    Default Re: RAM OC screwing with graphics

    Quote Originally Posted by casecutter
    ...the memory overclock should not be effecting the video so I am beginning to believe that the mobo is just not meant for serious clocking.
    Yeah I suspected as much...
    Oh well, it was worth a shot. It's just that I've never seen any reviews where they have had such problems...
    Thanks anyway
    Last edited by ifander; 08-06-2006 at 11:37 PM.

    Chieftec Bravo LBX01-B-B-SL
    580 W Hiper Type-R PSU

    Gigabyte GA-K8NXP-9 S.939
    AMD Athlon 64 Venice 3000+ at ~2470 MHz
    OCZ Gold EL PC 3700 Ram, 2.5-3-3-8 at ~456 MHz,
    2x512 MiB
    Gigabyte SilentPipe X800XL, 400/490 MHz
    Auzentech Digital X-Mystique 7.1CH DDL-RCE
    Logitech Z-5500 5.1 speakers
    1 x WD Caviar 8 MiB cache 1600JS-00MHB0 160GiB SATA-2
    3 x WD Caviar SE 16 MiB cache 2500KS-00MJBQ 250GiB SATA-2



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