occing my 7800gtx...what may be the problem?

Discussion in 'Die-hard Overclocking & Case Modifications' started by chris oO, Nov 6, 2005.

  1. chris oO

    chris oO New Member

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    GPU:
    Sapphire Radeon 9800 Pro
    hi!
    i just got a asus 7800 gtx and started occing.
    i tried as following:

    40mhz delta:

    490/1300 mhz (530 vertex, 486 rop)
    runs at 61°C under load with no artifacts

    at 500/1300 mhz (540 vertex, 513 rop)
    it runs at 62°C but i get artifacts. the temps are perfectly fine for load with air-cooling.

    so i tried again with 50 mhz delta:
    473/1300 mhz (523 vertrex, 486 rop)
    runs at 61°C under load with no artifacts

    at 490/1300 mhz (540 vertex, 486 rop)
    it still runs at 61°C under load but with artifacts.


    so what may be the problem with getting the artifacts? its not the memory, and its not the temp. i guess its the vertex hitting 540, but i tried with 30 mhz delta at 500/1300 mhz (530 vertex, 513 rop). runs at 62°C under load with artifacts.
    so it seems not to be the vertex, nor the rop.


    any ideas?

    i hope anyone can help.

    regards,

    chris
     
  2. phrozin

    phrozin Guest

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    GPU:
    EVGA GTX980
    After some playing around with 7800gtx's they are not the easiest things to over clock don’t get too caught up on the delta atm first establish where the card will work at over clocked, you haft to be on the ball with them when you increase clocks it doesn’t all way increase I found that every time you over clock them I had to save to apply at start up restart the comp to ensure they are actually over clocked. (not sure but I think its a driver thing)

    There are a few things you need to get around 1 is the cold throttling issue and 2 the memory protection when you increase the cards memory clock to far the card go's strait into throttle hence you only get artefacts some times, I use riva and force performance 3d I also increase the cards 2d clock to the maximum riva will allow me I did not find any benefit in a 50delta over a standard 40 delta also 60deg is no where good enough for over clocking you need to get that down a bit into the 40's but I will tell you, you are right its not the memory causing the artefacts it is the core temp get it down and your in business but anything under 31deg the card will cold throttle yeh there different all right.


    I have not got my head fully around them as of yet still finding my feet with them sorry I cant be of more help, I am in the same boat sort off but I have managed to get mine to 590/1350 on water anything passed that and the cards act up a bit but i am working on it
    :)
     
  3. otaku

    otaku Guest

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    GPU:
    8800,640gts sli
    wow 590?? help me out budy did you do this just in riva?
    im on water btw with 36 idle 42 load and i can only get to 535 core
     
    Last edited: Nov 6, 2005
  4. nutyo

    nutyo Ancient Guru

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    GPU:
    Sapphire Vapor-X HD5870
    590!? Crap you are almost at my 6600GT clock. I hit 596 the other day after being stuck at 592 for ages. I hope to break the 600 mark on air cooling. But on a gtx that is a massive clock.
     

  5. ViciousXUSMC

    ViciousXUSMC Banned

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    GPU:
    Geforce 7800GTX@497/1300
    Not all cards are the same, he just got a realllly good one.
     
  6. [Master]Sergio

    [Master]Sergio Active Member

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    GPU:
    Msi 7800gtx @ 500 -1370 22"IIyama
    I think:
    The higher the clock the less heat the core can take..
    Havent got my 7800gtx on water yet, but i remember my 6800gt doing 390 on air. Anything higher gave artifacts. After cooling it with water it could do 415 without artifacts.
     
  7. plac

    plac Master Guru

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    GPU:
    (2) BFG 8800 GT 512MB in SLI
    my BFG 7800gtx over clocks to 569 automatically if i enable it in settings. It gave me 500 marks over non-OC'ed 501 and under, but i did have lot of artifacts also.

    I have a new cooler to try tonight, and then i might see if that overclocking to 569 is safer.. if its just risky on this type of card, i might not bother... not like i'd notice 500 marks more in actual performance anyway.
     

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