Memory Timings for Gf6800

Discussion in 'Videocards - NVIDIA GeForce' started by Phill-7, Apr 7, 2005.

  1. jimmor

    jimmor Ancient Guru

    Messages:
    4,526
    Likes Received:
    1
    GPU:
    EVGA8800GTS 512Mb
    NO !

    Timing strings used in 59xxx bioses are different values and structure from those used in 68xxxx bioses.

    However, a reasonable understanding of the structure and operation of the 6800LE/NU card/bios GPU Volts Lookup Table can be got from reading the GPU volts sections of my 59xxx bios moding guide.
     
  2. StealthBomber

    StealthBomber Member Guru

    Messages:
    109
    Likes Received:
    0
    GPU:
    Fully modded X1950GT
    You misunderstood me, when you increase latency there is always a chance you'll suffer a big performance hit at the same frequency, in this case there was none which is good news.

    Also my clocks are achieved via direct voltage and capacitor mods on the board itself, the 2.2ns Hynix chips are currently set @2.9v

    All I require is greater relaxed timings for T0, T1 and T2 to see if I can increase the current memory clocks without adding extreme cooling solutions or jacking up the voltage even higher. :)
     
    Last edited: Apr 21, 2005
  3. jimmor

    jimmor Ancient Guru

    Messages:
    4,526
    Likes Received:
    1
    GPU:
    EVGA8800GTS 512Mb
    Although I can understand why you might want to hard voltmod memory chip volts to 2.9, not sure I understand why you would want to hardmod GPU to 1.5v. The GPU overclock of 425 that your spec's show, would have been available from a bios 1.4v mod.

    However, since it is the 2.9 volts on 2.2ns memory chips that is probably a main factor with your current 945 overclock, then there is no reason why you shouldn't achieve better overclock with the timings I posted at page 1. Just like tonton who increased from 949 to 977 with his particular card/bios ?

    And not to be taken as being particularly directed at yourself; if people would just read my posts in this thread, they would see that, other than giving general help, I had no intention of turning this thread into my personal agenda of tuning everybodys different cards and bioses.

    I actually think it is better all round if more people throw in their experiences of what they have tried along with performance or otherwise achieved. And not just limited to benefits on changing things like timings, but maybe also from using different bioses. For example, I get more stable performance with my setup by not using Leadtek bioses.

    As I keep saying, all cards and bioses must be considered different, even when cards are from same manufacturer.

    :cool: :)
     
    Last edited: Apr 21, 2005
  4. StealthBomber

    StealthBomber Member Guru

    Messages:
    109
    Likes Received:
    0
    GPU:
    Fully modded X1950GT
    Like you said every card is different, just because your card can do 425 @1.4v does not mean its the same for everyone else, for my card 1.4v via bios mod only gives me a stable clock of 400MHz on the GPU, 1.5v is required for 425MHz. :)
     
    Last edited: Apr 21, 2005

  5. jimmor

    jimmor Ancient Guru

    Messages:
    4,526
    Likes Received:
    1
    GPU:
    EVGA8800GTS 512Mb
    Ok, but when you say 1.4v bios mod only gave 400, how did you achieve 1.4v bios mod ?

    Reason I ask is because 6800 bioses are usually supplied from manufacturer as having the 1.4v option in their GPU volts lookup tables set as "8C02", which actually sets GPU at 1.3v. So only way to get 1.4v option is by using hex editor to change the GPU volts lookup table 1.4v option to "8C03" !!!
     
  6. RBEJ

    RBEJ Member Guru

    Messages:
    156
    Likes Received:
    0
    Jimmor.What exactly have memory timings on your Leadtek A400LE card.

    PS.Sorry for my english........
     
  7. jimmor

    jimmor Ancient Guru

    Messages:
    4,526
    Likes Received:
    1
    GPU:
    EVGA8800GTS 512Mb
    At this point in time, my Leadtek A400LE is flashed with a Inno3D 6800NU bios with timings at,

    $0200100220 NV_PFB_TIMING0 : 060a150a
    $0200100224 NV_PFB_TIMING1 : 06010305
    $0200100228 NV_PFB_TIMING2 : 00240306
     
  8. StealthBomber

    StealthBomber Member Guru

    Messages:
    109
    Likes Received:
    0
    GPU:
    Fully modded X1950GT
    That is correct and I have in the past mentioned this in the xtremesystems forums, the 'VID - 2' option (in Nibitor) is incorrectly labelled 1.4v when infact the 'VID - 3 option' marked ?.?v is the correct setting.

    My card is volt modded with 100k pots and voltage changes on the GPU is verified using a multimeter on one of the GPU measuring points.

    BTW I'm using the Asus 6800GT 128MB bios (their hybrid card with DDR1 mem), I find the Asus bios far better than all of the Leadtek 6800LE/NU/GT/Ultra bioses I've tried.
    :cool:
     
    Last edited: Apr 22, 2005
  9. RBEJ

    RBEJ Member Guru

    Messages:
    156
    Likes Received:
    0
    Jimmor.This is my bios:

    http://rapidshare.de/files/1379371/a40014rv.rom.html


    Please,change my memory timings on your values:

    $0200100220 NV_PFB_TIMING0 : 060a150a
    $0200100224 NV_PFB_TIMING1 : 06010305
    $0200100228 NV_PFB_TIMING2 : 00240306

    Thankyou very much!!
     
  10. jimmor

    jimmor Ancient Guru

    Messages:
    4,526
    Likes Received:
    1
    GPU:
    EVGA8800GTS 512Mb

  11. RBEJ

    RBEJ Member Guru

    Messages:
    156
    Likes Received:
    0
    Thankyou,thankyou,thankyou.You are great!!
     
  12. Lyanna

    Lyanna Member

    Messages:
    16
    Likes Received:
    0
    GPU:
    Leadtek WinFast A400 TDH (GeForce 6800) 128 MB
    Jimmor, I've tried your current timings & also the further relaxed ones u gave for Phil-7, but those gave me no further clock for my GPU's mems. I also have used the one u gave for RBEJ and, still, gave me nothing. My current mem clock is 820, the furthest is 840 (w/ artifacts), w/ default BIOS's timings. Any suggestion?
     
    Last edited: Apr 23, 2005
  13. jimmor

    jimmor Ancient Guru

    Messages:
    4,526
    Likes Received:
    1
    GPU:
    EVGA8800GTS 512Mb
    I take it that you are using NiBiTor v2.1 and only changing the Timing0, Timing1 and Timing2 string values of Timingset6 ?

    And remember to use Rivatuner's Diagnostic Report to confirm that it is "Timingset6" for your particular card !!!

    Also just in case you are not changing your bios data properly, maybe you should try flashing with the timingset6 moded bios I made for RBEJ ?

    EDIT:

    Just flashed my A400LE with RBEJ moded bios, and, after setting speeds to 425/920 and unlocking pipes to 16x1,6vp, got a 3Dmark05 score of 5265. So for my card, the Timingset6 changes work ok !

    Are you unlocking all pipes on your card, and is your max memory overclock same with and without pipe mod. Maybe reason for artifacts at lowish overclock is due to faulty pipe ?

    And I assume that the mollex connection to your card is going directly to the PSU; and thus not shared with any other active devices ie HDD's, DVDROM, CDROM, etc. A good clean memory volts supply is crucial to overclocking.
     
    Last edited: Apr 23, 2005
  14. Lyanna

    Lyanna Member

    Messages:
    16
    Likes Received:
    0
    GPU:
    Leadtek WinFast A400 TDH (GeForce 6800) 128 MB
    Yes, Jimmor, I'm using NiBiTor v2.1 and only changed the Timing0, Timing1, and Timing2 string values of Timingset6, & after successful flash using WinFox 2, The RivaTuner's Dx Report confirmed the new timings. So, I'm very very confinced I've done it right. I've tried the BIOS u gave 2 RBEJ; I've checked it, twas the same w/ the timings u wrote in your thread, right? But, still, all my effort gave no change! My Gpu didn't success w/ unlocking the pipelines so it runs in 12x1, 6 vp. So, the artifacts showing in 840 mem clock is not from the faulty pipelines, am I right? w/ voltmodded BIOS to 1,4 V, it runs in 410 (max 425). So, Jimmor, have u figured what happen w/ my GPU?
     
  15. jimmor

    jimmor Ancient Guru

    Messages:
    4,526
    Likes Received:
    1
    GPU:
    EVGA8800GTS 512Mb
    Your conclusion that overclocking problem can't be related to faulty pipes is not quite correct, since any of the 12x1,6vp you are currently using could be faulty ?

    Also, you quote 12x1,6vp when you should actually have 12x1,5vp ?

    Just for interest, when you set bios for 1.4v on GPU, are you talking about the one I moded for RBEJ or your own original. Reason I ask is because the 1.4v option of original 6800NU bioses aren't properly able to give 1.4v on GPU. Bios is normally supplied with 1.4v option of gpu volts lookup table being "8C02" when in fact it should be "8C03".


    And the timing changes will have no effect on your cards GPU, they will only affect memory performance.

    Did you make sure that the mollex connection is on its own line to the PSU. Since as I previously said, good clean memory volts is crucial to good overclocking. Actual Memory volts can normally be measured at TP1 and TP10 on most 6800 cards.

    However, if it finally comes down to the fact that your particular card is using slowish memory chips (2.5-2.8ns), then you will never achieve same overclocks as many others, including myself, who have 2.2ns chips fitted to their cards.
     

  16. AION

    AION Master Guru

    Messages:
    410
    Likes Received:
    0
    GPU:
    Club3D HD3850 OC
    I´m just so curios to get a possibility to test these timings shown here.(unlucky, my MoBo fryed) I have GainWard 6800LE (with capasitator mod and 2.2ns chips on it). My core also goes 375MHz 16pipes 5vertexprocessors and I have 1.5Volts and NV5-silencer on it. My "original" voltage was set to 1.4Volts, is that usual to 6800LEs???
     
  17. Lyanna

    Lyanna Member

    Messages:
    16
    Likes Received:
    0
    GPU:
    Leadtek WinFast A400 TDH (GeForce 6800) 128 MB
    Yes, Jimmor, my GPU is set 12x1, 6 vp since unlocking the pipelines was unsuccessful; so, I only unlocked the vp; Yes, its orig/def setting was 12x1, 5 vp. And my GPU is set to real 1.4 V (8C03); I've confirmed w/ NiBiTor 2.1 & Riva's Dx Report; & I'm using the BIOS u gave 2 RBEJ anyway, not my own. So right now, my GPU is running in 12x1, 6 vp; core clock: 410, & mem clock: 820. I hope I can increase the mem clock. O ya, Jimmor, from what manufacturer was the BIOS u gave 2 RBEJ? And from what (else) manufacturers the BIOSes will be compatible w/ my GPU (Leadtek WinFast)? How can I know what kind mems (2.2, 2.5, or 2.8 ns) my GPU has?
     
    Last edited: Apr 24, 2005
  18. RBEJ

    RBEJ Member Guru

    Messages:
    156
    Likes Received:
    0
    Jimmor.Please tell me what memory timmings its tight for GeForce 6800NU.
    Give concrete samples.Thanks.

    PS.Sorry for my english....
     
    Last edited: Apr 24, 2005
  19. Lyanna

    Lyanna Member

    Messages:
    16
    Likes Received:
    0
    GPU:
    Leadtek WinFast A400 TDH (GeForce 6800) 128 MB
    Hai Jimmor. I just found out that Leadtek's BIOS for A400 (6800nu) v5.40.02.32.00 has diff timings; it's 060D1513/06010407/00240406 for Timing0-2 respectively. What is your opinion for this timings? Quite relax; more relax than yours; etc? Still, I can't set my mem clock further than 820 w/ this one.
     
  20. Lyanna

    Lyanna Member

    Messages:
    16
    Likes Received:
    0
    GPU:
    Leadtek WinFast A400 TDH (GeForce 6800) 128 MB
    Looks like I'm the only one who still active in this thread. Hey Jimmor, where r u?!? I have 2 threads that need your response.

    2 whom it may concern, my friend can set his mem clock up to 1100 MHz w/ timings0-2: 0B162B21/0E030D09/2527090D respectively, for timingset 6. But, 4 myself, those gave me no further mem clock than 820. (I started to think that my GPU will never be able 2 get OCed for it's memories.) To anyone who is willing 2 try this timings, would u please post me your result via this thread? Thanks
     

Share This Page