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Thread: GTX285 VGPU and OCP mod

  1. #1
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    GTX285 VGPU and OCP mod

    Here is the VGPU mod for nvidia GTX285 to start with, I will update the thread as soon as I have the OCP mod image done.

    I will also post some more info from our Tri-SLI benchmarking at CeBIT 2009.

    ! IMPORTANT INFORMATION !
    These mods have been tested, BUT I take no responsibility for how you use
    the mods and what happens to the card. Make sure the cooling is sufficient etc.
    The soldering order is crucial, make sure it's done exactly as the images show.


    Mod overview:

    Image copyright of W1zzard at www.techpowerup.com

    This is how it looks when soldered to the card.


    We ran 1.4V+ and no sign of OVP.

    OCP will trig at some point and here is the mod for that:


    Image copyright of W1zzard at www.techpowerup.com

    Please post at what frequencies it triggers for you with what type of cooling.
    Last edited by crotale; 03-15-2009 at 02:49 AM.

    "In mild doses, ethylene produces states of euphoria, associated with stimulus
    to the pleasure centres of the human brain."

    Intel benching: 3DMark Vantage: E69642, P37253, H30363, X22138
    Swedish Overclocking Champion 2006 - Celeron Mobile 1400 @ 4243MHz - 203%

  2. #2
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    wow, who's going to be the first to try this out?

  3. #3
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    Quote Originally Posted by Orangeblast View Post
    wow, who's going to be the first to try this out?
    I will probably be doing this mod for a friends 285 if the results are good from Crotale.

    If he really can do 900 mhz on the core, I may have to do this on my card too.
    Core I7 920 4.2 ghz (21x200) 1.35 volts / Asus P6T / Corsair XMS 1333mhz @ 1600mhz / EVGA GTX 285 SSC (724 core/1634 shaders / 1508 mem) / Modified ThermalTake Armor

    Swiftech Apogee, MCW-60, Swiftech 655, Black Ice GTX 360

  4. #4
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    Pencil Mod ??
    | Core i5 2500K + NH-U12P | Gigabyte P67A UD4 | 4096MB G.Skill 1600MHz | SLi NGTX 480 M2D15 | WD 500GB Raid 0 | SevenTeam 850 Z-AF |

  5. #5
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    I think 900 core would be a stretch with air or water. With LN2 it's another story. We were doing some quick single card tests at 1100/2200+ core/shader with around 1.4V, so the achitecture is capable of it.

    "In mild doses, ethylene produces states of euphoria, associated with stimulus
    to the pleasure centres of the human brain."

    Intel benching: 3DMark Vantage: E69642, P37253, H30363, X22138
    Swedish Overclocking Champion 2006 - Celeron Mobile 1400 @ 4243MHz - 203%

  6. #6
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    Quote Originally Posted by 8800's@over View Post
    Pencil Mod ??
    Please have a look at this thread for some pencil mods:

    http://www.xtremesystems.org/forums/...d.php?t=215224

    "In mild doses, ethylene produces states of euphoria, associated with stimulus
    to the pleasure centres of the human brain."

    Intel benching: 3DMark Vantage: E69642, P37253, H30363, X22138
    Swedish Overclocking Champion 2006 - Celeron Mobile 1400 @ 4243MHz - 203%

  7. #7
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    Is this some sort of voltage divider?

    Also nice Vantage scores What kinda clocks were you guys running for those?

  8. #8
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    Quote Originally Posted by Gautam View Post
    Is this some sort of voltage divider?

    Also nice Vantage scores What kinda clocks were you guys running for those?
    Exactly. I guess the 0 ohm resistor is there to simplify routing. Lucky for us

    Around 1000/2000/1400 core/shader/mem.

    "In mild doses, ethylene produces states of euphoria, associated with stimulus
    to the pleasure centres of the human brain."

    Intel benching: 3DMark Vantage: E69642, P37253, H30363, X22138
    Swedish Overclocking Champion 2006 - Celeron Mobile 1400 @ 4243MHz - 203%

  9. #9
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    Quote Originally Posted by crotale View Post
    Around 1000/2000/1400 core/shader/mem.
    Thanks crotale........

    I didn't have much time to start seaking for the mods (except the OCP triggering) and you've helped me with the VCore mod......

    1026/2267/1404 with 1.4VCore.....1.44V for 1058 core and 1.5V for over that at -102*C
    I haven't done the Vdimm mod yet....
    INTEL PWA FOR EVER

    Dr. Who my arss...

    .........



  10. #10
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    Quote Originally Posted by hipro5 View Post
    Thanks crotale........

    I didn't have much time to start seaking for the mods (except the OCP triggering) and you've helped me with the VCore mod......

    1026/2267/1404 with 1.4VCore.....1.44V for 1058 core and 1.5V for over that at -102*C
    I haven't done the Vdimm mod yet....
    Nice runs

    The shader was slightly more stubborn on the card we tried.
    1120/2200 has worked, but we had to lower the memory for those speeds.

    vmem rises slightly with vgpu and at some point we need to lower the mem clocks.

    *Updated the first thread with OCP*

    "In mild doses, ethylene produces states of euphoria, associated with stimulus
    to the pleasure centres of the human brain."

    Intel benching: 3DMark Vantage: E69642, P37253, H30363, X22138
    Swedish Overclocking Champion 2006 - Celeron Mobile 1400 @ 4243MHz - 203%

  11. #11
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    Have you seen George's mem clocks ?
    He's done GDDR3-1500 @ 3D Mark2001SE ( and without any Vmods for the memory like he said ) jeez.
    I tested a GTX 285 yesterday on LN2, and only managed to get it up to 1040/2106 ( GPU/SPs ) at -105C approx.
    About 1.45Vgpu
    Coding 24/7... Limited forums/PMs time.

    -Justice isn't blind, Justice is ashamed.

    Many thanks to: Sue Wu, Yiwen Lin, Steven Kuo, Crystal Chen, Vivian Lien, Joe Chan, Sascha Krohn, Joe James, Dan Snyder, Amy Deng, Jack Peterson, Hank Peng, Mafalda Cogliani, Olivia Lee, Marta Piccoli, Mike Clements, Alex Ruedinger, Oliver Baltuch, Korinna Dieck, Steffen Eisentein, Francois Piednoel, Tanja Markovic, Cyril Pelupessy (R.I.P. ), Juan J. Guerrero

  12. #12
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    thanks for sharing the mods crotale

    vmem mod: http://www.xtremesystems.org/Forums/...1&postcount=39
    Last edited by NapalmV5; 03-11-2009 at 02:22 PM.

  13. #13
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    Thanks for posting the mod crotale, excellent work.

    Quote Originally Posted by BenchZowner View Post
    Have you seen George's mem clocks ?
    He's done GDDR3-1500 @ 3D Mark2001SE ( and without any Vmods for the memory like he said ) jeez.
    I tested a GTX 285 yesterday on LN2, and only managed to get it up to 1040/2106 ( GPU/SPs ) at -105C approx.
    About 1.45Vgpu
    Some of these cards can hit 1500+ mem easily. Mine has no issues at those mem speeds, others seem to struggle or artifact though.

    Last edited by CryptiK; 03-12-2009 at 04:44 AM.
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  14. #14
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    Please report voltages, frequencies and cooling so we get some references.

    "In mild doses, ethylene produces states of euphoria, associated with stimulus
    to the pleasure centres of the human brain."

    Intel benching: 3DMark Vantage: E69642, P37253, H30363, X22138
    Swedish Overclocking Champion 2006 - Celeron Mobile 1400 @ 4243MHz - 203%

  15. #15
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    Don't look at the low score....It's because by old trusty PATA HD has failed during benching and I used a SATA one with only 120MHz PCI-E or the score whould have been 91k++ ...

    GPU = 1.41Volts
    Rams = default Voltage (I did't have the time nor the willing to mod it)
    -102*C


    INTEL PWA FOR EVER

    Dr. Who my arss...

    .........



  16. #16
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    need help...
    vgpu moded@1.35 solid color screen hang on DIRT even on default clock.ATItool 10mins OK
    if turn down to 1.22v everything fine.
    on water temp not an issue around 45-50 C only.
    would OCP help this ..?
    wat value to turn OCP vr ? how to indicate ?
    if over turned will fry my card .?
    Q66@3.4
    P35-DQ6
    GTX285 mod
    dell2405x2 a
    x-fi+mod
    OnkYoSE200+mod.

  17. #17
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    Quote Originally Posted by hehee View Post
    need help...
    vgpu moded@1.35 solid color screen hang on DIRT even on default clock.ATItool 10mins OK
    if turn down to 1.22v everything fine.
    on water temp not an issue around 45-50 C only.
    would OCP help this ..?
    wat value to turn OCP vr ? how to indicate ?
    if over turned will fry my card .?
    Solid color can be OCP.
    Try just soldering in a 100k VR as the OCP mod describes and see if it helps.

    "In mild doses, ethylene produces states of euphoria, associated with stimulus
    to the pleasure centres of the human brain."

    Intel benching: 3DMark Vantage: E69642, P37253, H30363, X22138
    Swedish Overclocking Champion 2006 - Celeron Mobile 1400 @ 4243MHz - 203%

  18. #18
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    Quote Originally Posted by crotale View Post
    Solid color can be OCP.
    Try just soldering in a 100k VR as the OCP mod describes and see if it helps.
    ya it's OCP .
    after added OCP mod no more solid hang screen.
    only 1.4vgpu ,check temp at the back of card power phase area lotsa heat.bout 85c on FURmark
    reduce to 1.35 for 24/7.
    thkz man you're great.
    Q66@3.4
    P35-DQ6
    GTX285 mod
    dell2405x2 a
    x-fi+mod
    OnkYoSE200+mod.

  19. #19
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    Thank you for sharing your mod crotale
    Quote Originally Posted by Gautam View Post
    I'll add my name to this elpida graveyard as soon I even think about running 32M. (yes, the thought is enough)



  20. #20
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    Quote Originally Posted by hehee View Post
    ya it's OCP .
    after added OCP mod no more solid hang screen.
    only 1.4vgpu ,check temp at the back of card power phase area lotsa heat.bout 85c on FURmark
    reduce to 1.35 for 24/7.
    thkz man you're great.
    What sort of clocks have you been able to get with the mod?

    How is the card cooled?
    Core I7 920 4.2 ghz (21x200) 1.35 volts / Asus P6T / Corsair XMS 1333mhz @ 1600mhz / EVGA GTX 285 SSC (724 core/1634 shaders / 1508 mem) / Modified ThermalTake Armor

    Swiftech Apogee, MCW-60, Swiftech 655, Black Ice GTX 360

  21. #21
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    Quote Originally Posted by CryptiK View Post
    Thanks for posting the mod crotale, excellent work.



    Some of these cards can hit 1500+ mem easily. Mine has no issues at those mem speeds, others seem to struggle or artifact though.

    Well, then I guess it's my bad luck once again.
    2 out 2 cards failed to hit anything higher than 1378 without artifacting, and would crash nearly instantly at anything over 1400.
    Coding 24/7... Limited forums/PMs time.

    -Justice isn't blind, Justice is ashamed.

    Many thanks to: Sue Wu, Yiwen Lin, Steven Kuo, Crystal Chen, Vivian Lien, Joe Chan, Sascha Krohn, Joe James, Dan Snyder, Amy Deng, Jack Peterson, Hank Peng, Mafalda Cogliani, Olivia Lee, Marta Piccoli, Mike Clements, Alex Ruedinger, Oliver Baltuch, Korinna Dieck, Steffen Eisentein, Francois Piednoel, Tanja Markovic, Cyril Pelupessy (R.I.P. ), Juan J. Guerrero

  22. #22
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    I assume this is the mod done on those 3 awesome 285s you had at CEBIT?
    Yes, Yellowbeard, a tall rough man with a big yellow beard

  23. #23
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    well believe it or not i had to ocp mod my unmodded 285 ftw/stock cooling

    again thanks for the ocp mod crotale

    air/even water cooling ocp mod is a must


    edit: if you guys want higher mem.. ocp mod will take care of that too

    ive gained 100mhz mem @ heavy load

    you want lower temps? ocp mod will do that too


    edit2: ive never been able to clock my ftw @ 1512 which would cause blank/black screens

    here i am @ 1548 mem clock @ heavy load thanks to the ocp mod

    overall 150+mhz mem gain @ heavy load @ stock air cooler

    once again thanks crotale for the mod
    Last edited by NapalmV5; 03-13-2009 at 04:35 PM.

  24. #24
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    Quote Originally Posted by Yellowbeard View Post
    I assume this is the mod done on those 3 awesome 285s you had at CEBIT?
    Hey Mike, yes they were

    Speaking of which, thanks for your support. The Dominators and the HX1000 served us well

    "In mild doses, ethylene produces states of euphoria, associated with stimulus
    to the pleasure centres of the human brain."

    Intel benching: 3DMark Vantage: E69642, P37253, H30363, X22138
    Swedish Overclocking Champion 2006 - Celeron Mobile 1400 @ 4243MHz - 203%

  25. #25
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    Quote Originally Posted by trueg50 View Post
    What sort of clocks have you been able to get with the mod?

    How is the card cooled?
    so far
    vgpu =-1.35v
    core 795/shader 1700/mem1450
    mcw 60 and ram sink
    Q66@3.4
    P35-DQ6
    GTX285 mod
    dell2405x2 a
    x-fi+mod
    OnkYoSE200+mod.

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