Overclock.net › Forums › Volt Mods › General Volt Mods › Graphics Cards Volt Mods › GPU mod log: chispy's GPUs; 8800GT, x2 8800GTS 640MB, 3870, & 3870x2
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GPU mod log: chispy's GPUs; 8800GT, x2 8800GTS 640MB, 3870, & 3870x2

post #1 of 25
Thread Starter 
This is a mod log for chispy. He generally does his own modding, but recently broke his hand. I've been glad to lend my hand for the mean time.




Just getting started with things tonight. First I unwrapped all the cards from their packaging and ran them through my test rig and preformed a quick power-on test to insure they all have video, which they all do. thumb.gif

More pics and modding to come.
    
CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
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CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
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post #2 of 25
Dat 3870x2 biggrin.gif

Can't wait to see what makes it tick.
    
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FX-8120, and a bunch more AM3/AM2+ Crosshair V, Crosshair IV Lots of green Dominator GT 
RAMRAMHard DriveCooling
Dominator GT Perfect Storm M4 64Gb Dihydrogen monoxide, Carbon dioxide, Liquid Nit... 
CoolingCoolingOSPower
OCN Marksman pot k|ngp|n F1 Dark pot Stripped Xp Antec 1200W HCP 
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CPUMotherboardGraphicsRAM
FX-8120, and a bunch more AM3/AM2+ Crosshair V, Crosshair IV Lots of green Dominator GT 
RAMRAMHard DriveCooling
Dominator GT Perfect Storm M4 64Gb Dihydrogen monoxide, Carbon dioxide, Liquid Nit... 
CoolingCoolingOSPower
OCN Marksman pot k|ngp|n F1 Dark pot Stripped Xp Antec 1200W HCP 
Case
Dimastech Hard 
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post #3 of 25
Thread Starter 
8800GT mod completed: vGPU, vMEM, OCP(vdroop), and vMeasures.




Notes for reference:
Stock:
vGPU 1.0v
vMEM 1.9v
OCP resistors 1.4 KOhm, after mod .648 Ohm
GPU resistance 14.6 Ohm, after mod 14.3 Ohm
MEM resistance .610 KOhm, after mod .592KOhm




The x2 is being saved for last. tongue.gif
    
CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
  hide details  
Reply
post #4 of 25
Thank you for the update Will thumb.gif , also thank you for helping me moding the cards , after the accident i cannot do it myself. Looking good. I think the Special Edition 3870x2 DDR-4 will be the icing on the cake , take care of her its one of a kind biggrin.gif. Have a good day bro.


Kind Regards: Angelo
post #5 of 25
Quote:
Originally Posted by PizzaMan View Post

8800GT mod completed: vGPU, vMEM, OCP(vdroop), and vMeasures.




The x2 is being saved for last. tongue.gif

I like the fact you left the warranty sticker on lol.
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R7 1700X 3912 Mhz @ 1.375v BIOSTAR X370GT7 eVGA GTX 1080 ACX 3.0  CORSAIR Vengeance White LED 3200 Mhz (4x8GB) 32GB 
Hard DriveHard DriveCoolingMonitor
256GB Samsung 850 Pro 1TB Samsung 850 Evo NZXT Kraken X52 Dell S2417DG 165Hz 1440p G-Sync 
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Razer Ornata Corsair 750 RM Phanteks Evolv ATX Logitech G602 
CPUMotherboardGraphicsRAM
i7 4790k @ 4.6Ghz Asus MAXIMUS VII GENE GTX 980 Ti @ 1400 Mhz 4 x 4GB (16GB) Corsair LPX DDR3 
Hard DriveHard DriveCoolingOS
240GB Seagate 1TB RAID HDD Cosair H240 Windows 10 
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Desktop!
(13 items)
 
Spare Gaming Rig
(11 items)
 
 
CPUMotherboardGraphicsRAM
R7 1700X 3912 Mhz @ 1.375v BIOSTAR X370GT7 eVGA GTX 1080 ACX 3.0  CORSAIR Vengeance White LED 3200 Mhz (4x8GB) 32GB 
Hard DriveHard DriveCoolingMonitor
256GB Samsung 850 Pro 1TB Samsung 850 Evo NZXT Kraken X52 Dell S2417DG 165Hz 1440p G-Sync 
KeyboardPowerCaseMouse
Razer Ornata Corsair 750 RM Phanteks Evolv ATX Logitech G602 
CPUMotherboardGraphicsRAM
i7 4790k @ 4.6Ghz Asus MAXIMUS VII GENE GTX 980 Ti @ 1400 Mhz 4 x 4GB (16GB) Corsair LPX DDR3 
Hard DriveHard DriveCoolingOS
240GB Seagate 1TB RAID HDD Cosair H240 Windows 10 
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post #6 of 25
Good stuff!
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For Sale: 6GHz+ 980X
$225 (USD) or best offer
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CPUCPUCPUCPU
Intel Pentium G3258 Intel QX9650 AMD FX 4300 Intel E2140 
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E4300 Asus Rampage Extreme / P5E3 Deluxe / Gigabyte X... MSI GTX 275 Lightning MSI HD 7970 Lightning 
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Kingston SSD Now! 128GB Patriot Torqx 2 32GB Seagate 80GB XPSC Rasa + EK VGA + HWLabs Black Ice GTX 360 +... 
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W7 Pro x64 SP1 Windows XP x86 SP3 W8.1 Ducky Shine 3, Cherry Brown Switches 
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Bench Stuffs
(32 items)
 
ITX Daily Driver
(11 items)
 
For Sale: 6GHz+ 980X
$225 (USD) or best offer
CPUCPUCPUCPU
Intel Core i7 920 Intel Xeon W3520 Intel Core i7 4770K Intel Core 2 Duo E8500 
CPUCPUCPUCPU
Intel Pentium G3258 Intel QX9650 AMD FX 4300 Intel E2140 
CPUMotherboardGraphicsGraphics
E4300 Asus Rampage Extreme / P5E3 Deluxe / Gigabyte X... MSI GTX 275 Lightning MSI HD 7970 Lightning 
GraphicsGraphicsGraphicsGraphics
Asus GTX 285 Matrix Platinum MSI HD 5870 Lightning EVGA GTX 980 TI Classified K|ngp|n Edition MSI GTX 580 Lightning 
RAMRAMRAMRAM
Corsair Dominator Platinum 2666 10-12-12 Samsung Corsair Dominator GT 2000 7-8-7 Hypers Kingston HyperX 2000 9-9-9 BBSE G.Skill Trident 2000 9-9-9 PSC 
Hard DriveHard DriveHard DriveCooling
Kingston SSD Now! 128GB Patriot Torqx 2 32GB Seagate 80GB XPSC Rasa + EK VGA + HWLabs Black Ice GTX 360 +... 
OSOSOSKeyboard
W7 Pro x64 SP1 Windows XP x86 SP3 W8.1 Ducky Shine 3, Cherry Brown Switches 
PowerCaseMouseMouse Pad
Corsair AX1200 Dimastech Easy V2.5! <3 Logitech G5 Battlefield 2142 Edition Puretrak Stealth 
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post #7 of 25
Thread Starter 
Now for the 8800GTSes. First up, chispy wanted OVP mod on these cards. There wasn't a known OVP mod worked for this card and I don't have the datasheets for this IC. Though, the Ultra uses the same Primarion controller. So I traced the Ultra's OVP mod point to the pin on the IC.

Ultra's mod point:


Retraced and mapped for the GTS:
    
CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
  hide details  
Reply
post #8 of 25
Sub'ed.

This is great, I love seeing chispy at work with modding and benching. I still have that EVGA 8800GTS SSC we traded for the 7800GTX's. Put it under water and use from time to time, still going strong!thumb.gif
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CPUMotherboardGraphicsHard Drive
i7 3970X Asus Rampage IV Extreme Sapphire R9 Fury Samsung 850 Pro 
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Windows 7 Pro x64 OCZ Gold 850W 
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Intel Xeon X5675 @ 4.6Ghz Asus Sabertooth X58 AMD Radeon R9 Fury Corsair XMS DDR3  
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OCZ Vertex 2 OCZ Vertex WD VelociRaptor LiteOn DVD/RW 
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Corsair H100i GTX Windows 7 Ultimate x64 Hanns-G 27" LED Razer BlackWidow Ultimate 
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OCZ 850W ZX Series Thermaltake Level 10 GT Razer DeathAdder 3500dpi Xtrac Ripper 
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Creative Soundblaster X-Fi 
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i7 3970X Asus Rampage IV Extreme Sapphire R9 Fury Samsung 850 Pro 
OSPower
Windows 7 Pro x64 OCZ Gold 850W 
CPUMotherboardGraphicsRAM
Intel Xeon X5675 @ 4.6Ghz Asus Sabertooth X58 AMD Radeon R9 Fury Corsair XMS DDR3  
Hard DriveHard DriveHard DriveOptical Drive
OCZ Vertex 2 OCZ Vertex WD VelociRaptor LiteOn DVD/RW 
CoolingOSMonitorKeyboard
Corsair H100i GTX Windows 7 Ultimate x64 Hanns-G 27" LED Razer BlackWidow Ultimate 
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OCZ 850W ZX Series Thermaltake Level 10 GT Razer DeathAdder 3500dpi Xtrac Ripper 
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post #9 of 25
Thread Starter 
Also, the OCP mod I had listed in the essentials thread is for the 512MB GPU. So I remapped for the 640MB cards.

    
CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
  hide details  
Reply
post #10 of 25
Thread Starter 
Completed the 8800GTS's. One of the GTSes let out a puff of smoke when I did a test after completing the vMeasure and OCP. Quickly turned off the power, double checked solder points, and inspected card. No visible burn marks or damage. Reinstalled and let it boot. Video looks fine and I went ahead and installed drivers, tested with ATItool, and the card it fine. Not sure what the smoke was from. Complete mystery.....

There is also a third measure point on the Molex. It's for measuring the OVP resistance.




Closeup of the OCP mods



Notes for reference:
Stock
OVP 5.22 KOhm
OCP 1.24 KOhm
GPU 33.4 Ohm
MEM .530 KOhm
vGPU 1.15v
vMEM 1.79v

Post mods: All VRs turned so that clockwise equals more voltage / lower resistance.
OVP 4.96 KOhm
OCP .614 KOhm
GPU 32.2 Ohm
MEM .479 KOhm
vGPU 1.19v
vMEM 1.97v/2.0v
    
CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
  hide details  
Reply
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Overclock.net › Forums › Volt Mods › General Volt Mods › Graphics Cards Volt Mods › GPU mod log: chispy's GPUs; 8800GT, x2 8800GTS 640MB, 3870, & 3870x2