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8800gt worklog

post #1 of 8
Thread Starter 
First post here, cheers.

I had been wanting to overclock my old 8800gt for a while now, I like to wait until my gear is old before pushing it because I'm cheap haha. The stock temps on my 8800gt were terrible, 62C idle, and 94C (and rising) on Furmark. In order to overclock this hot card I figured something had to be done about the temps. The following is my painfully honest work log of trying to do this for $0.

Preliminary step- Took the card out of my rig.

Attachment 189282

Step 1- I took off the stock heatsink.

Attachment 189283

As you can see there are a lot of chips that need cooling in there, not a surprise to me because of research. I was time to get out the hacksaw and make some little heatsinks.

Attachment 189284

I cut up some old chipset heatsinks from a P3 motherboard. I used the processor heatsink from the same board and did some 400/600/1000/2000 grit lapping. Once all these were lapped, and the GPU was cleaned I moved onto adhering these ghetto heatsinks to the card.

A note on how I did this, I first tried a 50/50 mix of thermal paste and 2 part epoxy. This was a mistake. I don't know what went wrong, because I've read that this works well, however there was no real adhesion from this mix and the heat transfer was terrible! Jumping ahead when I tested it the card shot up to 70C idle and 90C load instantly. Backing out from this I decided to just use epoxy and thermal paste separately. I used the thermal paste as it normally would be, and epoxied the heatsinks for a mechanical connection. In the end it looked something like this.

Attachment 189285

After the epoxy cured and I was comfortable hanging them all upside-down I zip tied 2 old 80mm fans and wired them in to a 12V line. Mounting the card back in my rig was interesting, but in it went.

Attachment 189286

Testing and overclocking to come. Idle temps have gone from 60C to 43C, so that is at least an improvement.

Comments appreciated.




post #2 of 8
Thread Starter 
Was able to get a 600MHz->700MHz core overclock and a 900MHz->1000MHz memory overclock out of Rivatuner. Furmark results work not stunning, I went from 34 average fps to 39 fps with a max load temp of 92C. Upon returning the card to default tuning, the max temp from Furmark was 88C. Overall the project turned out to be more fun to do, than performance increasing.
Edited by Roenox - 1/14/11 at 12:26pm
post #3 of 8
How are the load temps?
Finally an update
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7 7700k @ 4.8 MSI Z270 Pro Carbon Zotac GTX1060 6gb GSkill TridentZ 16gb (3200mhz) 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 960 Evo 500gb Samsung 850 EVO 250gb WD Blue 500gb x2 RAID0 ASUS DVDRW 
CoolingOSMonitorKeyboard
Thermalright Venemous-X Windows 10 Acer H257HU 1440p Razor Blackwidow 
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Finally an update
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7 7700k @ 4.8 MSI Z270 Pro Carbon Zotac GTX1060 6gb GSkill TridentZ 16gb (3200mhz) 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 960 Evo 500gb Samsung 850 EVO 250gb WD Blue 500gb x2 RAID0 ASUS DVDRW 
CoolingOSMonitorKeyboard
Thermalright Venemous-X Windows 10 Acer H257HU 1440p Razor Blackwidow 
PowerCase
Seasonic X650 Coolermaster Storm Scout 
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post #4 of 8
Thread Starter 
Well back to the drawing board today, I did something crazy. I epoxied together two P3 heatsinks back to back and then lapped on side of the monster, put on two shroud fans, and a third one on top because why not.





Barely got it back in my computer.



This has improved things a lot. I achieved a stable 600->750 core overclock and a 900-1050 memory overclock. Bumping my Furmark average fps from 35 to 42. The max stable temp after 4 mins was 75C. Quite a bit happier with these results, hope you have enjoyed the most ghetto thing I've ever thrown in a computer.
post #5 of 8
That card is tough look how bent it is in the pic. Nice work might do similar to my old 8800gts 320mb.
    
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WD 1TB SATA3 + 4TB Storage External USB Thermalright Archon Win 7 Pro x64 
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Samsung 27 inch LED 1920x1080 HD Logitech K120 Seasonic X-760 Modular Fractal Define R4 
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CPUMotherboardGraphicsRAM
AMD FX-8320 3.6GHz 1.152v Gigabyte 990FXA-UD5 EVGA GTX 960 SSC 4GB 8GB G. Skill DDR3-1333 CL9 1.5v 
Hard DriveOptical DriveCoolingOS
WD 1TB SATA3 + 4TB Storage External USB Thermalright Archon Win 7 Pro x64 
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Samsung 27 inch LED 1920x1080 HD Logitech K120 Seasonic X-760 Modular Fractal Define R4 
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post #6 of 8
Thread Starter 
Oh it bent alright, when turned upside-down it pretty much evens out. Made me nervous at any rate. Been running fine for the rest of the weekend.
post #7 of 8
Screenies of performance?
    
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Xeon w3680 Gigabyte X58A-UD3R GTX 295 Engineering Samples 2X Corsair XMS3 
Hard DriveHard DriveCoolingOS
Sandisk SSD Seagate Corsair H50 W7 Ult 
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Logitech M570 
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post #8 of 8
That's some crazy modding, however it does not look completely safe
Main rig
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Main rig
(18 items)
 
  
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Intel Core i7 6700K ASUS MAXIMUS VIII HERO MSI GTX 1080 Gaming X HyperX Fury DDR4 2133MHz 32GB  
Hard DriveHard DriveHard DriveHard Drive
Sandisk Ultra Plus 128GB SATA 3 Seagate Barracuda 2TB SATA 3 Samsung SpinPoint F1 1TB SATA 2 Toshiba Desktop 3TB SATA 3 
CoolingOSMonitorKeyboard
Noctua NH-D15S Windows 10 Pro 64bit ASUS PG279Q 1440p 165Hz IPS G-Sync Logitech G19 
PowerCaseMouseMouse Pad
Corsair AX 850W (I won it!) Corsair Carbide 500R White Rokkat Kone XTD+ Steelseries Fnatic Q-Pad 45x40cm 
Audio
Logitech G35 
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