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7900GT/GS at 1.7V GPU mod - Page 2

post #11 of 15
Thread Starter 
Just installed that heat sink on the two chips... I'm scanning for artifacs with ATItool... its only been two minutes and the heat sink is already hot!
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post #12 of 15
Thread Starter 
Quote:
Originally Posted by thestef View Post
I'm at home sick today... so what the heck! I measured the stock resistance on the chip and it was around 86 or 89KOhm, can't remember exactly. I brought it down to 45Kohm with pencil graphite.

It didn't help... same GPU OC as before. I guess this modification is only needed when going over 1.55v. I'm still going to run a bench mark to see if it helped.

I touched the small chips that supposedly get really warm when volt moding the ram.. OMG!! I almost burned my finger.

I think I'll steal one of my Motherboard ram heat sinks and install it on the video card pronto!

Actually this mod did do 1 thing, it seems to have brought up my GPU temp by another 2 or 3 degree's.
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post #13 of 15
Interesting... I think they did say that modding that resistor to 45k essentially served to provide more power to the core to support the higher voltages, so I guess it makes sense that it could increase your core temp if that is the case.

I was looking for some heatsinks for those chips and these look like they would be pretty good. I just don't want to pay $15 for them. I may see if I can get some at a B&M store or poach a heatsink from something else...

Here is the company website. Just look for "air cooling" and "mc21".

I guess a slight problem is that the airflow on the back side of the card is pretty weak, unless you are getting good flow from the case fans or the CPU fan. I think mine is probably not that great. Oh well...
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post #14 of 15
Thread Starter 
Yeah, I stole one of my small RAM heat sinks I had on my motherboard, the 2 way tape is still sticky. I also have a spare 4cm fan lying around in my desk. I'll just set it up beside the heat sink, I'll use a tiny bit of crazy glue to glue the fan on the video card, just a drop should do.... that way I can remove the fan and heat sink in case I need to RMA my video card.
My AMD/ATI build
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AMD FX-8350 (4..60Ghz) Gigabyte 990FXA-UD5 XFX R9-290 G.SKILL 8GB DDR3-1600Mhz 7-8-7-24 
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OCZ Vertex 2 Windows 7 Home 42 Inch Panasonic 1080p Plasma Antec Truepower 750W 
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My AMD/ATI build
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CPUMotherboardGraphicsRAM
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post #15 of 15
Thread Starter 
I installed the Heat sink and a 4cm fan beside the heat sink to cool down the chip that get really hot after a memory volt mod.

I read that it’s actually 2 chips, they are right next to each other so I installed the heat sink both of the chips, (they are small chips but get extremely hot with the memory volt mod) I then installed the 4 cm fan with a touch of crazy glue on the corning of the video card.

Here is a pic
My AMD/ATI build
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My AMD/ATI build
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CPUMotherboardGraphicsRAM
AMD FX-8350 (4..60Ghz) Gigabyte 990FXA-UD5 XFX R9-290 G.SKILL 8GB DDR3-1600Mhz 7-8-7-24 
Hard DriveOSMonitorPower
OCZ Vertex 2 Windows 7 Home 42 Inch Panasonic 1080p Plasma Antec Truepower 750W 
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