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7900GS 1.55 Volt Mod, Volt fluctuating???

post #1 of 5
Thread Starter 
I already have 2 thread going about My 7900GS/Intel P4 heat sink mod.... but I'm experiencing a weild 1.55V/1.56V fluctuation.

http://www.overclock.net/cooling-exp...0gs-video.html

http://www.overclock.net/nvidia/1903...nk-7900gs.html

This morning I increased the Voltage to 1.55v and I'm running ATI tool, I think I found my max core at 717Mhz, I haven't had any errors for almost 10 minutes. I'll probably bring it down to 705 Mhz or 710Mhz to make certain I don't have any gaming problems. My max temp is 62c... one thing I nodiced is that ATItool heats up the core a lot more then any games I've played so far, the max temp I've seen while gaming was arround 50 to 55c.


The weird thing is that my core voltage is fluctuating from 1.55v to 1.56v??? has any one experienced this? When I initially increased my voltage incrementally from stock 1.2v to 1.4v and then to 1.5v, the voltage was fully stable.... I'm not sure if this fluctuation will cause problems ??????
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 
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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
(13 items)
 
  
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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post #2 of 5
doubt it, thats barely a voltage fluctuation at all. i wouldn't worry about it. btw was it easy to volt mod it? is it using the method with the conductive pen and voltimeter?
post #3 of 5
Thread Starter 
I think found out why the core volts is fluctuating, it seems that when the video card is under load the volts will increase. I re-mesure it after running ATItool for 1/2 an hour and the Volt it up to 1.62v... but was stable at 1.62.

I closed ATItool and waited 5 to 10 minutes and the Volt went back down to 1.57/1.58.

I did followed the circuit pen volt mod procedure, but I used a window defogger repair kits instead, it was a lot cheaper only (8$) and works just as well or better. I dipped a tooth picks in the tiny jar and could easily trace the lines. I actually cut the tooth pick in an angle.

So far, I'd recommend this modification to any one with a 7900GS video card.

I haven't done the memory mod yet..... so I can't really comment on that for now.
My AMD/ATI build
(13 items)
 
  
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 
  hide details  
Reply
My AMD/ATI build
(13 items)
 
  
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 
  hide details  
Reply
post #4 of 5
Thread Starter 
We’ll it looks like I hit a bottle neck with my over clocking, after I increased the core voltage from 1.5v to 1.55, I went from 685Mhz core to 710Mhz (fully stable)
I ran 3dMark2006 and scored 5264(at 1.55v), previously I scored 5221 (at 1.50v).

Is my bottle neck do the memory not being Volt modded or is it my CPU? I’ve read that once your close to 700Mhz or you go over 700Mhz you have to mod the memory to take full advantage.

I don’t have any memory heat sinks on my video card, but I touched the memory chips with my finger during one of the most graphical intensive part of 3dMark2006 and they were barely warm to the touch.

I have a 12cm fan blowing air directly on them…. do you guys think I should try the volt mod and see where it takes me?
My AMD/ATI build
(13 items)
 
  
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 
  hide details  
Reply
My AMD/ATI build
(13 items)
 
  
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 
  hide details  
Reply
post #5 of 5
Thread Starter 
We'll... I went ahead with the memory volt mod any way’s, I couldn't resist. The RAM chips we not even warm when gaming or bench marking 3dmark2006. With a huge intel P4 heat sink and a 12cm fan right bellow I don't think I'll have any problems.

My old ATI x800GTO video card RAM chips used to get boiling hot and I never had any issues.

Is there an easy way of keeping an eye on the RAM chip temperature? would a regular thermometer do the job? or is there an on board sensor on these NVIDIA 7900GS video card?
My AMD/ATI build
(13 items)
 
  
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 
  hide details  
Reply
My AMD/ATI build
(13 items)
 
  
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 
  hide details  
Reply
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