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Modifying a Stock Intel P4 Heatsink for a 7900GS?? - Page 4

post #31 of 41
Thread Starter 
Looks like a nice project da9pwnsu... I don't mean to comment, but your name its super hard to remember lol

I saw your original post about your project, all I have to say is ... just do it! If this will motivate you, I only used basic tools to do my mod, nothing special, a hack saw, a drill, a Philips screw driver, an exactor knife, a pair of vice grips and 4 small screws and bolts to mouth the heat sink to the video card, artic 5 thermal paste and fine sand paper for the lapping job. (all stuff I already had) When I posted my idea and got skeptical feed back this just motivated me even further to accomplish my mod.

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.

One really weird thing I should mention is that my 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 ??????
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post #32 of 41
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 memory volt mod and see where it takes me?
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post #33 of 41
I wouldn't do a memory volt mod unless you get some ramsinks. When you do, then a volt mod would probably be a good idea.
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post #34 of 41
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?
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post #35 of 41
So far as I know, there is not an on-board RAM temperature sensor and there is no good way to measure it without buying a termocouple or something... which is more effort than its worth.

My guess is that it is your CPU. I saw a 3dMark06 score from someone who had the same 7900GS and similar speed, but had a better processor. I score around 1900-2000 for the CPU part, they had something like 3300. I also noticed that their SM2 and SM3 scores were close to 200 points higher than mine, with slightly worse core and memory clocks on the 7900gs. So a better processor can definitely help your SM2 and SM3 scores significantly.

If you want to run you run 3dMark06 and post the detailed scores (Total, SM2, SM3, CPU) at 675-685 core and something like 950 mem (or your highest stable below 960MHz). Then I can run a benchmark at the exact same speeds and let you know my scores... that may give you an idea about how much the CPU is costing you.

here are a few just for reference: x2 3800+ @ 2.7GHz
(all with nVidia 93.71 drivers; core speeds listed are shader domain)

675/1900MHz @ 1.5V w/delta +50

3DMark Score6003 3DMarks
SM 2.0 Score2497 Marks
SM 3.0 Score2454 Marks
CPU Score2052 Marks

700/1950MHz @ 1.55V w/delta +65
3DMark Score6162 3DMarks
SM 2.0 Score2608 Marks
SM 3.0 Score2546 Marks
CPU Score1977 Marks

709/1950MHz @ 1.55V w/delta +65
3DMark Score6206 3DMarks
SM 2.0 Score2633 Marks
SM 3.0 Score2569 Marks
CPU Score1973 Marks

Where: delta = geometric_domain_speed - shader_domain_speed


I am not sure about the memory, but anything's possible. It does look like something is limiting since you only got 40 pionts for a 25MHz increase in the core.
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post #36 of 41
Thread Starter 
I think you might be right. My cpu is limiting me at this point, I scored a little over 5300 on 3DMark 2006, which isn't bad considering I have a P4.

I will probably try to increase my RAM voltage and increase my RAM Mhz speed next to see if that will help.

5500 on 3dMark2006 would be a really nice score for my outdated machine
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post #37 of 41
This will give you an idea about how much benefit memory increases are worth...

675/1900MHz @ 1.5V w/delta +50
3DMark Score 6003 3DMarks
SM 2.0 Score 2497 Marks
SM 3.0 Score 2454 Marks
CPU Score 2052 Marks

650/1900MHz @ 1.5V w/delta +50
3DMark Score5837 3DMarks
SM 2.0 Score2426 Marks
SM 3.0 Score2389 Marks
CPU Score1994 Marks

675/1700MHz @ 1.5V w/delta +50
3DMark Score5839 3DMarks
SM 2.0 Score2466 Marks
SM 3.0 Score2382 Marks
CPU Score1936 Marks

So at least on my system, a 25 MHz core increase is worth about the same as 100MHz increase in the memory.

I really have no idea why there is such descrepancy in the CPU score... anyone know why? I run with basically the same programs running every time (only the background stuff).
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post #38 of 41
Thread Starter 
Thanks for the help, rep point!

I see it helped you increase by about 200 points.... after I did my Video card memory votage/oc increase mine score went up by about went up by about 150 points on 3dMark2006.

I don't think my CPU is to much of a bottle neck at this point, I think the difference in score I have compared with other dual core guys is about 1000 points, and this seems to be in the CPU performance not graffics.

I think 5337 is the most I'll get out of my system on 3dMark2006. Unless there is some other volt mod for the 7900GS that can push behond 1.55v ??
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post #39 of 41
Awesome job. Does your P4 cooler have the copper core or the aluminum core?
    
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post #40 of 41
Thread Starter 
Quote:
Originally Posted by RADEON View Post
Awesome job. Does your P4 cooler have the copper core or the aluminum core?
Thanks!

It looks like the aluminum core... its gray in color same as the fan blades.

Its doing a SUPER good job at cooling my GPU, better then I expected. I'm at 1.55v and this thing barely goes over 60c, even after running for a full hour on ATItool. During games its usualy arround 55c.
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