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Modifying a Stock Intel P4 Heatsink for a 7900GS?? - Page 2

post #11 of 41
I thought about trying to put my Zalman CNPS7000 on the 7900GS (it actually had mounting holes that were a very close fit). The problem was the thing weighs about .7kg and I would have had to get some bolts and stuff to mount it correctly.

Maybe down the road after I upgrade again I will try it out. I thought it would be pretty cool, but just wasn't worth the risk.

One thing I though might help would be to put some slices of sturdy foam around the core box. It would help to even out the load and prevent rolling motions across the core... but could still be compressed to get good core contact.

If you think of the effort it would take to do it right, it is really not worth it monetarily... you would only do it for thrill.

Of course, I just got back an XFX rma for a 6600gt (that dies on its own)... so maybe I can have a bit of fun with it when I get some time.
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post #12 of 41
Mods of this type have been done many times... the old socket "A" were very popular for this mod
Enjoy, be patient and measure twice drill once, or twice or however many holes you need
    
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post #13 of 41
It would be too heavy for the graphic card anyways.
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post #14 of 41
Quote:
Originally Posted by Chapstick View Post
It would be too heavy for the graphic card anyways.
Nothing a zip-tie or velcro loop can't fix
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post #15 of 41
Oh yeah, and don't forget that you may want to get a stiff metal backplate to spread the love... i mean weight... across the card. And like you said, a stand-off of some sort to hold up the un-supported corner of the card.
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post #16 of 41
Thread Starter 
Thanks for the reply guys.... I see there is a lot of negative and positive feed back on this, it must be a good post

We'll I'm 1/3 of the way there, I straightened the 4 mouthing brackets as well as cut the ends sticking out.

I did some measurements and I'll have to cut a small chunk of the radiator fins, not much though, and only on the side were the heat sink faces the mother board. I could actually just bend the fins back and make it fit, but it will restrict the air flow. I'll cut about a 1cm chunk off. I'll use a rotary cutter from my steps dad garage tomorrow or Saturday morning. It should only take 5 or 10 minutes. I'll will also need to drill 4 new holes in the brackets. (I measured 3 times) so I know I have this right.

Then I'll just install 4 screws with 4 nuts in the original mouthing holes on the video card.

I don't have a digital camera, but here a small paint picture to explain what part I have to cut in order to make it fit. This is the top view of the heat sink.

Please don't laugh at my artistic skills... this took a hole 2 hours to do
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post #17 of 41
Thread Starter 
Here is the pic...
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post #18 of 41
Thread Starter 
I'm done!... sorry for the long post, but here's the full story.

I finished installing my Intel P4 heat sink on my Nvidia 7900GS KO video card. I increased my stock GPU voltage 1.2v up to 1.5v. The maximum temp I've seen so far is about 75c, not bad for a free heat sink.

It honestly doesn’t look the best... I have to admit, I bent a few of the fins here and there and still have to bend some back into place to take full advantage of the heat dissipation.

I did exactly as describe in my previous post to set it up, I had to cut about 1cm of the metal fins in the back so it would clear the motherboard, and drilled 4 hole on the 4 heat sink brackets, I then installed it on the video card using 4 small screws with 4 bolts. I had to bend some of the fins back in order to make room for the 4 screws, but all in all it went pretty well.

The heat sink was scratched after I was done machining it, so had to lap it down. I lapped it all the way down with 1500 grain sand paper and rubbed it with 2 different grains of rubbing compounds (fine and super fine) until it had a mirror finish.

The only problem I had and "still have" is that my PCI Ethernet card is right bellow the heat sink and the stock Intel fan didn't fit on top of the Heat sink itself, it doesn't clear the PCI ethernet card by 2 or 3 millimeters .... so I installed a 12cm fan in an angle. I can't remove the PCI Ethernet card because my onboard Ethernet is no longer working. (The reason the onboard Ethernet doesn't work it because my BUS speed is over clocked from 200 MHz to 260 MHz and the on board Ethernet controller isn't capable of functioning at those speeds)

As far as the heat sink weight... it’s not a problem at all. The heat sink is a tad heavier then the stock Nvidia heat sink but not by much since its made of aluminum (The stock Nvidia heat sink is copper).

Here are a few pics.... please comment, good or bad

Enjoy!



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post #19 of 41
nice job man , lol what are the temps?
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post #20 of 41
Thread Starter 
Keeping in mind this card as been volt modded to 1.5v... the max temp I've seen so far was 75c.
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