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Z71V - Sand down the GPU sink

post #1 of 14
10/30/05 at 6:36pm
Thread Starter 
Well, not the SINK part itself, but the 4 holes for the screws.
Ive sanded them down low enough so when I put my heatsink back on with a thin layer of artic silver, the GPU and the memory chips have contact to the heat sink

I can run my 6600go at 300mhz in HL2 for hours now.

enjoy.. if this hasnt been already advised before.
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post #2 of 14
10/30/05 at 6:43pm
Just wondering what kind of Sand paper you used. I only have 120 lying around, and I'm frightened that it might leave too big of marks on it.

Thanks,

mrfocus
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post #3 of 14
10/30/05 at 6:45pm
Thread Starter 
Quote:
Originally Posted by mrfocus
Just wondering what kind of Sand paper you used. I only have 120 lying around, and I'm frightened that it might leave too big of marks on it.

Thanks,

mrfocus
I used a metal file actually
Thing is, you will be sanding the little "legs" where the screws go in. It doesnt matter if its perfectly smooth or not, its not a heat transfer point, its only legs for the sink. Problem is, the legs are too long so the sink doesnt touch the GPU or memory.
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post #4 of 14
10/30/05 at 6:48pm
Quote:
Originally Posted by alkizmo
I used a metal file actually
Thing is, you will be sanding the little "legs" where the screws go in. It doesnt matter if its perfectly smooth or not, its not a heat transfer point, its only legs for the sink. Problem is, the legs are too long so the sink doesnt touch the GPU or memory.
And are these the legs on the GPU side? (Just want to be 100% sure.) Are they the ones on the far edge, the middle or the inside edge of the GPU heatsink? (Just want to be sure before I go playing around in there)
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post #5 of 14
10/30/05 at 7:27pm
Thread Starter 
you sand down on the GPU side, yes, that would be logical no?

you may have trouble with on of the legs for the exhaust side, because it doesn't stand out like the other 3, I used a file and cut in horizontally and then I could sand horizontally down.

the point of it is to make those legs shorter so there is less space between the sink and the GPU.

You'll see when you unscrew it.
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post #6 of 14
10/30/05 at 7:45pm
Quote:
Originally Posted by alkizmo
you sand down on the GPU side, yes, that would be logical no?

you may have trouble with on of the legs for the exhaust side, because it doesn't stand out like the other 3, I used a file and cut in horizontally and then I could sand horizontally down.

the point of it is to make those legs shorter so there is less space between the sink and the GPU.

You'll see when you unscrew it.
Hum, great trick!

I just did the middle ones (the ones that you have easy access to). Took out the Dremel with a sanding bit and just took off a little of the metal. I didn't even have a go at the far edge ones, seeing as they're less accesible. Before a I shut down my computer (at idle), the GPU was at 72-73 (reading from SpeedFan). At the moment, it's idling at about 61-62. Although I didn't have results from a Load GPU, I'm going to see how high it gets at the moment.
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post #7 of 14
10/30/05 at 9:03pm
After a while of testing :P 78 is the highest I got! (Never checked before, but it must've been at least mid-80's)
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post #8 of 14
10/30/05 at 11:04pm
Thread Starter 
id suggest making sure the GPU touches the heatsink well enough. Put it on, without screwing it and pull it back out and see if the thermal paste marked the spot.

I dont know my temsp, but at least I can OC a lot higher and my GPU fan reacts a lot less when scrolling
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post #9 of 14
10/31/05 at 12:20am
3dmark05!
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post #10 of 14
10/31/05 at 9:51am
I did this a long time ago when I took apart the cooling system for the Z71V. Unfortunately, I have a crappily made heatsink or something. I filed down the legs a bit, however the problem is that the heatsink itself isn't level. It already contacts the chipset totally perfectly, so by sanding it down, it made the pressure between the chipset and heatsink too much while the GPU still doesn't contact it properly. It's the poops.
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post #11 of 14
10/31/05 at 3:51pm
is it possible to bend it?
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post #12 of 14
10/31/05 at 3:56pm
I did this also a while back. It really takes quite a bit of experimentation to get the right amount of contact. I had to apply/reapply the thermal paste many times.

I also used a file and I used a dremel tool and a round grinder to get at that leg near the exhaust port. Basically grinding away at the surrounding metal until I could grind down the surface that rests on the motherboard anchors.

I found a useful tool to have is a dial calliper. If it the heatsink wasn't making appropriate contact, I would take the measurement of the leg that needed grinding, grind like .3mm off (measuring my progress as I grinded away) and try to mount it again, rinse and repeat. Also by measuring the leg from different sides, I was able to keep the surface flat and even.

Also if you go through this mod and like me and grind too much off a leg, just grab one of those washers that come in the screw bag when you buy a motherboard and use it as a spacer, it's just the right size.
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post #13 of 14
10/31/05 at 4:02pm
Great practical tip!

Please be very careful when doing mods...
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post #14 of 14
10/31/05 at 4:27pm
Hehe... yes care should be exercised... that reminds me of the time that I performed this mod. I went to look for the little metal cover that goes over the heatsink. I pushed myself backwards to look under the desk I was working at only to find that I just ran over it with the back wheel of my chair. I had to get a hammer and pound it flat again. Now it looks like my heatsink was in a car accident.

Oh yeah, and keep the metal shavings that get grinded away, away from the motherboard. Wipe the heatsink down after every filing/grinding before mounting it again.

Also when I went to screw the heatsink back in, I must of done so too many times, with too much force, so one of the anchors ripped off from the motherboard. I had to dissassemble the entire notebook, yank the motherboard out, flip it over, and solder that anchor back in.

I guess I'm the prime example of what not to do during this mod. Ah well, live and learn. Luckily I had the know-how to repair my mishaps. But it works, and the mod did lower temps slightly, so it worked out in the end.
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