- Nov 28, 2007
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Ok, so today, since I had nothing to do, I told myself that it is a good day to test the S1 I had since my 8800 GT. So, I removed the stock cooler, clean everything up with isopropylic alcohol, installed ram sinks , the VRM heatsink and put two 120 mm fans on it, for maximum efficiency 
.
The results:
http://img142.imageshack.us/my...image=photo0048ps0.jpg]
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The first photo is the naked card. Sorry but I've moved the stupid phone when I shot it. Even so, you can see the mud ATI used for "better heat transfer" between the gpu and heatsink. If some engineer would explain the sense of the thermal paste to that human that mounts the cooler onto the cards, then maybe they would not use 1 L of paste for every card.
http://img395.imageshack.us/my...image=photo0049my4.jpg]
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Every memory chip has been covered here. I used a low profile copper heatsink for the last memory chip, since a normal sink couldn't fit because of one of the heatpipes. The VRM big heatsink has been mounted using some double sided sticky tape and tightened with those two zip ties for better heat transfer.
http://img395.imageshack.us/my...image=photo0050wt2.jpg]
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This is everything mounted. I've used one Titan 120 mm fan at 1400 rpm and a Xigmatek fan of 1500 rpm ( this was recycled from my S1283 ).
And this is how everything fits inside the case, the heat being thrown away inside right into the cpu cooler. Great stuff.
http://img77.imageshack.us/my....image=photo0051fq0.jpg]
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And now the final battle. This is what I got at boot:
http://img171.imageshack.us/my...?image=acceleroix2.jpg]
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34 C idle and low temperatures all over the card. 50 C was the highest for the VRM. Now the problem occurred at full load. After just a couple of seconds of ATI tool artifact test, VRMs hits 95C and this is where the test ends for me. I've touched the VRM heatsink and it was hot, so the contact was good between the little chips and him. Everything else was great, the gpu was some 2-3 C lower, but without the stock fan roaring like hell.
The bottom line is that the 4870 has one tough VRM area to cool down. The only good thing that I got from this, is that by changing the thermal paste with some AS 5, I've managed to decrease my temps and now the stock cooler gives me the same temperatures I had at 70% fan speed, at 45% fan speed, which is much more silent.
.The results:
http://img142.imageshack.us/my...image=photo0048ps0.jpg]
The first photo is the naked card. Sorry but I've moved the stupid phone when I shot it. Even so, you can see the mud ATI used for "better heat transfer" between the gpu and heatsink. If some engineer would explain the sense of the thermal paste to that human that mounts the cooler onto the cards, then maybe they would not use 1 L of paste for every card.
http://img395.imageshack.us/my...image=photo0049my4.jpg]
Every memory chip has been covered here. I used a low profile copper heatsink for the last memory chip, since a normal sink couldn't fit because of one of the heatpipes. The VRM big heatsink has been mounted using some double sided sticky tape and tightened with those two zip ties for better heat transfer.
http://img395.imageshack.us/my...image=photo0050wt2.jpg]
This is everything mounted. I've used one Titan 120 mm fan at 1400 rpm and a Xigmatek fan of 1500 rpm ( this was recycled from my S1283 ).
And this is how everything fits inside the case, the heat being thrown away inside right into the cpu cooler. Great stuff.
http://img77.imageshack.us/my....image=photo0051fq0.jpg]
And now the final battle. This is what I got at boot:
http://img171.imageshack.us/my...?image=acceleroix2.jpg]
34 C idle and low temperatures all over the card. 50 C was the highest for the VRM. Now the problem occurred at full load. After just a couple of seconds of ATI tool artifact test, VRMs hits 95C and this is where the test ends for me. I've touched the VRM heatsink and it was hot, so the contact was good between the little chips and him. Everything else was great, the gpu was some 2-3 C lower, but without the stock fan roaring like hell.
The bottom line is that the 4870 has one tough VRM area to cool down. The only good thing that I got from this, is that by changing the thermal paste with some AS 5, I've managed to decrease my temps and now the stock cooler gives me the same temperatures I had at 70% fan speed, at 45% fan speed, which is much more silent.
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