From the outside the heatsink looks the same as the 280GTX, but if looked at more closely, there are some differences. The first ones are apparent even without taking the heatsink off, as the heatsink structure has changed some what under the fan. If the heatsink is removed, there are some more differences. The heatsink design is actually pretty smart, as the power-circuits of the card are cooled by the air that flows by them that the fan sucks from underneath.
Now if you want to take off the heatsink to see what really is hidden behind it, this is what you'll find.
The GPU-core area is completely surrounded in the 285GTX with the memory chips. Just like I mentioned earlier, the 285GTX doesn't have any memory chips on the other side of the PCB, ultimately making the PCB cheaper to manufacture. The power circuitry has also been severely reworked in the newer 285GTX.
Here we can get a closer look at the GPU-core. G200-350-B3 tells us that this is the newer GT200b-core, as the old GT200 cores had G200-300-A2 written on the top.
Now that we've gotten the heatsink off the card, we might take closer look at it as well. The heatsink is mostly made out of cast aluminum. The core-area of the heatsink is just an inserted copperpiece that helps transfer the heat away from the core. Here in this picture the heatsink still has its plastic shell attached.
Now that we have gotten rid of the plastic shroud off the heatsink, we can get a closer look at the fins on the heatsink. As you can probably spot, the ribbed top of the card is actually part of the aluminum-base of the heatsink so it should help get rid of some of the heat. There are actually three heatpipes which are routed under the fins twice, meaning that there are an effective number of 4 heatpipes running under the copper-core area and two additional ones that cool the rest of the card.
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