Mostly it simply boils down to the thermal output of both the CPUs and the GPUs used by both. They both use 3.2ghz processors although it's important to note that it's typically the GPU that's responsible for hardware failure.
Just compare PCs from say ten years ago and take a look at the heat sinks used by the fastest CPUs at the time. Nothing more than sliced aluminum blocks with no integrated fans. Discrete video card GPUs used tiny fans that today would be used simply to cool the Northbridge memory controller.
Compare those with many of the aftermarket cooling solutions being used today by CPUs clocked at 3.2ghz and above, which range from stacks of copper or aluminum fins 120mm wide or larger, with 120mm integrated fans and multiple copper heat pipes to liquid cooled systems with external radiator tanks.
While the lead free solder virtually guarantees lower life spans for high heat connections, much of the failure has to do more with cooling systems that simply aren't overengineered to last ten plus years.
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