Intel Core i5 3470
POV-Ray 3.6 is still a single-threaded benchmark, so here we can have a look at the system vitals while only one core for each processor is kept busy with ray-tracing.
With the single-threaded workload, the Core i5 3470 with the retail heatsink was running at 51°C while the i7-3770K was at 53°C. The i5-2500K was at 52°C and the i5-2400S at a lower 45°C.
The system's total power consumption for the i5-3470 with the single-threaded workload was at 57 Watts, 65 Watts for the i7-3770K, 66 Watts for the i5-2500K, and 63 Watts for the i5-2400S.