Comparing The Power/Performance Of A NetBurst Celeron & Pentium 4 To Broadwell's Core i7 5775C
The Core i7 5775C was more than 25 times faster than the Pentium 4 "C" 2.8GHz. As a reminder, that old CPU had a 800MHz FSB, 512KB of L2 cache, its single physical core ran at 2.8GHz, and it had a 69.7 Watt TDP for this CPU that was made on a 130nm process. The Celeron D 320 had a 256KB cache, 533MHz bus, 2.4GHz for its single core, and this 90nm CPU sports a 73 Watt TDP. In comparison, the Core i7 5775C has a 6MB cache, four cores plus Hyper Threading, 3.3GHz base frequency, 3.7GHz turbo frequency, and this 14nm CPU has a 65 Watt TDP.
The average power draw of the Celeron 2.4GHz on the IC7-MAX3 system was 126 Watts while the Pentium 4 C was at 117 Watts. Meanwhile, the Core i7 5775C with its 25x+ better performance had an average power draw of 55 Watts with a peak of 94 Watts. For both systems this is the overall AC power draw as measured by the WattsUp Pro and plotted automatically by the Phoronix Test Suite.
The performance-per-Watt for this video encoding test is more than 50x better for the Core i7 5775C Broadwell compared to the Pentium 4 2.8GHz!
Thanks to the Phoronix Test Suite, all the tests are built/compiled and executed in the same exact manner when running comparisons on the same result file.
The C-Ray ray-tracer was also many times superior to the old NetBurst CPUs when running on the Core i7 5775C.