While Intel’s Generation 12, known as Alder Lake, is also slated for this year, its Generation 11 is a game-changer when it comes to Intel. In an effort to extend IPC and with it, performance after generations using the same kernel has changed kernels. With this, they can withstand AMD Zen 3 and outperform AMD architecture under certain conditions.
Core i9-11900K has better CPI than Zen 3 according to Geekbench
The Core i9-11900K it has been tested three times under Geekbench. All with the same motherboard configuration, Gigabyte Z490 AORUS Master, and with DDR4-3600 MHz as RAM.
The best single thread test result gave the score of 1905 points, while the one that checks the performance of multiple threads gave the result of 10994 points. The conclusion drawn from these results is that the performance of the Core i9-11900K is 13% faster than that of the Ryzen 5950X, which is why the Intel processor is faster in single thread than the Ryzen 9 5950X.
This could be due to the abandonment of a core based on a Skylake-derived core for the eleventh generation of desktop Intel Core. Let’s not forget that in the Rocket Lake-S architecture a new core is used, which brings a 19% increase in CPI over the previous generation.
Are you cheating Intel?
One of the peculiarities of the Rocket Lake-S architecture is the fact that a single core can be placed at a speed of 5.3 GHz exclusively. That is, Intel uses a single-core boost, in which only one of the cores is throttled at a higher clock speed than the usual boost.
In this case, the Intel Core i9-11900K processor has been accelerated to a speed of 5.3 GHz, so in the benchmark the processor is running 500 MHz higher than its Boost speed for all cores, which is 4, 8 GHz.
AMD Zen 3 wins in multi-threading on the Intel Core i9-11900K
The downside is in terms of performance with multiple execution threads running in parallel, the reason is that Intel has decided to limit the maximum number of cores of its Rocket Lake-S based Intel Core Gen 11 to just 8 cores, while Processors and AMD have configurations of up to 16 cores, which allows it to reach 14,000 points as shown in the graph.
How does this translate into performance? It’s hard to know and will depend on the software code. So there will be some programs that take more advantage of the larger number of cores and threads of AMD Zen and others of having a slightly higher CPI in the case of Intel.
It’s a shame that the Intel Gen 11s have such high prices, because compared to the Ryzen 7 5800X with the same number of cores it is more expensive, but the Intel product generally brings a number of implicit advantages in terms of support. as its users. know how to appreciate.
What is the IPC of a CPU?
Due to the use of the term IPC in marketing, a misrepresentation of the term eventually arose. If we speak in terms of processor architecture, the IPC is the number of instructions that a processor executes simultaneously, which should not be confused with the IPC which is the number of cycles per instruction.
In its classic definition, IPC does not refer to the number of instructions that a processor has resolved at the same time, but in the definition that has been given by marketing, IPC is the number of instructions that go out in parallel. And how do they measure it? They take a program, for example a benchmark, whose instructions are counted and they run it counting time. Since the frequency, the clock cycles, is the inverse of time, they can therefore know an average of the number of instructions per cycle.
But this measurement is not entirely correct, as not all programs speed up the same in all CPUs and there are other factors such as communication latency that must be taken into account.
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