AMD Carrizo Part 2: A Generational Deep Dive into the Athlon X4 845 at $70
by Ian Cutress on July 14, 2016 9:00 AM ESTLinux Performance at 3 GHz
Built around several freely available benchmarks for Linux, Linux-Bench is a project spearheaded by Patrick at ServeTheHome to streamline about a dozen of these tests in a single neat package run via a set of three commands using an Ubuntu 11.04 LiveCD. These tests include fluid dynamics used by NASA, ray-tracing, OpenSSL, molecular modeling, and a scalable data structure server for web deployments. We run Linux-Bench and have chosen to report a select few of the tests that rely on CPU and DRAM speed.
All of our benchmark results can also be found in our benchmark engine, Bench.
C-Ray: link
C-Ray is a simple ray-tracing program that focuses almost exclusively on processor performance rather than DRAM access. The test in Linux-Bench renders a heavy complex scene offering a large scalable scenario.
C-ray, while slowly fading in importance as a benchmark, shows a slight gain here for Kaveri despite the lack of DRAM accesses this benchmark uses. There may however still be some L2 use.
NAMD, Scalable Molecular Dynamics: link
Developed by the Theoretical and Computational Biophysics Group at the University of Illinois at Urbana-Champaign, NAMD is a set of parallel molecular dynamics codes for extreme parallelization up to and beyond 200,000 cores. The reference paper detailing NAMD has over 4000 citations, and our testing runs a small simulation where the calculation steps per unit time is the output vector.
NAMD shows a small benefit for Kaveri here, with all three processors showing a +16% gain minimum over Trinity.
NPB, Fluid Dynamics: link
Aside from LINPACK, there are many other ways to benchmark supercomputers in terms of how effective they are for various types of mathematical processes. The NAS Parallel Benchmarks (NPB) are a set of small programs originally designed for NASA to test their supercomputers in terms of fluid dynamics simulations, useful for airflow reactions and design.
Redis: link
Many of the online applications rely on key-value caches and data structure servers to operate. Redis is an open-source, scalable web technology with a strong developer base, but also relies heavily on memory bandwidth as well as CPU performance.
The 2MB of L2 cache, compared to the 4MB of the other parts, hurts Carrizo here.
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Meteor2 - Saturday, July 16, 2016 - link
Thanks. It's a little more complex than i3/5/7-nxxx, where n increments by one each generation...TheinsanegamerN - Monday, July 18, 2016 - link
cariizo cores use the excavator design. excavator is core design, carrizo is the product line.Mokona512 - Saturday, July 16, 2016 - link
Please do this test with the Phenom II series in order to understand the generational IPC changes, and also providing a better point of reference for the Zen CPUs. The Zen claims are based on IPC changes from a CPU series where there was a drop in IPC.Ian Cutress - Monday, July 18, 2016 - link
I recently redid a Phenom X6 in Bench, though that's absolute chip perf and not exactly what you're looking for, but it's there :)Elizabeth king - Sunday, July 17, 2016 - link
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I find AMDs low cost offerings really interesting but this just doesn't work for me. The Carrizo on the desktop just seems too limiting. I wish that AMD would update the AM1 line. It is so inexpensive and can support a good number of PCIe lots. For things like a NAS, media pc, or even a Chrome box/low end pc they seem like a really good choice except that they have not been updated in years.silverblue - Monday, July 18, 2016 - link
Puma+ is kind of like what Atom did with their earlier Atoms, a more efficient version of Jaguar. I'm surprised that they didn't just lock the turbo and produce these in Jaguar's place, unless it's not cost-effective to do so.The cat cores are dead now, which is a shame as we never got to see how a dual channel memory interface would improve their performance.
Eris_Floralia - Monday, July 18, 2016 - link
Another great review. I've translated all articles about Bulldozer architecture into Chinese in order to let people know why it didn't success. I believe that an eight-core Steamroller or Excavator would be competitive, but that never comes out.TheinsanegamerN - Monday, July 18, 2016 - link
it wont be competitive, excavator is still far behind intel is performance and in TDP, and cant overclock at all. And it is still 28nm and cache limited.AMD really needs to kill the bulldozer line. It is AMD's netburst.
Eris_Floralia - Monday, July 18, 2016 - link
well, with some adjustments, steamroller can still reach high frequency. with additional L3 and larger L2, the problem with excavator may get solved. I mean that latest bulldozer architecture can do better than present piledriver, but the improvement obiviously doesnt worth a try.