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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mrdude - Thursday, July 14, 2016 - link
Fantastic work, Ian. Now if AMD put half as much work into their uArchs as you did into reviewing them, we might finally get somewhere =PGeranium - Thursday, July 14, 2016 - link
Ian,Exynos 7420 and Apple A9 is built on Samsang's 14nm LPE. Exynos 8890 and Snapdragon 820 is built on 14nm LPP.
Vlad_Da_Great - Thursday, July 14, 2016 - link
AMD CPU R&D has been outsourced pretty much close to an 1 year ago. Even Jim Keller left before anything(silicon) was remotely close to be released. AMD has submitted on the CPU front, and now with the another failure from the RX 480 power fiasco it seems in the GPU segment too. ZEN is just a myth for the small minded amoebas. The closest they can come to is Haswell, even in some benchmarks they will be far behind.Intel has reported times in many improvement over the 4/5y spam CPU's. AMD can barely get 30% and in some synthetic benchmarks they are below something was produced/developed half a decade ago.
TheinsanegamerN - Friday, July 15, 2016 - link
You have sources for your ludicrous claims?wumpus - Friday, July 15, 2016 - link
Zen tapped out. Thus the drawdown. But if you think Zen will compare as well to Intel silicon as the 480 does to the 1060, remember that Intel is still hand-laying out the transistors and AMD is using autorouters.Hopefully AMD will at least be able to get back to producing "the cheap stuff', but that is their best hope. They've pretty much surrendered.
Calculatron - Thursday, July 14, 2016 - link
Great article, overall! I am glad to see someone finally review the product.I was hoping, however, that you would come across this strange "throttling" issue that this CPU seems to have while playing certain games (not all games, just certain ones). Some people have started threads on Tom's Hardware, and I started one on AMD's own forums:
https://community.amd.com/thread/198618
http://www.tomshardware.com/answers/id-3054721/ath...
DominionSeraph - Thursday, July 14, 2016 - link
Yeesh, the barest overclock physically degrades the processor? This likely means it's degrading at stock as they've pushed a 35W part to 65W and beyond.Sherlock - Thursday, July 14, 2016 - link
/rantWho's your web-designer Anandtech - seriously - I see a big banner at the top & two big ads on the left & right of the page. I am so pissed by the design - I actually calculated the pixel count - only 24% of the screen is dedicated to content - excluding the large Anandtech logo & the menu bars - 10% for the screen is content - please don't kill the site with such crap
rant/
Also - "For clarity, hand was from AMD but not Lisa Su's" :)
DominionSeraph - Friday, July 15, 2016 - link
A narrow column is more readable. Who cares what's on the sides?The_Assimilator - Friday, July 15, 2016 - link
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