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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aryonoco - Friday, July 15, 2016 - link
Oh great, another AMD Bulldozer CPU, on 28nm, in 2016.I can't even begin to pretend to be enthusiastic about this.
The only people who will buy this are internet cafe/game centres in developing countries; none of whom care about AT says. I wonder why Ian thought he should spend so much time thoroughly reviewing a part that not one of AT's readers will ever buy.
Cryio - Friday, July 15, 2016 - link
To be fair this is an architecture from 2015 brought to desktops half-hearted and it wasn't released for any good reason IMO.Given the improvements Kaveri and Carizzo pose over the previous generations most of the time, if AMD would have released FX CPUs based on Stream Roller and Excavator, we would've got some interesting CPUs.
kondor999 - Friday, July 15, 2016 - link
Oh look, another shitty, hot, antiquated AMD CPU that only (gosh, I can't actually think of anyone) would buy.I really wish they'd get their act together. Not necessarily because I'd buy their products, but just to force Intel into giving us more than a 3% (or so) IPC iterative improvement.
TheinsanegamerN - Friday, July 15, 2016 - link
So, if you only want AMD to be competitive so that intel is more competitive, how do you expect them to do that when nobody buys their stuff? R and D needs money.silverblue - Friday, July 15, 2016 - link
Though temperature readings appear to be a bit hard to come by, the 845 appears to idle at 26 degrees and full load on AIDA64 at 40 degrees which puts it below anything else AMD has, making it comparable to the Pentium G3220 (though the former does have a better cooling solution).Source: http://www.eteknix.com/amd-athlon-x4-845-carrizo-p...
It's up to you whether you want to believe that or not.
Meteor2 - Saturday, July 16, 2016 - link
I don't think there's more than 3℅ IPC increase annually available. Apple, ARM, Qualcomm and Intel all seem to be converging at any given power.zodiacfml - Friday, July 15, 2016 - link
Waste of time. Yes, it competes with the Pentium, but the Intel chip has integrated graphics which could be useful whether the user has a graphics card or not. Paying more for less.Talking about Zen, it will just compete with Haswell generation chips. Intel knew this which is why their tick-tock strategy has slowed down.
cocochanel - Friday, July 15, 2016 - link
Intel didn't slow down because of AMD. It's because of x86. It's harder and harder even for mighty Intel engineers to squeeze more performance from an antiquated ISA. The fact that Zen took so long to get here it's a clear indication of the same.TheinsanegamerN - Monday, July 18, 2016 - link
There is no clear indicationAMD has far fewer resources then intel does, so it makes sense it would take them much longer to make a new CPU arch then intel.
Intel isnt making any advancements because they have no competition. There may be more performance sitting in their arch they are not using, since there really is no reason to.
Lolimaster - Saturday, July 16, 2016 - link
Carrizo totally gimped by l2 cache.The problem is that Bristol Ridge comes with the same pathetic 2MB for their 4 cores APU.