AMD Carrizo Part 2: A Generational Deep Dive into the Athlon X4 845 at $70

Stock Comparison: Real World

For our stock performance comparison, we take our four CPUs at their off-the-shelf frequency and also add in benchmark results from previous reviews for processors that are at a similar price. In the case of the Carrizo core based Athlon X4 845, which had an original MSRP of $70, this means that Intel’s dual core Pentium G3258 at $72 is the main competition. The Pentium comes with integrated graphics and a higher per-clock performance, however the Athlon has four threads to play with, which is two more than the Pentium, meaning the initial examination is a back and forth between the two.

Dolphin Benchmark: link

Many emulators are often bound by single thread CPU performance, and general reports tended to suggest that Haswell provided a significant boost to emulator performance. This benchmark runs a Wii program that raytraces a complex 3D scene inside the Dolphin Wii emulator. Performance on this benchmark is a good proxy of the speed of Dolphin CPU emulation, which is an intensive single core task using most aspects of a CPU. Results are given in minutes, where the Wii itself scores 17.53 minutes.

Dolphin historically favors Intel, and all three of our comparison points beat all the AMD processors here. The Athlon X4 845 holds the top spot for the AMD parts however.

WinRAR 5.0.1: link

Our WinRAR test from 2013 is updated to the latest version of WinRAR at the start of 2014. We compress a set of 2867 files across 320 folders totaling 1.52 GB in size – 95% of these files are small typical website files, and the rest (90% of the size) are small 30 second 720p videos.

As stated earlier in the review, the X4 845's performance is below that of the other Athlon parts due to the 2MB of L2 cache. It still stays within reasonable striking distance of the Pentium here though.

3D Particle Movement v2

The second version of this benchmark is similar to the first, however it has been re-written in VS2012 with one major difference: the code has been written to address the issue of false sharing. If data required by multiple threads, say four, is in the same cache line, the software cannot read the cache line once and split the data to each thread - instead it will read four times in a serial fashion. The new software splits the data to new cache lines so reads can be parallelized and stalls minimized. As v2 is fairly new, we are still gathering data and results are currently limited.

As 3DPMv2 is still new, we don't have G3258 results at this time, but we do have i3-6100TE results. Carrizo has an architectural advantage over other AMD microarchitectures, but the speed of the 760K means that it catches up. Both parts are ahead of the Core i3.

Web Benchmarks

On the lower end processors, general usability is a big factor of experience, especially as we move into the HTML5 era of web browsing. 

Google Octane v2

Both AMD and Intel get similar scores in Octane.