Mullins Benchmarks: Application Performance, Encoding
So Iâve already discussed the improvements AMD has made to their tablet SoC offerings on the previous pages; now itâs time to check out how it performs, and see if we can verify some of AMDâs claims.
The Discovery reference tablet I was provided with is powered by the A10 Micro-6700T (Mullins) SoC clocked as high as 2.2 GHz. Itâs paired with 2 GB of DDR3L-1333 RAM, which is the maximum speed supported by the SoC, and it features a 1080p display, 64 GB of internal NAND and the latest version of Windows 8.1.
The main competitor to Mullins is Intelâs Bay Trail-T, which Iâve used several times before in various Windows 8.1 tablets. While the top-end Z3770 SoC is available to OEMs, most devices seem to pack the Z3740, which is clocked slightly lower. Bay Trail-Tâs official âSDPâ is 2W, but this is a largely useless piece of information that doesnât truly illustrate the power consumption of the SoC. Mullins has a TDP of 4.5 and an âSDPâ of 2.8W, and based on that Iâd expect Bay Trailâs TDP to be around 4W.
Iâve also thrown in a few results from our recent look at entry-level desktop hardware to compare Mullins against SoCs that use more than twice the power. The Bay Trail-D-based Celeron J1900 has a TDP of 10W, while Kabini â AMDâs last-generation of mainstream APUs, replaced by Beema â has a TDP of 25W. If Mullins can come close to, or match these chips on a performance level, AMD will have achieved pretty fantastic energy efficiency.
Where possible Iâve also thrown in results from Qualcommâs Snapdragon 801, Appleâs A7 and Nvidiaâs Tegra 4 ARM-based chipsets. These are found on the majority of high-end Android and iOS tablets, as well as a few Windows RT devices, which Mullins will be competing with in some respects.
Over the next few graphs Iâll be comparing the following devices, and their specific SoCs which will be the focus of this section:
|AMD Discovery||'Mullins' A10 Micro-6700T||4x 2.2 GHz||4.5W||x86-64|
|Lenovo Miix 2 8||'Bay Trail-T' Atom Z3740||4x 1.86 GHz||~4W||x86-64|
|Kabini Desktop||âKabiniâ Athlon 5350||4x 2.05 GHz||25W||x86-64|
|Bay Trail Desktop||âBay Trailâ Celeron J1900||4x 2.4 GHz||10W||x86-64|
|Microsoft Surface 2||Nvidia Tegra 4||4x 1.9 GHz||N/A||ARM|
|Apple iPad Air||Apple A7||2x 1.4 GHz||N/A||ARM|
|Sony Xperia Z2 Tablet||Qualcomm Snapdragon 801||4x 2.3 GHz||N/A||ARM|
Now let's show you some benchmarks.
First up letâs take a look at the two browser-based benchmarks: Peacekeeper and Kraken. In the former, Mullins manages to outperform Bay Trail by 48%, while in Kraken AMDâs Mullins reference tablet edged out the Z3740-powered device by 18%.
In Cinebench, which is a CPU-heavy benchmark, things start to get interesting. Here we see Mullins beat Bay Trail-T to the tune of 19% in multi-threaded mode, and surprisingly beating Bay Trail-D by a larger margin. Compared to the top-end socketed Kabini part, the Athlon 5350, Mullins was 24% slower in multi-threaded mode.
However, thereâs a different story to be told when looking at single-threaded performance. With Kabini and Bay Trail-T, we see roughly one quarter the multi-thread performance in single-thread mode, corresponding well to the SoCâs CPU core count. Mullins, though, achieves one third the multi-thread performance when just one core is being used, as that core can ramp up to 2.2 GHz instead of just 1.5 GHz (47% higher) when four cores are being utilized.
A similar situation can be observed in WinRARâs compression benchmark. Mullins is 7% faster than Bay Trail-T in multi-threaded mode, but 18% faster in single-threaded mode. In both situations the 4.5W APU is outperformed by more powerful desktop SoCs, although itâs worth noting weâre not seeing Bay Trail-D double the performance of Mullins despite its TDP being more than twice as high.
Encoding 1080p H.264 videos on your tablet isnât something youâd likely be doing, but it provides an interesting benchmark. Mullins is 36% faster than Bay Trail-T here, and just 6% behind Kabini despite having an 82% lower TDP. Again weâre seeing wins for AMD on an energy efficiency level.