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AMD A6-4455M

AMD A6-4455M

The AMD A6-4455M is a mobile ultra-low-voltage (ULV) dual-core processor based on the Trinity architecture. Officially introduced in Q2 2012, it is the direct successor to the Llano A-series of APUs (Accelerated Processing Unit). The processing unit is manufactured in 32nm SOI and integrates a 2.1 GHz CPU (up to 2.6 GHz w/ Turbo Core) with a Radeon HD 7500G GPU alongside a dual-channel memory controller, video de- and encoders and a northbridge.

The CPU cores are based on a reworked Bulldozer architecture, called Piledriver. Although marketed as a dual-core processor, the A6-4455M includes only one module with two integer-cores and and floating-point core. As a result, the CPU is not a true dual-core processor.

When compared to previous Bulldozer cores, AMD has managed to improve upon the IPC (instructions per clock) performance of Trinity cores while allowing for higher clock frequencies. However, when compared to its Llano predecessor, the multithreaded performance of Trinity has only been slightly improved. The enhanced Turbo Core 3.0 feature functions well in speeding up single threaded performance, although it is still not on the same level as Intel’s Turbo Boost equivalent. Regardless, AMD has managed to include other features as well, such as the AVX extension (including FMA) and support for AES encryption.

In terms of raw general performance, the A6-4455M performs significantly faster than the E-Series (e.g. E2-1800), but cannot compete with Intels ULV processors. Nonetheless, CPU performance from the AMD processor should be sufficient for all daily workloads like Office and Internet browsing, but will reach its limits in more demanding applications and multitasking.

The integrated DirectX 11-compatible Radeon HD 7500G offers only 256 shader cores of the Trinity chip (7660G: 384) and, thanks to Turbo Core, will operate anywhere between 360 to 497 MHz depending on the current application demand. On average, the performance of the HD 7500G GPU should be somewhere between the Llano-based Radeon HD 6620G and the HD Graphics 4000 as found in Intel’s Ivy Bridge.

The power consumption of the A6-4455M APU is rated at 17 Watt TDP and is therefore comparable to Intels ULV-processors. Consequently, the A6-4455M is best suited for thin-and-light notebooks.

SeriesAMD A-Series

Series: A-Series Trinity

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AMD A6-4455M « 2.1 - 2.6 GHzcores
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Clock Rate2100 - 2600 MHz
Level 2 Cache2 MB
Number of Cores / Threads2
Power Consumption (TDP = Thermal Design Power)17 Watt
Transistor Count1303 Million
Manufacturing Technology32 nm
Die Size246 mm2
FeaturesSSE (1, 2, 3, 3S, 4.1, 4.2, 4A), x86-64, AES, AVX, FMA
GPUAMD Radeon HD 7500G (327 - 424 MHz)
64 Bit64 Bit support
Announcement Date05/15/2012


Cinebench R11.5 - Cinebench R11.5 CPU Multi 64 Bit
min: 0.85     avg: 0.9     median: 0.9 (1%)     max: 0.87 Points
Cinebench R11.5 - Cinebench R11.5 CPU Single 64 Bit
min: 0.53     avg: 0.6     median: 0.6 (15%)     max: 0.63 Points
Cinebench R10 - Cinebench R10 Rend. Multi (64bit)
min: 3578     avg: 3596     median: 3593.5 (2%)     max: 3620 Points
wPrime 2.10 - wPrime 2.0 1024m *
min: 1950     avg: 2010     median: 1975 (23%)     max: 2104 s
TrueCrypt - TrueCrypt AES
0.5 GB/s (1%)
3DMark 06 - CPU - 3DMark 06 - CPU
min: 1348     avg: 1359     median: 1358.5 (3%)     max: 1372 Points
Super Pi mod 1.5 XS 1M - Super Pi mod 1.5 XS 1M *
min: 37.11     avg: 39.8     median: 37.3 (8%)     max: 45 s
Super Pi mod 1.5 XS 2M - Super Pi mod 1.5 XS 2M *
min: 84.5     avg: 90.7     median: 85.7 (4%)     max: 102 s
Super Pi Mod 1.5 XS 32M - Super Pi mod 1.5 XS 32M *
min: 2194     avg: 2349     median: 2196 (10%)     max: 2658 s
SiSoft Sandra Dhrystone (MIPS) - SiSoft Sandra Dhrystone (MIPS)
min: 15.46     avg: 9615     median: 13880 (7%)     max: 14950 MIPS
SiSoft Sandra Whetstone (MFLOPS) - SiSoft Sandra Whetstone (MFLOPS)
min: 9.24     avg: 6386     median: 9400 (7%)     max: 9748 MFLOPS
3DMark Vantage - 3DM Vant. Perf. CPU no Physx
min: 2596     avg: 2683     median: 2690.5 (2%)     max: 2756 Points
3DMark 11 - 3DM11 Performance Physics
min: 1127     avg: 1184     median: 1212 (3%)     max: 1214 Points
Geekbench 2 - 32 Bit - Geekbench Total Score
min: 2697     avg: 2728     median: 2728 (7%)     max: 2759 Points
- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance

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