AMD Phenom II P840 Triple-Core Mobile Processor
Phenom II P840 is a Triple-Core processor clocked at 1.9 GHz and is intended for entry to moderate performance the notebooks and laptops. If you search for the Phenom ii P840 you may end up with the AMD Phenom II X4 840 Quad-Core 2.6GHz processor which is actually a desktop processor at much higher clock frequency than the notebook processor Phenom ii P840.
The Phenom ii P840 has 512 KB of L2 cache for each of the three cores. The dedicated cores have their own advantages and disadvantages. On the plus side it simplifies the design and somewhat reduces latency. However, it does not benefit single threaded application requiring large amount of L2 cache.
The L1 cache is 64 KB of data and 64 KB of instruction cache for each of the three cores. The Phenom ii P840 has fast DDR3 integrated memory controller. The integrated memory controller, to some extent, makes up for the low L2 cache and the missing L3 cache.
Phenom ii P840 supports the AMD-v virtualization technology and the advanced multimedia instruction sets, including SSE4A.
Built with 45 nm technology, the Phenom ii P840 has a TDP rating of just 25 Watts, which helps in the design of low power and high battery life notebooks.
We do not find any benchmarking result for the Phenom ii P840 processor. It has been launched only recently ( October 2010).
We do not find many notebooks powered by the Phenom II P840 Triple-Core processor. Amazon has a HP Pavilion 16 dv6z priced at $748 and is powered by Phenom ii P840.2