Alaric, when I searched CPU World on their socket-compatibility page (Socket S1 ((S1g4))) I found the following: "S1g4 is the forth and last revision of socket S1. The S1g4 was employed exclusively by mobile AMD microprocessors from 2010 mainstream platform, code named Danube. All processors from the Danube platform were based on 'Champlain' core, which was a variation of desktop Regor and Propus cores with added low-power features. The S1g4 revision works with single-, dual-, triple- and quad core processors, operating at frequencies up to 3.2 Ghz, having Thermal Design Power up to 45 Watt and packaged in 638-pin lidless micro-PGA package. The socket supports dual-channel DDR3 with data rates up to 1333 Mhz, and one HyperTransport 3.0 link with 1.8 Ghz or lower frequency. All CPU's in the table below will physically fit into the socket, but not all of them may be supported by all motherboards. If you're upgrading a processor in [an] existing system, MAKE SURE THAT THE CPU IS COMPATIBLE WITH YOUR MOTHERBOARD. Please see 'Upgrading socket S1 (S1g4) motherboards' section below for more information". The following is from the "Upgrading Motherboards" section: "The good thing about Danube platform is that all 'Champlain' processors were launched in [a] relatively short period of time...and all of them have the same core-stepping which means most motherboards will support [the] full line of S1g4 microprocessors. Although all 'Champlain' CPU's are very likely to be supported by [the] majority of motherboards, you still need to consider other factors such as Thermal Design Power, that may limit your upgrade choices. Also, your upgrade options could be different depending on the type of applications that your running on your laptop.
. If you're planning to run multi-threaded applications or many CPU-intensive processes at once then consider
upgrading to any processor from the Phenom ll Quad-Core family. Be aware that these CPU's are slower in
single- and dual-threaded applications than Turion ll and dual- and triple-core Phenom ll's, therefore, go
with [a] Quad-Core CPU only if you really need to.
. If you need maximum performance in existing games, or single- and dual-threaded applications, then the
best upgrade option is any one of [the] Phenom ll Dual-Core microprocessors.
Other Upgrade Considerations:
. Be careful when upgrading to CPU's with higher TDP. If you have [a] weak fan/heatsink then you may end
up with a system that automatically shuts down during heavy workloads. Usually, upgrading from 25W to
[a] 35W CPU, or 35W to [a] 45W CPU should not present a problem. If you want to be on the safe side,
then chose [an] upgrade processor with the same, or lower TDP."
Keep in mind that the stats and numbers cited above all pertain to mobile (laptop) applications. So, Alaric, it would seem that I'm on reasonably good ground in my upgrade pursuit and my hope is that I can locate the holy grail of AMD mobile S1 socket processors, i.e., the Phenom ll Quad-Core X940 BE!