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Gaming Performance Comparison

Recommended System Requirements
Game Phenom II X3 P840 Core i7-660UM 2-Core 1.33GHz
Cyberpunk 2077 423% 244%
Assassins Creed: Valhalla 604% 363%
Call of Duty: Black Ops Cold War 407% 233%
FIFA 21 389% 221%
Microsoft Flight Simulator 493% 289%
Watch Dogs Legion 604% 363%
World of Warcraft: Shadowlands 713% 434%
Grand Theft Auto VI 760% 465%
Horizon: Zero Dawn 493% 289%
Genshin Impact 296% 160%

In terms of overall gaming performance, the Intel Core i7-660UM 2-Core 1.33GHz is significantly better than the AMD Phenom II X3 P840 when it comes to running the latest games. This also means it will be less likely to bottleneck more powerful GPUs, allowing them to achieve more of their gaming performance potential.

The Phenom II X3 was released less than a year after the Core i7-660UM 2-Core, and so they are likely to have similar levels of support, and similarly optimized performance when running the latest games.

The Phenom II X3 has 1 more core than the Core i7-660UM 2-Core. However, while the Phenom II X3 will probably perform better than the Core i7-660UM 2-Core, both CPUs are likely to struggle with the latest games, and will almost certainly bottleneck high-end graphics cards. Both CPUs also have quite low clock frequencies, which means recent games will have to be played at low settings, assuming you own an equivalently powerful GPU.

More important for gaming than the number of cores and threads is the clock rate. Problematically, unless the two CPUs are from the same family, this can only serve as a general guide and nothing like an exact comparison, because the clock cycles per instruction (CPI) will vary so much.

The Phenom II X3 and Core i7-660UM 2-Core are not from the same family of CPUs, so their clock speeds are by no means directly comparable. Bear in mind, then, that while the Phenom II X3 has a 0.57 GHz faster frequency, this is not always an indicator that it will be superior in performance, despite frequency being crucial when trying to avoid GPU bottlenecking. In this case, however, the difference is enough that it possibly indicates the superiority of the Phenom II X3.

Aside from the clock rate, the next-most important CPU features for PC game performance are L2 and L3 cache size. Faster than RAM, the more cache available, the more data that can be stored for lightning-fast retrieval. L1 Cache is not usually an issue anymore for gaming, with most high-end CPUs eking out about the same L1 performance, and L2 is more important than L3 - but L3 is still important if you want to reach the highest levels of performance. Bear in mind that although it is better to have a larger cache, the larger it is, the higher the latency, so a balance has to be struck.

The Phenom II X3 has a 1024 KB bigger L2 cache than the Core i7-660UM 2-Core, and although the Phenom II X3 does not appear to have an L3 cache, its larger L2 cache means that it wins out in this area.

The maximum Thermal Design Power is the power in Watts that the CPU will consume in the worst case scenario. The lithography is the semiconductor manufacturing technology being used to create the CPU - the smaller this is, the more transistors that can be fit into the CPU, and the closer the connections. For both the lithography and the TDP, it is the lower the better, because a lower number means a lower amount of power is necessary to run the CPU, and consequently a lower amount of heat is produced.

The Core i7-660UM 2-Core has a 7 Watt lower Maximum TDP than the Phenom II X3, and was created with a 13 nm smaller manufacturing technology. What this means is the Core i7-660UM 2-Core will consume slightly less power and consequently produce less heat, enabling more prolonged computational tasks with fewer adverse effects. This will lower your yearly electricity bill slightly, as well as prevent you from having to invest in extra cooling mechanisms (unless you overclock).

CPU Core Details

CPU CodenameChamplainArrandale
MoBo SocketSocket S1g4BGA 1288
Notebook CPUyesyes
Release Date01 Sep 201024 May 2010
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores3vs2
CPU Threads-vs4
Clock Speed1.9 GHzvs1.33 GHz
Turbo Frequency-vs2.4 GHz
Max TDP25 Wvs18 W
Lithography45 nmvs32 nm
Bit Width-vs64 Bit
Max Temperature-vs105°C
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size384 KBvs128 KB
L2 Cache Size1536 KBvs512 KB
L3 Cache Size-vs4 MB
Max Memory Size-vs8 GB
Memory Channels-vs2
ECC Memory Supportnovsno
Comparison

CPU Graphics

Graphicsno
Base GPU Frequency-vs-
Max GPU Frequency-vs-
DirectX-vs-
Displays Supported-vs-
Comparison

CPU Package and Version Specifications

Package Size-vs-
Revision-vs-
PCIe Revision-vs-
PCIe Configurations-vs-

Gaming Performance Value

Performance Value

CPU Mini Review

Mini ReviewPhenom II X3 P840 is a triple core mobile CPU based on the Champlain Core and therefore related to the Athlon II X3 Desktop Series.
It features 3 cores, clocked 1.9GHz and the fastest supported memory is DDR3-1066.
Its performance is average and decent enough to run most games at high settings fluently, if paired with the appropriate GPU, obviously. However, the most demanding games will require reduced settings to be played optimally.
Core i7-660UM 2-Core 1.33GHz is an ultra energy efficient mobile CPU based on the 32nm, Nehalem architecture.

It offers 2 Physical Cores (4 Logical), initially clocked at 1.33GHz, which may go up to 2.4GHz and 4MB of L3 Cache.
Among its many features, HyperThreading, Turbo Boost and Virtualization are activated.

The processor integrates very weak Graphics called Intel HD i7 660UM, with 10 Execution Units, initially clocked at 166MHz and that go up to 500MHz, in Turbo Mode which share the L2 Cache and system RAM with the processor.
Both the processor and integrated graphics have a rated board TDP of 18W.

It offers average performance. This means it will become a bottleneck in some demanding applications.