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Gaming Performance Comparison

Recommended System Requirements
Game Celeron M 390 1.7GHz Sempron SI-40
Cyberpunk 2077 2151% 2039%
Assassins Creed: Valhalla 2931% 2780%
Call of Duty: Black Ops Cold War 2082% 1973%
Watch Dogs Legion 2931% 2780%
FIFA 21 2006% 1900%
Microsoft Flight Simulator 2450% 2323%
Godfall 4248% 4031%
Grand Theft Auto VI 3600% 3415%
World of Warcraft: Shadowlands 3400% 3225%
Genshin Impact 1605% 1519%

In terms of overall gaming performance, the AMD Sempron SI-40 is marginally better than the Intel Celeron M 390 1.7GHz 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 Sempron SI-40 was released less than a year after the Celeron M 390, and so they are likely to have similar levels of support, and similarly optimized performance when running the latest games.

Both CPUs exhibit very poor performance, so rather than upgrading from one to the other you should consider looking at more powerful CPUs. Neither of these will be able to run the latest games in any playable way.

The Celeron M 390 and the Sempron SI-40 both have 1 cores, and so are quite likely to struggle with the latest games, or at least bottleneck high-end graphics cards when running them. With a decent accompanying GPU, the Celeron M 390 and the Sempron SI-40 may still be able to run slightly older games fairly effectively.

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 Celeron M 390 and Sempron SI-40 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 Sempron SI-40 has a 0.3 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 .

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 Sempron SI-40 has a 511 KB bigger L2 cache than the Celeron M 390, but neither of the CPUs have L3 caches, so the Sempron SI-40 wins out in this area with its larger L2 cache.

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 Celeron M 390 has a 4 Watt lower Maximum TDP than the Sempron SI-40. However, the Sempron SI-40 was created with a 25 nm smaller manufacturing technology. Overall, by taking both into account, the Sempron SI-40 is likely the CPU with the lower heat production and power requirements, by quite a wide margin.

CPU Core Details

CPU CodenameDothanSable
MoBo SocketSocket 479Socket S1
Notebook CPUyesyes
Release Date25 Mar 200604 Jun 2008
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores1vs1
Clock Speed1.7 GHzvs2 GHz
Turbo Frequency-vs-
System Bus 400 MHzvs-
Max TDP21 Wvs25 W
Lithography90 nmvs65 nm
Bit Width32 Bitvs-
Voltage Range1.004V-1.292V KBvs-
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size-vs128 KB
L2 Cache Size1 KBvs512 KB
L2 Cache Speed-vs-
L3 Cache Size-vs-
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 Size35mm x 35mmvs-
Revision-vs-
PCIe Revision-vs-
PCIe Configurations-vs-

Gaming Performance Value

Performance Value

CPU Mini Review

Mini ReviewThe Celeron is a family of microprocessors from Intel targeted at the low-end consumer market. CPUs in the Celeron brand have used designs from sixth- to eighth-generation CPU microarchitectures. [Please be aware that GD data is constantly refined as more information and reports are made available.]Sempron SI-40 a mobile CPU part of the Cheap CPUS called "Sempron" released by AMD.
With only one core the performance is very very poor, so today's games might cause troubles.