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Gaming Performance Comparison

Recommended System Requirements
Game Xeon Processor E5603 Pentium Dual Core B950 2.1GHz
Cyberpunk 2077 261% 360%
Assassins Creed: Valhalla 386% 519%
Call of Duty: Black Ops Cold War 250% 345%
FIFA 21 237% 330%
Microsoft Flight Simulator 309% 421%
Watch Dogs Legion 386% 519%
World of Warcraft: Shadowlands 461% 615%
Horizon: Zero Dawn 309% 421%
Grand Theft Auto VI 493% 655%
Genshin Impact 173% 248%

In terms of overall gaming performance, the Intel Xeon Processor E5603 is noticeably better than the Intel Pentium Dual Core B950 2.1GHz 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 Pentium Dual Core was released less than a year after the Xeon Processor E5603, and so they are likely to have similar levels of support, and similarly optimized performance when running the latest games.

The Xeon Processor E5603 has 2 more cores than the Pentium Dual Core. With 4 cores, the Xeon Processor E5603 is much less likely to struggle with the latest games, or bottleneck high-end graphics cards when running them.

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 Xeon Processor E5603 and Pentium Dual 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 Pentium Dual Core has a 0.5 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 Xeon Processor E5603.

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 Xeon Processor E5603 has a 512 KB bigger L2 cache than the Pentium Dual Core, which means that it, at worst, wins out in this area, and at best, will provide superior gaming performance and will work much better with high-end graphics cards.

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 Pentium Dual Core has a 45 Watt lower Maximum TDP than the Xeon Processor E5603 (though they were created with the same size 32 nm manufacturing technology). What this means is the Pentium Dual Core will consume significantly less power and consequently produce less heat, enabling more prolonged computational tasks with fewer adverse effects. This will lower your yearly electricity bill significantly, as well as prevent you from having to invest in extra cooling mechanisms (unless you overclock).

CPU Core Details

CPU CodenameWestmere-EPSandy Bridge
MoBo SocketLGA 1366/Socket BrPGA 988A / B / Socket G1 / G2
Notebook CPUyesyes
Release Date13 Feb 201115 May 2011
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores4vs2
Clock Speed1.6 GHzvs2.1 GHz
Turbo Frequency-vs-
Max TDP80 Wvs35 W
Lithography32 nmvs32 nm
Bit Width-vs-
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size128 KBvs128 KB
L2 Cache Size1024 KBvs512 KB
L3 Cache Size4 MBvs2 MB
ECC Memory Supportnovsno
Comparison

CPU Graphics

Graphicsnono

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 ReviewIntel Xeon E5603 is a Server CPU part of the Xeon Series continuously released by Intel.
It's based on the Nehalem architecture and the memory controller supports DDR3-800 and DDR3-1066.
The performance is much worse than the others in Series and falls behind most middle-class i3, i5. Since Intel Xeon E5603 wasn't built for gaming purposes it comes at a considerably high price.
Pentium Dual Core B950 2.1GHz is an entry-level CPU part of the Pentium Dual Core Series release by Intel.
It's based on the Sandy Bridge architecture but many of the special technologies are deactivated and has 2 cores, whereas each core only has one thread.
The performance is average and enough to play Very Demanding games smoothly, at least with medium detail.