Select any two CPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game Xeon Processor X5647 Core 2 Extreme QX6850 3.0GHz
Red Dead Redemption 2 68% 131%
Call of Duty: Modern Warfare 25% 72%
Cyberpunk 2077 43% 97%
Halo: Reach 30% 4%
Star Wars: Jedi - Fallen Order 86% 156%
Detroit: Become Human 44% 98%
Borderlands 3 68% 131%
Microsoft Flight Simulator 83% 152%
FIFA 20 20% 66%
Resident Evil 3 Remake 57% 116%

In terms of overall gaming performance, the Intel Xeon Processor X5647 is massively better than the Intel Core 2 Extreme QX6850 3.0GHz 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 Xeon Processor X5647 was released over three years more recently than the Core 2 Extreme, and so the Xeon Processor X5647 is likely to have far better levels of support, and will be much more optimized and ultimately superior to the Core 2 Extreme when running the latest games.

Both CPUs exhibit very powerful performance, so it probably isn't worth upgrading from one to the other, as both are capable of running even the most demanding games at the highest settings (assuming they are accompanied by equivalently powerful GPUs).

The Xeon Processor X5647 and the Core 2 Extreme both have 4 cores, which is not likely to be a limiting factor for gaming.

The Xeon Processor X5647 has 4 more threads than the Core 2 Extreme. The Core 2 Extreme has one thread per physical core, whereas the Xeon Processor X5647 uses hyperthreading and has 2 logical threads per physical core.

Multiple threads are useful for improving the performance of multi-threaded applications. Additional cores and their accompanying thread will always be beneficial for multi-threaded applications. Hyperthreading will be beneficial for applications optimized for it, but it may slow others down. For games, the number of threads is largely irrelevant, as long as you have at least 2 cores (preferably 4), and hyperthreading can sometimes even hit performance.

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 X5647 and Core 2 Extreme 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 Core 2 Extreme has a 0.07 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. As such, we need to look elsewhere for more reliable comparisons.

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 Core 2 Extreme has a 7168 KB bigger L2 cache than the Xeon Processor X5647, and although the Core 2 Extreme 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.

Both the Xeon Processor X5647 and the Core 2 Extreme have the same TDP of 130 Watts, but the Xeon Processor X5647 has a lower lithography size, and so will affect your yearly electricity bills less adversely.

CPU Core Details

CPU CodenameWestmere-EPKentsfield
MoBo SocketLGA 1366/Socket BLGA 775/ Socket T
Notebook CPUnono
Release Date13 Feb 201109 Apr 2007
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores4vs4
CPU Threads8vs4
Clock Speed2.93 GHzvs3 GHz
Turbo Frequency-vs-
Max TDP130 Wvs130 W
Lithography32 nmvs65 nm
Bit Width-vs64 Bit
Max Temperature80°Cvs65°C
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size256 KBvs256 KB
L2 Cache Size1024 KBvs8192 KB
L3 Cache Size12 MBvs-
Max Memory Size-vs-
Memory Channels-vs-
ECC Memory Supportnovsno
Comparison

CPU Graphics

Graphics
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 ReviewThe Xeon is a brand of x86 microprocessors designed and manufactured by Intel Corporation, targeted at the non-consumer workstation, server, and embedded system markets. Primary advantages of the Xeon CPUs, when compared to the majority of Intel's desktop-grade consumer CPUs, are their multi-socket capabilities, higher core counts, and support for ECC memory.Core 2 Extreme QX6850 3.0GHz is a performance Processor based on the 65nm Core micro-architecture.

It offers 4 Physical Cores (4 Logical), clocked at 3.0GHz and 8MB of L2 Cache.
Among its many features, Virtualization is activated.

The processor DOES NOT integrate any graphics. and has a rated board TDP of 130W.

It is a powerful processor whose performance is good. It's thus capable of running most applications smoothly without any problem.

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