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Minimum/Recommended System Specs for rFactor 2
MINIMUM:

CPU: 2.4 GHz Intel Core 2 or 2.4 GHz AMD Athlon x2
Memory: 2 GB
Video Card: nVidia 8600 GT or ATI/AMD 3850
Video Memory: 256MB
Operating System: Microsoft Windows XP, Windows Vista, Windows 7
DirectX: 9.0c
Storage: 4 GB

RECOMMENDED:

CPU: 3.0 GHz Intel Core 2 Duo or 3.0 GHz AMD Athlon II x2 or better
Memory: 4 GB+
Video Card: nVidia 250 GTS or ATI/AMD 4870 or better
Video Memory: 512MB+
Operating System: Microsoft Windows Vista 64bit, Windows 7 64bit
Storage: 4 GB+

Notes:
1 - 2008 Cplusplus Runtimes SP1 required (included with installer).
2 - rFactor 2 executable is 32bit. 64bit OS recommended above to allow more than 4GB RAM.

As posted here

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rFactor 2 – Dedicated Server Requirements Revealed


Following the general system requirements that were revealed back in September, Image Space Incorporated has now revealed the requirements for dedicated servers that want to run the upcoming rFactor 2 simulation.

Keep in mind that these values are general guide-lines, the requirements depend on the kind of tracks and cars as well as the number of users racing on the server.

Bandwidth:
96 Kbits/sec per user for server populations less than 10
256 Kbits/sec per user for server populations between 10 and 20
768 Kbits/sec per user for server populations between 20 and 30

While this is track and vehicle dependent a user can expect something close to these approximations on:

RAM use:
Approximately 200 MB per server instance for server populations less than 10
Approximately 300 MB per server instance for server populations between 10 and 20
Approximately 400 MB per server instance for server populations between 20 and 30

CPU Usage:
This is also dependent on the server population and number of AI drivers but we would account for at least 250 MHz per server instance and on modern CPU, for example if you have a 2.5 GHz dual core you can run 20 servers (10 per core, 10 * 250 Mhz = 2.5 GHz) on that CPU if you have other requirements mentioned above meet. Floating point unit required.

rFactor 2 will introduce various improvements to the modding-friendly simulation including weather, driver animations and a refined graphics engine alongside plenty of current and historic motor racing content. In a recent blog, ISI’s Tim Wheatley hinted at an upcoming public beta phase for the title.


As Published here