Do you get tense wondering whether or not your Mac is running hot? Hard disk SMART status on your mind? Track, monitor and obsess over these Mac system stats and a whole lot more with iStat Menus, which now offers improved OS X Mountain Lion and Retina display support.

The good folks at Bjango has released iStat Menus 4 (version history) and this whole number update includes a fair amount of heft for your dollar:

• Full Retina display support, including all new menubar icons and user interface
• Improved support for OS X 10.8 Mountain Lion
• Added per process network bandwidth monitoring
• Added support for calendar events
• Added history graphs for CPU over 1 hour, 24 hours and 7 days
• Added history graphs for memory over 1 hour, 24 hours and 7 days
• Added history graphs for disk space over 24 hours and 7 days
• Added history graphs for disk activity over 5 minutes, 1 hour, 24 hours and 7 days
• Added history graphs for network activity over 1 hour, 24 hours and 7 days
• Added history graphs for load averages over 5 minutes, 1 hour, 24 hours and 7 days
• Added history graphs for sensors over 1 hour, 24 hours and 7 days
• Added more detailed GPU monitoring
• Added the ability to change fan speed from the menubar
• Added SMART status monitoring to disks
• Added read and write IOPS to disks
• Combined Disks and Disk Activity
• Improved icon
• Hundreds of bug fixes and other minor improvements

Bjango offers 14-day free trial of iStat Menus 4, which requires OS X 10.6 or later. Existing 3.x license holders can purchase iStat Menus 4 for $9.

A full license sells for $16.

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