What cooler does it have?

Intel branded stock cooler. All aluminum. Very short.

what does the plus mean?

+ means it comes with the 16gb optane m.2 module.

Questions & Answers: Intel Core i5 8th Gen - Core i5-8500 - Coffee Lake 6-Core 3.0 GHz (4.1 GHz Turbo) LGA 1151 (300 Series) 65W BO80684I58500 Desktop Processor Intel UHD Graphics 630 with 16GB Intel Optane Memory Module

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Intel Core i5 8th Gen - Core i5-8500 - Coffee Lake 6-Core 3.0 GHz (4.1 GHz Turbo) LGA 1151 (300 Series) 65W BO80684I58500 Desktop Processor Intel UHD Graphics 630 with 16GB Intel Optane Memory Module

With 16GB Intel Optane Memory Module
Core I Plus
Only Compatible with Intel 300 Series Motherboard
For A Great VR Experience
Max Turbo Frequency 4.1 GHz
Intel UHD Graphics 630
DDR4 Support
Socket LGA 1151 (300 Series)
Fan and Cooler Included

Out of Stock