Crucial Ballistix Tracer 2GB DDR2 SDRAM Memory Module - 113718
Crucial Ballistix Tracer 2GB (2 x 1GB ) PC2-8500 1066MHz 240-pin DDR2 Memory w/ LED Lights BL2KIT12864AL1065

So, What is Ballistix Tracer Memory?
Ballistix Tracer memory is specifically built for performance enthusiasts and case modders who want to push the performance envelope while adding flash appeal to their boxes. The Ballistix line of high-performance memory modules features advanced speed grades, low latencies, and integrated aluminum heat spreaders. Ballistix Tracer memory features a black PCB, black integrated heat spreaders, and one or two rows of eight "chasing" red and green LEDs atop the module, circulating in a random pattern based on memory utilization. A custom-designed circuit relays bus activity to the LEDs, allowing them to accurately reflect usage of each memory module. In addition, eight blue ground effects LEDs emit a constant glow near the pins.

So you ask yourself, "What has Crucial done to make sure Ballistix products operate at the published speed ratings?"

Good question!
After Crucial manufacture's the modules, every Ballistix product is tested in a platform capable of running at its published operating speed.
Crucial Ballistix DDR2 is a leading-edge generation of memory with an improved architecture that allows it to transmit data extremely fast & stable.

What is a Ballistix 240-pin DIMM?
A Ballistix dual inline memory module (DIMM) consists of a number of memory components that are attached to a black printed circuit board. The gold pins on the bottom of the DIMM provide a connection between the module and a motheboard. Ballistix 240-pin DIMMs are used to provide DDR2 SDRAM memory for desktop computers.