Crucial Ballistix BL2KIT25664FN2139 4GB PC3-17000
This new Ballistix with tall black heat spreaders is shipped in a clear packaging with a colored insert to match the yellow/orange stripe on the modules. The cut away window also gives you a peek at the 9-10-9-24 timings and 1.65V requirement of this 2133 MHz Memory.
On the back Crucial provides a mission statement of their high speed modules in three languages and offers the support address if you do run across any issues.
These new modules are based on a black PCB that not only houses the memory ICs, but also holds a I2C chip that can monitor and send temperatures from the modules that can be read via software. Surrounding the PCB and memory chips is an all new design of heat spreader that uses a tall, almost "toothed" effect to aide in removing heat.
Just for verification, I wanted to show off the model number and the specs of this kit. The main reason I haven't had Crucial DDR3 yet is that they wouldn't go over 1600 MHz. for a long time. That time is over; as you can see they have broken right past that barrier.
Flipping the modules over, most obviously they lack any striping. As they are installed into my P55A-UD7 they are oriented that I see the stripe and the plain sides face the CPU cooler.