I do consider myself lucky in that when I responded to a public relations email from one of the Crucial representatives we correspond with, I was offered the wonderful opportunity to review not just the DDR Tracer, but also the DDR2 as well. Both kits appear similar to the untrained eye, but the end user should know that neither is interchangeable, each supporting a different standard. Seen below are both kits of the Tracer with the DDR above the DRR2. Also, see thumbnail of the comparison between the DDR and DDR2 pins, don't get the wrong kit for your motherboard.
The Crucial Tracer Ballistix DDR is a 184 pin part, supporting motherboards that utilize DDR1 SDRAM memory for desktop computers. Ballistix Tracer 184-pin DIMMs are available in PC4000 DDR (DDR500) 512mb and 1GB SDRAM modules.
The Crucial Tracer Ballistix DDR2 is a 240 pin product that is intended for motherboards that interface with DDR2 memory modules such as Intel 915, 925X, and 925XE chipsets. The Ballistix Tracer DDR2 is available in both 512mb and 1GB DDR2 PC2-5300 (DDR2 667) SDRAM Modules.
Onto our test setups -->