well sli memory is exactly "sli" memory
"The SLI ready 2GB kit from OCZ has the NVIDIA Enhanced Performance Profiles built in making it the best memory possible for use in nForce SLI based motherboards. These boards with a custom-designed BIOS, such as those designed for NVIDIA nForce SLI MCPs can boot at 800MHz with 4-4-4-15 1T timings right out of the box.
The exclusive NVIDIA XTC heat spreader gives the most efficient cooling possible. Airflow is optimized by creating micro-convection currents in what is normally dead space in conventional heat spreaders. The honey-comb design offloads heat quickly.
The fusion of the sophisticated EPP memory spec and cutting-edge, high-speed OCZ DDR2 architecture, the PC2-6400 edition is a major breakthrough for advanced SLI platform performance. " - new egg