This article is a bit older (about 10 months), but I think it's definately a good material to read to all fo you SLI fan out there..
What Enhanced Performance Profiles Mean To You
NVIDIA announced the results of a collaborative memory development effort called Enhanced Performance Profiles, or EPP. EPP is going to change the way many computer users will use memory as it will allow for advanced performance memory settings to be built into high performance memory DIMMs for higher levels of overall PC system performance.
All DDR2 Unbuffered DIMM modules are required to include a Serial Presence Detect (SPD) EEPROM to allow them to be properly recognized by target systems. The contents of the SPD are defined by the JEDEC council. While the JEDEC SPD definitions have been used very effectively, they are not sufficiently comprehensive for overclocking applications. In such applications there are many parameters that are modified, and no provision exists in the JEDEC SPD specification to allow the system to make these changes automatically. NVIDIA has been able to take advantage of the unused area in the SPD and instersted usable data that will improve performance and increase the ease of use for many users.
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