If you are running ANY type of Intel or 680/780i chipset DDR2 motherboard with 2x2GB for 4GB or 4x2GB for 8GB of ram, tRFC will have a major impact on how your system will run.

you may see option for tRFC called "Refresh to activate delay" so please don't be fooled. If your bios only goes as high at 42 you are going to have issues with speeds much over 900MHZ, in some cases some boards even have issues at 800MHZ.

We have changed SPD on many of our 2GB modules to set tRFC to 54 leaving the bios option at Auto, you do NOT need this SPD if your motherboard has this option in bios and it sets higher than 42, only ask for this update if you have a board that sets 42 or lower AND you can supply the SPD file to us off the modules you have showing a tRFC values of lower than 54 clocks.(we will supply the tool that allows you to send SPD to us)

tRFC has a massive impact on stability with 4 and 8GB kits due mainly to the massive increase in density and the way the memory has to be refreshed, most boards were originally setup for 1GB modules, this is the reason why some set tRFC to low for 2GB modules to work well.

Please if you have bought a 4GB kit and you are having issues look for tRFC in bios and set to at least 54 Clocks, in many cases you will see that you can lower voltage to the memory quite dramatically....

more news soon.