Posted 30 August 2014 - 06:26 AM
That's a shame. Taking the warning in the manual at face value, I don't think that kit will work with your existing memory. You may need to replace it all (and perhaps sell on the existing kit). Non matching memory can work but more often than not you will have problems. These can range from a system which won't boot at all, to stability problems that only show in certain circumstances.
Your existing memory is rated to 2000mhz. But it doesn,t have to run at that speed. It will probably default to 1333mhz for compatibility reasons, and increases over that have to be set manually. Memory speed is set in BIOS and it is set as a multiplier of the base clock speed. For example if your base clock is 133mhz, which I think is the default on your processor, to set to 1333mhz you set the speed to 10 x the base clock. Some times these higher memory speeds like 2000mhz are only achievable by overclocking the processor (by increasing the base clock speed).
The short answer is, if you replace your memory, if you clear the Cmos using the reset jumper, it will reset any memory speed settings to a "safe" setting which will probably be 1333mhz.