Here is the original message with the Kingston's answer :
Summary of your request
Part Number: KHX8500D2K2/4GR
Quantity: 2
Model: Maximus Formula Motherboard
Description:
Hi.
I would like to get 8 GB of Kingston HyperX RAM.
Unfortunately, Kingston does not provide 8 GB kit.
I would like to know if there is a danger in the compatibility or for the performance when buying two kits of KHX8500D2K2/4GR. Some people told me it would be better to get a 8 GB kit since the memory sticks are built and tested to work with each other and since the sticks are identicals.
I have an Asus Maximus Formula motherboard.
Thank you.
----------------
Dear **********,
Your only option is to install one or two at a time on this board. No, you will not have a problem running two kits of 4GB. However, as you may know, this memory is built with aggressive timings and may involve overclocking the motherboard. Because this practice is not endorsed by any motherboard manufacturer, we do not list it as compatible nor do we test for compatibility. You may have to install the memory and enter the memory timings in the BIOS manually to see if the motherboard will accept it.
If you have any other questions or concerns, please feel free to reply to this e-mail with full email history. Thank you for using Kingston on-line technical support.
Regards,
**********
I think I'm going to buy the HyperX kits. It seems reliable, fast, good quality heat spreader, good quality/price ratio and overclockable up to 1100 Mhz. Seems good to me and I don't have the risk of the 100 Mhz overclock to get a 500x8 CPU configuration when I'll overclock my processor.
Any other advices ?
Thank you.
Ghost26