Well one thing is for certain, the OCZ PC2-8500 4GB Dual Channel Reaper HPC Memory is fully compatible with the Gigabyte GA-EP35-DS3P and ASUS Blitz Formula Motherboards. The memory is definitely capable of exceeding it's rated specs. Given the complexities and obstacles associated with a 4GB kit, 1066 MHz is a worthy achievement in its own right. The 4GB Reaper kit remained completely stable throughout testing as well as passed several hours of further scrutiny from our trusty RST PRO 2 provided by Ultra-X. If there were any type of weaknesses in the memory, the RST PRO 2 would have definitely found them.