I have installed Maximus IV Extreme- Z with 8 gb of mem and it worked great. After installing the Thermaltake CPU Cooler I have by accident bent the pins on the motherboard and I have managed to fix it. Now, I am able to overclock with only the first two slots of memory. When I upgrade the memory to 8 gb using the 4 memory slots, the computer will not boot and I get error 45 on the post. I have upgraded the bios and used other memory but in vain.