I favor Gigabyte boards also.
Summary of current systems:
GA-EP45-UD3P | Q9550 OC'd to 3.6 GHz (425 MHz X 8.5) C3 stepping
🙁
GA-EP45-UD3L | Q6600 OC'd to 3.6 GHz (400 MHz X 9)
GA-EP35-DS3P | E5200 OC'd to 3.78 GHz (315 MHz X 12)
GA-G41m-ES2L| E5200, stock, on loan to sis-in-law
Two have Crucial Ballistixs at 4-4-4-12 at 2.0 volts and two have Patriot at 4-4-4-12. Three Corsair PSU's and one Antec. All are Prime95 stable after 24 hour test runs.
If you look at all the reviews at newegg, almost every brand and model is averaging about 10% returns. I do
not believe the failure rate is that high. I think there's a lot of noob "don't have a freakin' clue, doesn't boot, must be the motherboard" builders out there.
I'm really curious about how many of those returned boards really are defective.
Ghislane has a good point about the DDR2-1066 memory.
Actually, there ain't no such thing as DDR2-1066 RAM. Got your attention now, yes?

DDR2-1066 RAM is simply DDR2-800 RAM that has been tested to run at the higher speed, usually at an increased voltage and more relaxed timings. Any good DDR2-800 RAM can do that. But if you
start with DDR2-1066, well ...
I suspect that it's like expecting to get a significant overclock from a factory overclocked video card.