Hi, I specifically registered here to confirm that GA-Z87-D3HP is extremely unstable with 4 memory slots used, which is evident from frequent fatal system crashes, also known as Blue Screen of Death (BSOD).
Here's a discussion with many users experiencing this problem on the Corsair forums:
http://forum.corsair.com/FORUMS/showthread.php?t=119923&page=4I shared my experience there. In short, I ordered a new PC 3 months ago, but got the aforementioned GA motherboard instead of the Asus I actually paid for. Wouldn't be a problem, if it was working. BSODs were occurring within 20 minutes of booting. After many days of driver and bios updates, OS reinstallation, component swapping and etc. I realized one simple thing - no crashes with 2 memory sticks (tested for 7 days). But as soon as all 4 Kingston modules were installed, BSOD within 20 minutes. The memory was thoroughly tested and replaced to rule it out. Finally, when I came across many other people describing similar experiences with the same motherboard, I had no more doubts - GA-Z87-D3HP rev 1.0 motherboard is faulty!
As soon as I requested the seller to swap it to the one I actually ordered in the first place (Asus Z87A), there were no more crashes with the same 4 memory sticks in 2 months of daily operation! Now I'm a happy owner of 32GBs of memory without any stability problems.
Searching Google reveals that too many people are having the same problem. The ones that are content would be those that don't use all 4 memory slots (the majority). But when they decide to upgrade in the future, they'll be out of luck. Gigabyte, do the right thing and issue a recall.