My Dell Precision 5520 was a big disappointment. In spite of having a Xeon CPU, Dell decided that this specific model would not get ECC RAM support. Other Dell

My Dell Precision 5520 was a big disappointment. In spite of having a Xeon CPU, Dell decided that this specific model would not get ECC RAM support. Other Dell laptops from that era using the same CPU do support ECC RAM, but then you have to give up portability. It's my most regretted laptop purchase.