It’s hard to believe my Asus P6X58D-E built is almost 10 years old. Over the years I’ve upgraded it to its limit, but it’s still going strong except 24GB RAM limit. Then I stumbled up on some posts about how X58 chipset is capable of handing 8GB DDR3 module, which makes the limit to 48GB. Even though Asus states P6X58D-E max RAM is 24GB, I took a $150 gamble for six 8GB DDR3 and it worked out beautifully. Now my built should last me a few more years.