These are old (320-520) SSDs we are using Intel 3500 &amp; 3700 DC series and haven&#x27;t had any issues. with few power outages in past few years.<p>840Pro is a consumer grade drive and has reduced guaranteed max write capacity and larger variance in quality from unit to unit. Instead you should use server type disks instead: <a href="http:&#x2F;&#x2F;www.samsung.com&#x2F;global&#x2F;business&#x2F;semiconductor&#x2F;minisite&#x2F;SSD&#x2F;global&#x2F;html&#x2F;why&#x2F;forDataCenter.html" rel="nofollow">http:&#x2F;&#x2F;www.samsung.com&#x2F;global&#x2F;business&#x2F;semiconductor&#x2F;minisit...</a> 
We use these in our analytics servers, they have stood up to test of time many times, and without any issues.
SSD tech evolves so fast that 3 years since release of model lineup seems like forever, especially in an intensive write prone environment(for example writing slows reading but by how much? DC level drives are way ahead in this and very consistent as per what we found out in our tryouts).