We guaranty this kit will work in your machine. 

4pcs. 8GB PC12800 1600MHz ECC Module 

BRAND CMS

Lifetime exchange or repair warranty against manufacturing defects by Computer Memory Solutions Brand Computer Memory Solutions 

Compatible with: IBM System x3250 M5 5458-xxx 

Standard Memory: 4GB (Removable) 

Maximum Memory: 32GB 

Expansions: 4 Socket(s)