Multiple blue screens on GX270's

We are moving to Dells from a generic vendor.  So far we have received 40 Dells in and half of them is randomly blue screen with various stop errors.  We have the same software running on the generic computers and have not had a single blue screen.  I have updated the BIOS and have done multiple other things as well.  As anybody experienced something like this?  Any suggestions on what might be causing only Dells in my organization to be blue screening?  Or any suggestion or settings to possibly change.

Thanks

Rob Kirchoff