I hope this is the right forum to post this question.

We have SLES 11 running on a DELL server.

My IT department ran an engineering analysis software, Abaqus, on a trial version of SLED and a trial version of Windows Server 2012 on a workstation, a Dell T5500, and found that the analysis completed in Windows 12% quicker than it did in SLED.

This surprised everyone as we expected Windows to lag behind Linux. Abaqus is certified to run on SLES 11. My question is, will applications built for SLES run the same in SLED?

Is SLED as robust as SLES or is it just a hacked down version of SLES?

I know its not fair to compare SLED against Windows Server. But both operating systems were running of a mid range workstation, so I would have expected comparable run times.