The server has  Two x8 PCIe Gen2 slots One x4 PCIe Gen1 slot dedicated for the integrated storage controller card You should be able to install a x1 card into a x8 slot. I do not have any 3rd party compatibility chart for eSATA cards, so can't say if the card will operate properly or not. Let us know what you find. Thanks.
Hi there, We have a requirement to fit an eSATA card into a new dell r410 server. Can anyone tell me if an PCIE x1 card will work in this server? Specifically I was looking at a startech PEXSAT31E1 Thanks for any help with this. Huw   PS - our server has the following configuration.      
eSATA card for r610