I am looking to add a PCIe V.2 RAID controller (LSI SAS 9280-4i4e) to an older Intel server (SR2500) which has PCIe V.1 slots.
Does anyone have any experience with using RAID controllers designed for PCIe V.2 in a PCIe V.1 server?
From the FAQ on pcisig.com the answer to Question 5 states that PCIe 2.0 cards must be backwardly compatible with PCIe 1.0 and 1.1. I haven't done this with PCIe cards yet, but the various flavours of 64 bit PCI (66, 100, 133) certainly demonstrated backwards compatibility in my previous experience. I'm typing this on a machine that has a PCIX-133 ASR-2200s card in a PCIX-100 slot.
If the FAQ is to be believed, in order to be compliant with the PCIe 2.0 standard a card must be backward compatible. I would be surprised to find your RAID controller doesn't work, especially on something with a mainstream motherboard chipset.