OK, so I should have asked before I went and bought a bunch of stuff.
I needed more RAM for a VM pen-test lab I'm whipping up for work. I figured I'm taking down the network so why not go all out and avoid the need to shutdown the server again. So I bought a pair of L5640's to upgrade my quad-core L CPU's in there now, a Mellanox 10Gbe NIC, and 24GB more RAM. Other than if one thing is bad I won't know what broke it, is there any issue if toss this into my ESXi box?
I also have a Cisco 3570-E waiting for my upgrade, too. I won't know if it works until the server NIC is working and I have compatible GBIC's and media.