Dell R710 RAM Upgrade – Making sure I get this right

I have a Dell R710 that's refurbished (so no warranty or support by Dell) and currently has 48 GB of RAM in it (12x4GB). According to the smbiosDump in ESXi, it looks like this:

# smbiosDump | egrep '(Number:|Location)'
    Location: "DIMM_A1"
    Part Number: "36JSZF51272PZ1G4F1"
    Location: "DIMM_A2"
    Part Number: "36JSZF51272PZ1G4F1"
    Location: "DIMM_A3"
    Part Number: "HMT151R7BFR4C-H9"
    Location: "DIMM_A4"
    Part Number: "36JSZF51272PZ1G4F1"
    Location: "DIMM_A5"
    Part Number: "36JSZF51272PZ1G4F1"
    Location: "DIMM_A6"
    Part Number: "M393B5170EH1-CH9"
    Location: "DIMM_A7"
    Location: "DIMM_A8"
    Location: "DIMM_A9"
    Location: "DIMM_B1"
    Part Number: "36JSZF51272PZ1G4F1"
    Location: "DIMM_B2"
    Part Number: "36JSZF51272PZ1G4F1"
    Location: "DIMM_B3"
    Part Number: "HMT151R7BFR4C-H9"
    Location: "DIMM_B4"
    Part Number: "36JSZF51272PZ1G4F1"
    Location: "DIMM_B5"
    Part Number: "36JSZF51272PZ1G4F1"
    Location: "DIMM_B6"
    Part Number: "M393B5170EH1-CH9"
    Location: "DIMM_B7"
    Location: "DIMM_B8"
    Location: "DIMM_B9"

As you can see, I have 6 open slots on the board so an entire channel is free for use. I'm currently using the "Optimized" mode, which according to the manual means I can fill this third channel with additional RAM.

I noticed that there's 3 different part numbers for the RAM on this server. These two (M393B5170EH1-CH9 and HMT151R7BFR4C-H9) appear to by Hynix RAM which is compatible. The third one is an unknown Samsung that I can't find anywhere.

So, my question is this: If I were to purchase additional RAM (the Hynix one linked above), is it safe to say that this will work? The manual for compatibility is confusing, so I want to get this right. I had purchased Corsair RAM (8 GB, 4xr8, 1333Mhz, ECC) but the server rejected it when I installed them, so I'd like to avoid repeating my mistake!