S3420GP and RAM

Hello,

I have a server mothebord S3420GP with 6 memory slots.

Now, I have 2 slots filled with these: 2x KINGSTON 4GB 1333MHz DDR3 ECC CL9 DIMM with Thermal Sensor.

Is possible to use another 4 these RAMs? So I would have 24 GB RAM with 6 x 4 GB. Is this combination possible?

Or is possible to use 4 x KINGSTON 8GB DDR3 1333MHz CL9 ECC Dual Rank BOX.

So total memory size will be 32 GB RAM.

Thanks for any answers.