SOYO SY-5SSM User's Manual & Technical Reference page 26

Hardware Setup
Step 5. DRAM Module Installation
This Motherboard supports three DIMM banks from 8 to 256 MB
with no other restrictions on memory configurations. You can install
the memory in any combination without having to rely on a memory
configuration table. Memory configuration is therefore "table-free" in
any memory bank.
This Motherboard supports SDRAM memory modules.
Note: If you plan on using the onboard VGA and intend to install
only one DRAM memory module, then this single DRAM must be
installed starting with bank DIMM1.
SY-5SSM & SY-5SSM/5 V1.1
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DIMM1
DIMM2
DIMM3