TYAN S1837 User Manual page 23

The Thunderbolt uses a 64-bit data path from memory to CPU and can
accommodate up to 2 GB of SDRAM. The 168-pin DIMMs (Dual In-line
Memory Modules) must be of the 3.3V, unbuffered variety. The position of the
notch in the SDRAM key position will tell you whether or not a DIMM is
unbuffered (see the Figure 2-5 below). All installed memory will be automati-
cally detected, so there is no need to set any jumpers.
Some details of memory installation:
• At least one unbuffered DIMM must be installed for the system to POST.
! ! ! ! !
• The mainboard supports 32MB, 64MB, 128MB SDRAM; and supports
256MB registered SDRAM DIMM modules. *
important!
S1837 Thunderbolt
Unbuffered
RFU
Buffered
Figure 2-4
Figure 2-5
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EEPROM