The Ultra 1 was available in a variety of different specifications. Three different CPU speeds were available - 143 MHz (Model 140), 167 MHz (Model 170) and 200 MHz (Model 200). The Model 200 launched in August 1996 with a list price of US$27,000 for the Ultra 1 Model 200E.
Model numbers with an E suffix (Sun service code A12, internal codename Electron) had two instead of three SBus slots, and added a UPA slot to allow the use of an optional Creator framebuffer. In addition, the E models had Wide SCSI and Fast Ethernet interfaces, in place of the narrow SCSI and 10Base-T Ethernet of the standard Ultra 1 (service code A11, codename Neutron).
Ultra 1 uses 200-pin 5V ECC 60ns SIMM.
Similar Sun machines were the Netra i 1 servers which had the same chassis and the UltraServer 1/Ultra Enterprise 1 servers