Oki Electric, in June 1989, began selling two new workstation models. The 4/50 was a high-performance workstation that was standard equipped with a GX graphics accelerator and added a newly custom designed SPARC processor to the OKITAC S series, which had been supplied by Sun Microsystems Japan as OEM. The 4/25 was an entry-level workstation that was optimized as an extremely affordable diskless client computer. The final model, the 4/75, came with the GXplus graphics accelerator and featured upgraded network performance by offering for the first time the PrestoServe S-Bus accelerator, which increased the throughput of the network file system that made file access transparent.
| 4/25 | 4/50 | 4/75 | |
|---|---|---|---|
| Processor | SPARC CPU/FPU (33 MHz) single chip | SPARC CPU/FPU (40 MHz) single chip | SPARC IU (40 MHz) SPARC FPU (40 MHz) |
| SPEC marks | 20.1 | 24.2 | 24.7 |
| MIPS | 21.0 | 28.5 | 28.5 |
| megaFLOPS | 3.0 | 4.2 | 4.2 |
| Memory | 8M − 64MB | 16M − 64MB | 32M − 128MB |
| Hard drive | - | 207MB | 424MB |
