The Hardware Research 750/233 was a performance-oriented Mac OS clone designed for professional applications requiring stability, speed, and rackmount compatibility. Released in mid-1998, it featured a 233 MHz PowerPC 750 (G3) processor, 80 MB of RAM, and a 3.1 GB SCSI hard drive, delivering reliable power for server rooms, A/V editing environments, and scientific use.
Built on the Tsunami architecture, also used in Apple’s high-end Power Macintosh 9500 series, the Hardware Research 750/233 added a strong graphical edge with its 8 MB ATI XCLAIM 3D video card—exceptional for its time. It also supported dual-processor upgrades, allowing professionals to future-proof their setups.
This model officially supported Mac OS 7.5.5 through 8.1, and was compatible with Mac OS 9.0 unofficially. Priced at $3,850 USD, the 750/233 stood out as an affordable yet powerful G3-based rackmount Mac alternative.
Hardware Research 750/233 – Technical Specifications
| Specification | Details |
|---|---|
| Introduction Date | June 1, 1998 |
| Discontinued Date | December 31, 1998 |
| Processor Type | PowerPC 750 (G3) |
| Processor Speed | 233 MHz |
| FPU (Integrated) | PowerPC 750 (G3) |
| System Bus Speed | 46.6 MHz |
| Backside Bus Speed | 116.5 MHz |
| ROM Size | 4 MB |
| Data Path | 64-bit |
| Level 1 Cache | 64 KB |
| Level 2 Cache | 512 KB (backside) |
| RAM Type | 70 ns 168-pin DIMM |
| Standard RAM | 80 MB |
| Maximum RAM | 1040 MB |
| RAM Slots | 8 (supports interleaving for enhanced performance) |
| Standard VRAM | 8 MB (ATI XCLAIM 3D) |
| Maximum VRAM | 8 MB |
| VRAM Type | Video card |
| Hard Drive | 3.1 GB SCSI |
| Standard CD-ROM | 12X |
| Floppy Drive | 1.44 MB (manual eject) |
| Modem | N/A |
| Ethernet | AAUI, 10Base-T |
| Case Type | Rack-Mountable |
| Form Factor | 19″ Rackmount |
| Expansion Slots | 6 PCI |
| Expansion Bays (Free) | 1 external 5.25″ bay |
| Battery Type | 3.6V Lithium |
| Built-in Display | None |
| Supported Mac OS | 7.5.5 to 9.0 (officially up to 8.1) |
| Dimensions | 10 x 17.25 x 17.75 inches (H x W x D) |
| Average Weight | 52 lbs (23.6 kg) |
| Original Price | $3,850 USD |
| Estimated Current Value | N/A – Rare collector’s unit |
| Architecture | Tsunami (used in Power Macintosh 9500) |
Why the Hardware Research 750/233 Was Ahead of Its Time
The Hardware Research 750/233 balanced affordability with performance, offering a rackmount Mac OS system at a lower price point than most dual-CPU configurations, while still supporting future upgrades. Its G3 processor, high-speed backside cache, and 8 MB VRAM made it ideal for resource-intensive tasks and visual computing needs.
As one of the final entries in Apple’s clone licensing era, it remains a favorite among vintage Mac collectors and professionals who valued modularity and rack-based deployment.
