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Adaptec AHA-3950U2B

Code: 8463

Enterprise Storage Controller / SCSI Host Adapter

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The Adaptec AHA-3950U2B is one of the highest-end SCSI host adapters produced by Adaptec during the late 1990s. It was designed for servers, workstations, and professional storage systems where high-speed SCSI disks, tape drives, scanners, and RAID enclosures were common.

The AHA-3950U2B belongs to Adaptec's Ultra2 family, using the AIC-7897 controller. It provides two independent Ultra2 SCSI channels on a single 64-bit PCI card

Operating System Compatibility
  • DOS
  • Windows 95
  • Windows 98
  • Windows NT
  • Windows 2000
  • Linux
  • Solaris
  • NetWare
  • BSD
  • Mac OS (OEM versions)
Typical Uses

The AHA-3950U2B was commonly found in:

  • video editing workstations
  • medical imaging systems
  • audio recording studios
  • CAD workstations
  • file servers
  • enterprise RAID systems
  • scientific instruments

    • Dual independent Ultra2 LVD SCSI channels
    • Up to 80 MB/s transfer rate per channel
    • Supports up to 30 SCSI devices (15 per channel)
    • 64-bit PCI interface with bus-master DMA
    • Automatic SCSI device negotiation and termination
    • Tagged Command Queuing support
    • Bootable SCSI BIOS (SCSISelect)
  • Manufacturer: Adaptec
  • Model: AHA-3950U2B
  • Release Period: Approximately 1998–1999
  • Interface: 64-bit PCI
  • SCSI Standard: Ultra2 LVD SCSI
  • Chipset: Adaptec AIC-7897
  • PCI ID: 9005:0050
  • Dual independent SCSI buses
  • Maximum Transfer Rate: 80 MB/s per channel (160 MB/s total theoretical bandwidth)
  • Supports up to 30 SCSI devices (15 per channel plus the controller)
  • Includes SCSISelect BIOS
  • Compatible with DOS, Windows 95, Windows 98, Windows NT, Windows 2000, Linux, Solaris, NetWare, BSD, and OEM versions of Mac OS
  • Designed for servers, workstations, RAID systems, and professional storage applications
  • Apple/Mac OEM versions were produced for certain Macintosh systems
  • Uses Ultra2 Low Voltage Differential (LVD) technology for improved speed, reliability, and cable length compared to earlier SCSI standards
  • Date code "9922" indicates manufacture around May–June 1999
  • Not a CPU; it is a specialized SCSI storage controller chip/adapter for connecting and managing SCSI devices