Indigo2 R4400SC 200MHz (2MB L2) HighIMPACT-AA (1MB TRAM).
Note that 'AA' means this revision of HighIMPACT has 2 GEs instead
of one. Still just one RE though.

Iris Audio Processor: version A2 revision 1.1.0
1 200 MHZ IP22 Processor
FPU: MIPS R4000 Floating Point Coprocessor Revision: 0.0
CPU: MIPS R4400 Processor Chip Revision: 6.0
On-board serial ports: 2
On-board bi-directional parallel port
Data cache size: 16 Kbytes
Instruction cache size: 16 Kbytes
Secondary unified instruction/data cache size: 2 Mbytes on Processor 0
Main memory size: 128 Mbytes
EISA bus: adapter 0
Integral Ethernet: ec0, version 1
Integral SCSI controller 1: Version WD33C93B, revision D
Integral SCSI controller 0: Version WD33C93B, revision D
  Disk drive: unit 1 on SCSI controller 0
Graphics board: High-AA Impact

Graphics board 0 is "IMPACT" graphics.
        Managed (":0.0") 1280x1024 
        Product ID 0x0, 2 GEs, 1 RE, 1 TRAM
        MGRAS revision 2, RA revision 5
        HQ rev A, GE11 rev A, RE4 rev A, PP1 rev A, 
        VC3 rev A, CMAP rev D, MC rev C
        19" monitor (id 0x1)

        Channel 0:
         Origin = (0,0)
         Video Output: 1280 pixels, 1024 lines, 75.92Hz (1280x1024_76)