Please correct me if any of this data is inaccurate. In the CPU column, the number in parentheses after the processor type is the amount of secondary cache the SC configuration of that processor has (Rx000PC processors have no secondary cache). There is probably at least some inaccurate CPU data. GE = geometry engine; RE = raster engine.

`model`	`years in production`	`CPUs available`	`graphics configs available`	`max resolution & monitor connector / sync`	`SCSI`	`network`	`RAM`	`keyboard / mouse`	`supported IRIX versions`	`replaced by`
`IRIS Indigo`	`1991-1994`	`33MHz R3000` `75MHz R4000PC` `100MHz R4000PC/SC (1024K - SC version can be used in an Indigo2)` `150MHz R4400SC (1024K - can be used in an Indigo2)`	`LG1 (8-bit)` `XS (8-bit, 1 GE)` `XS-24 (24-bit, 1 GE)` `XS-24Z (24-bit, 1 GE, hardware Z-buffer)` `XZ ("GR2-XZ" in hinv; 24-bit, 2 GE)` `Elan ("GR2-Elan" in hinv; 24-bit, 4 GE)`	`1024x768; HD15 / composite sync (LG1 only)` `1280x1024; 13W3 / sync-on-green (all others)`	`Fast SCSI-2 (1 internal bus, 1 external bus [CN50])` `the use of all internal buses requires proprietary drive sleds`	`1 AUI Ethernet port`	`? banks of ? proprietary SIMMs on R3000; ? banks of ? standard 72-pin parity SIMMs on R4x00`	`proprietary (also work with Onyx)`	`5.x for R3000; 5.x, 6.2, 6.5 for R4x00`	`Indigo2 & Indy`
`Indy`	`1993-1996`	`100MHz R4000PC/SC (1024K)` `100MHz R4600PC` `133MHz R4600PC/SC (512K)` `100MHz R4400PC/SC (1024K)` `150MHz R4400SC (1024K)` `175MHz R4400SC (1024K)` `200MHz R4400SC (1024K)` `150MHz R5000PC/SC (512K)` `180MHz R5000SC (512K)`	`8-bit XL` `24-bit XL` `XZ` `XGE (24-bit XL on an R5000)`	`1280x1024; 13W3 / sync-on-green`	`Fast SCSI-2 (1 internal bus, 1 external bus [HD50])`	`1 AUI Ethernet port; 1 10BaseT port (half-duplex); 1 ISDN port`	`2 banks of 4 slots for standard 72-pin parity SIMMs; 256MB max`	`PS/2 style`	`5.2, 5.3, 6.2, 6.5`	`O2`
`Indigo2`	`1993-1996`	`100MHz R4000SC (1024K - can be used in an R4K-ready Indigo) (green)` `100MHz R4400SC (1024k)` `133MHz R4600SC (512K) (green)` `150MHz R4400SC (1024K - can be used in an R4K-ready Indigo) (green)` `175MHz R4400SC (1024K) (green & purple)` `200MHz R4400SC (green & purple) (1024K or 2048K)` `250MHz R4400SC (green & purple) (2048K)` `75MHz R8000SC (purple) (2048K)` `175MHz R10000 (purple) (1024K)` `195MHz R10000 (purple) (1024K)`	`24-bit XL (green)` `XZ ("GR3-XZ" in hinv; 2 GE, green)` `XZ ("GR3-Elan" in hinv; 4 GE, green)` `Elan ("GR2-Elan" in hinv; 4 GE, green)` `Extreme ("GU1-Extreme" in hinv; 8 GE, green)` `Killer IMPACT (purple; see Indigo2 section below)` `Solid IMPACT (purple)` `High IMPACT (purple)` `Maximum IMPACT (purple)`	`1280x1024 on all but Maximum IMPACT; 1600x1200 on Maximum IMPACT; 13W3 / sync-on-green`	`Earlier models: Fast SCSI-2 (1 internal bus, 1 external bus)` `Later models: Ultra SCSI (1 internal bus, 1 external bus [HD50])` `the use of all internal buses requires proprietary drive sleds`	`1 AUI Ethernet port; 1 10BaseT port (half-duplex)`	`3 banks of 4 slots for standard 72-pin parity SIMMs; 384MB max on R4x00` `SGI says 640MB is the max on R8K and R10K (using 64MB SIMMs in two banks and 32MB SIMMs in the other), but SGI is wrong - 768MB is possible (64MB SIMMs in all 12 slots)` `Update: Up to 1GB is possible on R8K and R10K. See this page. (Thanks to Ron Dujinski and Ian Mapleson)`	`PS/2-style`	`5.2, 5.3, 6.2, 6.5 for non-IMPACT, non-R10000 systems; 6.2 w/ IMPACT 10000, 6.5 for IMPACT/R10000 systems`	`Octane`
`O2`	`1996-present`	`150MHz R5000PC/SC?` `180MHz R5000PC/SC` `200MHz R5000PC/SC` `150MHz R10000SC (1024K)` `175MHz R10000SC (1024K)` `195MHz R10000SC (1024K)` `225MHz R10000SC (1024K)` `250MHz R10000SC (1024K)` `300MHz RM5200SC (QED MIPS clone)` `270MHz R12000(A?)` `300MHz R12000(A?)` `400MHz R12000A` `R12000 processors have 1MB of secondary cache; R12000As have 2MB.`	`CRM`	`1280x1024 or 1600x1024; HD15 / composite sync`	`Ultra-Wide SCSI (1 internal bus, 1 external bus [HD68])`	`1 10/100 Ethernet port`	`? banks of ? slots for proprietary SDRAM DIMMs; 1GB max; DIMMs must be installed in pairs`	`PS/2-style`	`6.3, 6.5`	`nothing yet`
`Octane`	`1997-present`	`175MHz R10000SC (1024K per CPU; single/dual)` `195MHz R10000SC (1024K per CPU; single/dual)` `225MHz R10000SC (1024K per CPU; single/dual)` `250MHz R10000SC (1024K or 2048K per CPU; single/dual)` `270MHz R12000A (single/dual)` `300MHz R12000A (single/dual)` `R12000 processors have 1MB of secondary cache; R12000As have 2MB.` `CPUs must have matching speeds in dual-processor Octanes`	`SI (1 GE, 1 RE, uses 1 XIO slot)` `SSI (2 GE, 2 RE, uses 2 XIO slots)` `MXI (2 GE, 2 RE, hardware texturing, uses 2 XIO slots)` `SE (1 GE, 1 RE, uses 1 XIO slot)` `SSE (2 GE, 2 RE, uses 2 XIO slots)` `MXE (2 GE, 2 RE, hardware texturing, uses 2 XIO slots)` `S* graphics can be upgraded to hardware texturing but do not support it by default` `I graphics are 1st generation, derived from Solid/High/Max IMPACT; E graphics are 2nd generation and substantially superior`	`SI:` `SSI:` `MXI:` `SE: 1280x1024 @ 72Hz` `SSE & MXE: 1600x1200 or 1920x1035 @ 60Hz`	`Ultra-Wide SCSI (1 internal, 1 external [HD68])`	`1 10/100 Ethernet port`	`4 banks of 2 slots for 8 SDRAM DIMMs; 4GB (8GB?) max`	`PS/2-style`	`6.4, 6.5`	`Octane2? As of 11/2000, SGI is selling both.`
`Octane2`	`2000-present`	`400MHz R12000A (2048K per CPU; single/dual)`	`V6 (32MB RAM, 8MB TRAM max)` `V8 (128MB RAM, 104MB TRAM max)`		`Ultra-Wide SCSI (1 internal, 1 external [HD68])`	`1 10/100 Ethernet port`	`4 banks of 2 slots for 8 SDRAM DIMMs; 4GB max`	`PS/2-style`	`6.5.?`	`nothing yet`

The views and opinions expressed in this page are strictly those of the page author.
The contents of this page have not been reviewed or approved by the University of Minnesota.

The views and opinions expressed in this page are strictly those of the page author.The contents of this page have not been reviewed or approved by the University of Minnesota.

The views and opinions expressed in this page are strictly those of the page author.
The contents of this page have not been reviewed or approved by the University of Minnesota.