VPro, also known asOdyssey, is a computer graphics architecture forSilicon Graphicsworkstations. First released on theOctane2, it was subsequently used on theFuel andTezro workstations and theOnyx visualization systems, where it was branded InfinitePerformance.

VPro provides some very advanced capabilities such as per-pixel lighting, also known as "phong shading", (through the SGIX_fragment_lighting^[1] extension) and 48-bitRGBA color. On the other hand, later designs suffered from constrained bandwidth and poorer texture mapping performance compared to competing GPU solutions, which rapidly caught up to SGI in the market.^[2]

Four different Odyssey-based VPro graphics board revisions existed, designated V6, V8, V10 and V12. The first series were the V6 and V8, with 32MB and 128MB of RAM respectively; the V10 and V12 had double the geometry performance of the older V6/V8, but were otherwise similar. The V6 and V10 can have up to 8MB RAM allocated to textures, while V8 and V12 can have up to 108MB RAM used for textures. The V10 and V12 boards used in Fuel, Tezro and Onyx 3000 computers use a different XIO connector than the cards used in Octane2 workstations.

The VPro graphics subsystem consists of an SGI proprietary chip set and associated software. The chip set consists of thebuzzASIC, thepixel blaster and jammer (PB&J) ASIC, and associatedSDRAM. The buzz ASIC is a single-chip graphics pipeline. It operates at 251 MHz and contains on-chip SRAM. The buzz ASIC has three interfaces:

• Host (16-bit, 400-MHz peer-to-peer XIO link)
• SDRAM (The SDRAM is 32 MB (V6 or V10) or 128 MB (V8 or V12); the memory bus operates at half the speed of the buzz ASIC.)
• PB&J ASIC

As a result of a patent infringement settlement, SGI acquired rights to some of theNvidia Quadro GPUs and released VPro-branded products (the V3, VR3, V7 and VR7) based on these (the GeForce 256, Quadro, Quadro 2 MXR, and Quadro 2 Pro, respectively). These cards share nothing with the original Odyssey line and could not be used in SGI MIPS workstations.^[3]

All VPro boards support theOpenGL ARB imaging extensions, allowing for hardware acceleration of numerous imaging operations at real-time rates.

• Silicon Graphics Octane2 : Graphics at theWayback Machine (archived 7 January 2010)

• Graphics chips
• SGI graphics
• Computer-related introductions in 2000

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