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6326DVD was using C revisions and later added own D1 and D2. To summarize revisions: first C1 and C3 seems to be limited to 4 MB, C5 can handle 8. SiS tried to provide some extras in control panels, nothing 3d related though. At least 6326 packs all the basic features needed for proper rendering of 90's 3d games. SiS claims 40 or 45 megapixel/s peak fillrate, which rarely corresponds with real world performance. 3d framebuffer color depth is limited to 16 bits and obviously dithered down from higher internal precision. Also alpha and scissored planes are tested at render output. Z-buffer is implemented with rejection of hidden pixels in front to back sorting. Vertex fog is properly blended with all surfaces. SiS later doubled those stages, perhaps in C3 already. The very first C1 revision features only one texture coordinate and blending stage and suffers from broken texture perspective correction and fails one advanced blending operation. These should not be related to such filtering optimization.Ħ326 did not have a promising start. #Java 3d clock not working driver#Exceptionally, some specific textures are showing excessive color banding, probably because driver chose wrong format, or additional dithering. For untrained eye no really bad filtering showed up in games. This optimization is similar to ATi for example, the precision of 6326 is on par with Rage Pro. ![]() The bilinear texture filter is thus considered "full speed" (think no more than 20% hit) and even "trilinear" often has acceptable performance drop.īilinear filter however is not smooth interpolation, but a gradual. It is supported by cache designed for holding eight samples needed for trilinear filter, using last recently used algorithm with estimated 90% hit rate. ![]() #Java 3d clock not working 32 bit#Texturing engine is flexible, handling rectangular shapes up to 512x512 and color formats from smallest palettes over mixed modes to 32 bit RGBA. Gouraud shading with dithering and specular highlights is calculated without any penalty. From setup unit 32 bit data with 13 bit tags are sent at once to the rasterizer. 6326 is on paper able to crunch 0.8-1 million 50 pixel big polygons per second, or even double the amount with 25 pixel polygons. ![]() Then there is a VLIW floating point primitive setup engine capable of triangle setup within 60 clocks. AGP revisions supports 133 MHz bus with basic DMA transfers and sideband addressing, yet the queue depth is only two. It is a bad sign when company concentrates on promoting interface rather than compute power of the chip itself. The only feature SiS promoted over others is their Turbo Queue, an optional command FIFO in local memory in case 42 stages of hardware queue were not enough. On the internet was circulating information about the 2d engine being limited to 4MB of memory, but this seems to be true only for legacy VESA modes. The AGP chip was a hit nonetheless, easily outselling earlier revisions. Which makes little sense to me, SiS at that time had to know performance of 6326 is too low to become gamers choice, but it still could be good multimedia product. #Java 3d clock not working full#In summer 1998 came 6326AGP with niche DVD features and TV-OUT thrown out and instead implements full AGP interface. 6326 has built in rather slow 175 MHz true color ramdac with texture look up table. From its first version 6326 had strong MPEGII decoder, later DVD revision just integrated MacroVision features. 6326 isn't some speed monster, rather cheap multimedia product not pretending to be something it is not. Did they think people will remember random numbers? Couldn't they come up with something better? Like Fragmaster 2000 Ultra or Napalm 3D Xplosion? I guess it would not fit well. Among those SiS drops it's 3d junior called 6326. In the middle of 1997 3d gaming craze hits full speed and market is supplied with products of witty names, sometimes not far from mass murder. And their all in one graphics engine called "6326" was part of this success even if many gamers frown upon it or even all graphics cores of SiS. At one moment SiS was the only company in the world besides Intel with a full portfolio of 3C technologies, including CPU, core logic, 3d graphics, connectivity and advanced wafer fabrication. In 1997 they introduced their own 3d accelerator, gaining a significant foothold with one million chips sold, and delivered world first motherboard chipset with integrated graphics core. It was not until 1995 that SiS entered the discrete graphics market with 2d chips 62xx. It steadily grew around core logic and multimedia products. Silicon Integrated Systems is a Taiwanese corporation founded in 1987. ![]()
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