The NV45 (GeForce 6800 Ultra) released by nVIDIA on June 28, 2004 is an NV40 with an AGP-to-PCI Express bridge. The implementation of the PCI-E interface standard gave birth to SLI (Scalable Link Interface) technology. 3dfx developed SLI (Scan Line Interleave) technology as early as 1995, and its original Voodoo graphics card (Obsidian SB50) reserved SLI interfaces. SLI technology can bridge two Voodoo graphics cards to obtain a 3D performance improvement, which is about 50% higher, which is equivalent to 1.5 voodoo cards.
3dfx Obsidian 100DB-4440 Qualification Sample
After nVIDIA acquired 3dfx , it improved the SLI technology and created an SLI model with a wide range of applications and high work efficiency with the aid of the new PCI-E interface. On the launch day of NV45 (GeForce 6800 Ultra), nVIDIA also announced the official promotional image of GeForce 6800 Ultra SLI.
GeForce 6800 Ultra SLI
nVIDIA first only released the high-end series of GeForce 6800 graphics cards to support this technology, and later it extended it to the full range of GeForce 6 series. In fact, the performance of the two cards in SLI mode is increased by about 50% on average, and low-end graphics cards are more efficient than high-end graphics cards.
On June 1, 2005, nearly a year after SLI was released, ATi finally responded with CrossFire technology. nVIDIA's SLI technology connects two identical graphics cards through a bridged daughter card, but ATi uses a DVI dedicated cable to connect the CrossFire Edition main card and the conventional graphics card. On the same day, ATi also announced the official promotional pictures of the Radeon X850 Crossfire Link.
Radeon X850 CrossFire
The performance of ati's two-card crossfire mode is improved by less than 50% on average. It is commonly known that the two-card crossfire is only equivalent to 1.5 graphics cards, which is almost the same as nVIDIA. ati's CrossFire technology requires a special CrossFire main card. Four chips including FPGA, ROM, DVI, RAMDAC, a special DVI interface, and complex DVI cables are added to the card. The cost is high and assembly is troublesome. This seemingly small design failure of CrossFire has caused the rapid loss of the hard-won high-end user base, which has a fatal impact on ati. In this round of N/A GPU fierce battle, ATi is very passive, and nVIDIA has become stronger since then.
X850 CrossFire master card Engineering sample