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EVGA P55 Classified 200
Max Support: 3x
One common misconception about ultra high-end motherboards is the PCI Express slot layout. Everyone seems to find it necessary to occupy all seven available slots with some sort of expandability, even if they won't ever, or cannot ever be used. This seems to be the case with the P55 Classified.
The nVidia NF200 is what they call a PCI Express multiplier chip that will basically split PCI Express 2.0 lanes into their 1.0 counterpart. (eg 16x @ 2.0 = 32x @ 1.0) and ironically enough the NF200 has 32x lanes available. Those lanes can then control up to four expansion slots with 8x of bandwidth each. There are several positives to using a NF200 chip in a multi-gpu configuration; the most common is to help divide bandwidth across an odd number of expansion slots, which is what EVGA is doing with the P55 Classified 200.
Sadly we had issues when trying to occupy all of the available PCI Express slots with a video card. It was tested, and it wasn’t pretty. In fact, trying to install a fourth video card required that all of the non-essential devices, including audio, LAN 1 and 2, eSATA, etc. be disabled in order to boot. This would indicate that the board just does not have enough IRQ addresses to support that many cards, or that the NF200 chip was shutting down because it didn’t have enough bandwidth.