Ati crossfirex graphics cards9/4/2023 ![]() With AMD cards there is more lee-way you can, for example, match an HD 7950 with an HD 7970, although for optimal performance scaling it's again better to match both cards like for like. The driver will synchronize clock speeds if the two cards run at different frequencies. For Nvidia cards, you must match the same GPU so a GTX 670 with a second GTX 670. When selecting a second GPU, you should ensure it’s as similar as possible to the primary GPU.Ensure each card fits securely, with the retention clip popping into place and that you connect the necessary PCI-E 6/8pin power connectors to the graphics card.Despite losing half the potential bandwidth per card, the PCI-E 3.0 standard provides more than enough data throughput, leaving your graphics card performance unaffected. Using just the top (primary) slot will give the graphics card PCI-E 3.0 16x bandwidth, while using both slots splits the lanes such that both have PCI-E 8x. The two we are interested in for 2-way multi-GPU is the top slot and middle slot.The Maximus V Formula has three full size (16x) PCI-Express slots, colored in red.Our guide below covers those interested in setting up Nvidia SLI or AMD CrossFireX on an Intel Z77 motherboard such as the ROG Maximus V series (we've used the Maximus V Formula), equipped with a 3rd Generation Intel Core CPU with PCI-Express Gen 3.0 capable CPU (such as the Core i5-3570K or Core i7-3770K).
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