There is a 300W combined maximum for all PCI Express slots in these models as well. In the default configurations, one PCIe 2.0 x16 slot is occupied by the graphics card.
That interface offers some 8GB/s bandwidth between CPU and GPU, as long as the host system supports PCIe 4.0. The 'Early 2009,' 'Mid-2010,' and 'Mid-2012' Mac Pro models have four full-length PCI Express (PCIe) 2.0 expansion slots, two x16 slots and two x4 slots. That's right the host-to-GPU interface for the Radeon RX 6500 XT is PCIe 4.0 x4. Those same product pages also reveal another curious detail about the Radeon RX 6500 XT: it will only use four lanes of PCI Express connectivity to the host system. We did not find any impact for gaming or GPU-based rendering, but we did measure a small decline (less than 5) with video editing in DaVinci Resolve and a little bit larger drop (10) with. Those specs make it quite a small GPU, but specifications pages for products based on the full-sized Beige Goby indicate that it will require an 8-pin CPU power connector. In some applications, yes - there can be a small performance drop when running a PCI-Express 4.0 capable card in a system/slot that is only using PCIe 3.0. That chip comes with eight RDNA 2 WGPs (equivalent to 16 old-school CUs, giving it 1,024 stream processors), a boost clock of up to 2.6GHz, and 4GB of GDDR6 memory connected across a quite slim 64-bit bus. The card is based on the tiny Navi 24 GPU, codenamed Beige Goby.
The company didn't reveal many specifications about the new card, but thanks to earlier leaks as well as some clever deduction, we already know most of the relevant details. Did you hear about the Radeon RX 6500 XT? AMD announced the little video card on Tuesday at its pre-CES show.
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