According to recent data, GeForce RTX 40 graphics cards won’t get PCIe 5.0 supportunlike Radeon RX 7000 adapters. But Nvidia cards will have another advantage.
According to the source, Ada Lovelace generation GPUs will be manufactured by TSMC in 4nm (4N) process technology, while Navi 3x GPUs are said to be 5nm.
Considering that the Hopper GPUs that Nvidia recently introduced are also manufactured at 4 nm, the information looks reliable. However, it is worth noting here that the TSMC 4N process technology is only a slightly improved version of the 5N, so you should not expect cardinal differences. But with all the data on the incredible power draw of the GeForce RTX 40, any improvement in power efficiency for Nvidia would be very important.