ROPs (Render Output Unit) are very important for rendering more pixels, for higher resolutions. To my knowledge, there are only 2 consumer graphics cards with more than 64 ROPs, the GTX 1080 TI and the RTX 2080 TI. To double the pixel rate (GPU clock x ROP count) of my current Graphics card (R9 390), I'd need to buy either a super overclocked Navi RX 5700 XT, or (expensive) Nvidia cards such as the GTX 1080 TI, or RTX 2080 TI. My old R9 390 has the same number of ROPs (64) as most modern GPUs. Alternatively, AMD could just use much higher GPU core clocks, which in my view, would be a worse option. EDIT - just noticed that the Xbox X series GPU will have 80 ROPs, with a slightly lower clock than the Navi RX 5700 XT, so pixel rates of ~152,400 (1905 MHz x 80 ROPs) should be achievable for Navi 2X GPUs.