-Something like an R9 770X or whatever would be like 8 times stronger than the 7870 in the PS4
-16 or 32GB of HBM memory bringing the bandwidth to 1 or 2 TB/s
-An 8-core CPU clocked at 3 - 4.0 GHz with much better IPC than the PS4's cpu, and a second quad-core cpu for background tasks.
-Full backwords compatibility with the PS4.
-Expect the PS5 to perform as well at 4K as the PS4 does at 1080p now with the obvious advantage of much better effects/AI/Physics. 60 FPS should also be at least decently easier for the PS5 to do than it is for the current consoles (Due to the faster CPU and RAM).
-Possibly a 1 TB SSD for fast load times. Expect at least a hybrid solution.
What makes you think that's enough to do 4K at 30fps? Thats a 4x increase in resolution, while ps4 already has trouble maintaining 30 fps with a 2.25 increase in resolution.
I hope you're right because by 2019 I'll be all 4K, yet my gut tells me there will be another gen of upscaling 1440p/1600p before we get native 4K.
32GB memory sure, memory is not that expensive. 1TB SSD nah, easiest to keep the cost down by including a cheap HDD. Somehow I also expect to see a 16 core CPU before going back to 3-4 Ghz. More focus on GPGPU as well.