160 byte framebuffer at 50 fps, internal RAM or external SRAM?

[CuriousOne]

Hello.
I'm doing a graphic project, where content of WS0010b OLED display will be updated really fast, 50fps at least.
The framebuffer size is 160 bytes. Will PBPs arraywrite/arrayread operations provide enough speed at 18F running at 64mhz, to read and write that array at that speed, or better to use external, parallel SRAM for that?

[tumbleweed]

Pretty much any external ram is going to be slower than internal storage.