4 ms·
It was 7.14MHz m68000 vs 66MHz i486. CPU speed was no contest, but graphics performance was only just getting decent.
by kstenerud 5y ago
It was 7.14MHz m68000 vs 66MHz i486. CPU speed was no contest, but graphics performance was only just getting decent.
- andrewf 5y agoEven if the CPU was fast enough to do all the graphics work, getting those pixels to the framebuffer could be a bottleneck. See benchmarks on p287 of the same authors' Doom book at https://fabiensanglard.net/gebbdoom.pdf https://fabiensanglard.net/gebbdoom.pdf (https://fabiensanglard.net/gebbdoom/ https://fabiensanglard.net/gebbdoom/ if you'd like to pay for it): A 33Mhz 486 ran Doom at 7, 11, and 15 fps respectively on three graphics cards. A 66MHz 486 ran Doom at 8, 13, and 24 fps respectively on the same three cards. The cards would've been attached with the same bus: 8-bit AT bus at ~10MHz, 16-bit AT bus, and 33MHz VESA local bus. (The 66MHz CPU is "clock doubled" so same equivalence for accessing memory, cache beyond L1, etc). tl;dr if you had an older graphics card in your PC, it would be the bottleneck and having the CPU run faster may not have helped.