Also I designed a Mac graphics accelerator gate array back in the late 80s, we were worried that the promised VRAM performance would not be fast enough so I des

Also I designed a Mac graphics accelerator gate array back in the late 80s, we were worried that the promised VRAM performance would not be fast enough so I designed in the ability to add extra clocks to RAS and CAS timings - it ran at full speed which was great, but marketing wanted a lower price-point version of the graphics card so we sold one with a ROM that turned on those extra RAS/CAS clocks