It's because Noyce passed away before he got widely famous like eg Gordon Moore. Outside of tech circles Andy Grove never got quite as famous as Gordon Moore, due to Moore's Law. William Shockley is less famous than all of them. And none of which became remotely as famous as Gates, and those that have come along since. Noyce was a quiet giant.
Plus, to amplify that, there are a lot more software hackers here than hardware hackers.
When Noyce died in 1990, the computer revolution had only barely crawled out of the cave. Silicon Valley and the US were in a recession; SV's financial might and reach was tiny compared to what it is today. It was only in the late 1980s that computer sales finally took off, global PC shipments were ~9 million in 1987, ~20 million by 1990, and 100 million by 1998.
Look at the tech industry in, say, 1988:
Microsoft $590m in sales. Intel $2.8b in sales. Apple was at $4b in sales. Those were three of the giants, and all of those figures were huge increases over just a few years prior.
GM's sales by comparison in 1988, were $110 billion. The tech industry was tiny 30 years ago.
On a side note, the 1988 Intel annual report opens with a very neat 20 year anniversary walk-through of their technology history:
https://www.intel.com/content/dam/doc/report/history-1988-an...