Whether microprocessor or ram has higher response time?

Answer 1

I want to give an answer but I might be complicating this, so from this page:

"Latency Numbers Every Programmer Should Know"
https://gist.github.com/jboner/2841832

There's this chart, which includes the average time to execute 1 CPU instruction (not all instructions are equal) against cache, memory and other operations for an "average system" of the time:
http://norvig.com/21-days.html#answers

Notes:
RAM clocks and CPU clocks are intimately related.
On-die CPU cache is insanely fast.
DMA disconnects the CPU from memory involvement (skips it; you handle the memory controller)
Bus width (for double/triple/etc data rate) operation changes the rules a little.
RAM is stamped with CAS latency numbers (how many "clock cycles" needed to do things).

I still want to say "response to what" - but don't let that stop you; hopefully the linked data helps.

Answer 2

Could you clarify this question, include what type of operation you're asking about?

Otherwise, I could add all sorts of useless information trying to guess what you're comparing (DMA, cache, instructions, clocks, buses, etc)

Answer 3

depends what microprocessor and what ram

Answer 4

Thanks for your reply, really appreciate it.

Answer 5

it is a question from past exam paper " Whether response time of a microprocessor is greater or less than that of RAM?" This is all