I keep hearing that, but that's simply not true. SSDs are fast, but they're several orders of magnitude slower than RAM, which is orders of magnitude slower than CPU Cache.
Samsung 990 Pro 2TB has a latency of 40 μs
DDR4-2133 with a CAS 15 has a latency of 14 nano seconds.
DDR4 latency is 0.035% of one of the fastest SSDs, or to put it another way, DDR4 is 2,857x faster than an SSD.
L1 cache is typically accessible in 4 clock cycles, in 4.8 ghz cpu like the i7-10700, L1 cache latency is sub 1ns.
Samsung 990 Pro 2TB has a latency of 40 μs
DDR4-2133 with a CAS 15 has a latency of 14 nano seconds.
DDR4 latency is 0.035% of one of the fastest SSDs, or to put it another way, DDR4 is 2,857x faster than an SSD.
L1 cache is typically accessible in 4 clock cycles, in 4.8 ghz cpu like the i7-10700, L1 cache latency is sub 1ns.