If the RTX 4090 and RX 7900 XT and XTX have the same amount of GDDR6, why does the 4090 outperform the 7900?

Question

I’ve been looking at upgrading my PC in a few months, not to anything this powerful (but a man can dream) and in looking at GPU comparisons I see that the 4090 tends to be streets ahead of the RX 7900’s in terms of performance. Why is that if they have the same amount of memory?

In: 2

Answer 1

Because they have different processing units. You know, the RTX 4090 and the RX 7900 part of their name. Just like how RAM is just one part of what describes the compute performance of a PC, the (V)RAM is also only one part of what makes a GPU.