AMD Radeon RX 7600 GPU Has Better Cache & VRAM Latency Than RX 7900 XTX
Chips and Cheese published their very in-depth review of AMD's Radeon RX 7600 GPU last weekend - a team member (Jiray) took it upon themselves to actually buy the card, since a sample unit was not supplied for evaluation. The site's exploration of this graphics processing unit on an architectural level revealed a couple of positive aspects - which comes as a minor surprise since the Radeon RX 7600 received a generally lukewarm reception upon launch at the end of last month. Thanks to the Radeon RX 7600's Navi 33 XL GPU being a monolithic chip it seems to outpace—in terms of cache and memory latency performance—chiplet-based designs as featured in the vastly more powerful (and expensive) Radeon RX 7900-series cards.
Factoring in the smaller space that the RDNA 3 Navi 33 die occupies - it seems that it gains an advantage over the flagship card. Chips and Cheese reports that AMD's RX 7900 XTX takes up to 58% longer to access and pull data from its pool of Infinity Cache, when contrasted with the recently released sibling. The RX 7600 GPU exhibits 15% lower VRAM latencies compared to the RX 7900 XTX when retrieving data from the onboard GDDR6 VRAM chiplets. The review points to a greater disparity between current high-end and mid-range cards when looking back at equivalent models from the preceding generation: "The difference is especially large with RDNA 3. With RDNA 2, the RX 6900 XT had 151.57 ns of Infinity Cache latency compared to 130 ns on the RX 6600 XT, or a 16.5% latency penalty for the larger GPU." Chips and Cheese reckons that AMD's Navi 31's "chiplet configuration may be causing higher latency."
Factoring in the smaller space that the RDNA 3 Navi 33 die occupies - it seems that it gains an advantage over the flagship card. Chips and Cheese reports that AMD's RX 7900 XTX takes up to 58% longer to access and pull data from its pool of Infinity Cache, when contrasted with the recently released sibling. The RX 7600 GPU exhibits 15% lower VRAM latencies compared to the RX 7900 XTX when retrieving data from the onboard GDDR6 VRAM chiplets. The review points to a greater disparity between current high-end and mid-range cards when looking back at equivalent models from the preceding generation: "The difference is especially large with RDNA 3. With RDNA 2, the RX 6900 XT had 151.57 ns of Infinity Cache latency compared to 130 ns on the RX 6600 XT, or a 16.5% latency penalty for the larger GPU." Chips and Cheese reckons that AMD's Navi 31's "chiplet configuration may be causing higher latency."
