AMD has introduced a set of latest cell GPUs at Computex this week. The brand new playing cards, that are all based mostly on its RDNA2 GPU household, will supply improved gaming efficiency and sizable Infinity Caches.
AMD retains the identical tactic in cell that we noticed the corporate use on desktop, specifically utilizing much less reminiscence bandwidth and compensating for the lower with a big L3 cache. The Radeon 6800M, 6700M, and 6600M will supply 192-bit, 160-bit, and 128-bit reminiscence interfaces, respectively. They’re backed with a 96MB, 80MB, and 32MB L3 cache.
A number of bits of knowledge the PCMag chart above doesn’t cowl. Board TGPs (Whole Graphics Energy) are 145W+, 80-135W, and 50-100W, respectively, and OEMs could have the choice to tune their targets. The clock speeds above are correct for a given energy output, however AMD will promote these chips into a spread of programs. TGP measures the overall output of the graphics card, not simply the GPU core. Second, reminiscence clocks: All of those GPUs embrace GDDR6 at as much as 16Gbps.
One distinction that you just want to remember when evaluating cell GPUs from Nvidia and AMD is between the 2 firms’ new messaging. For years, each Nvidia and AMD maintained totally different merchandise for cell and desktop, with cell merchandise differentiated by way of the “M” suffix or the phrase “Cell.” Immediately, Nvidia merchandise all carry the identical branding, desktop or cell.
AMD’s Radeon 6800 Cell is roughly equal to the 6700 XT, with considerably decrease clocks and what appears like higher total binning. We will’t actually examine with “145W+”, however the hole between the 6700M and the 6800M in different respects is modest. The 6700M affords a lot of the VRAM, reminiscence bandwidth, and clock of the 6800M, and a lot of the Infinity Cache as properly.
The stepdown from the 6700M to the 6600M is way sharper. The 6600M solely affords 32MB of Infinity Cache and a 128-bit reminiscence bus, although the GPU clock stays excessive. Once more, we see that AMD selected to emphasise excessive clocks and slim chips for RDNA2. It’d be fascinating to know extra in regards to the considering behind the design.
After we reviewed the 6700 XT earlier this 12 months, our IPC comparability between the 6700 XT and 5700 XT advised that the 6700 XT was very energy environment friendly compared to its predecessor, however not on the clock speeds AMD was concentrating on. After we reduce the 6700 XT all the way down to 1.85GHz, or roughly the clock velocity on our 5700 XT, energy consumption dropped sharply — by over 100W. AMD is undoubtedly binning extra aggressively extra cell in contrast with desktop, however we’re a little bit stunned the corporate didn’t go for wider, slower chips to raised compete with Nvidia.
AMD’s claims for efficiency wins are additionally fairly slim, particularly for benchmarks the corporate opted to publish itself. The hole between the 6600M and the RTX 3060 at 1080p appears a little bit bigger, in accordance with PCMag, however AMD isn’t arguing in favor of dramatic upsets right here.
AMD’s Ryzen 5000 CPUs have been fairly standard in desktop and cell programs in 2021, so we’ll see if the appearance of latest RDNA2-powered GPUs results in an uptick in all-Workforce Pink programs.