Reminiscence bandwidth is likely one of the most vital specs that determines a graphics card’s efficiency potential. It displays the utmost knowledge throughput fee between the GPU chip itself and its reminiscence packages. That is why {hardware} nerds like us are at all times fairly eager to listen to what the ultimate delivery reminiscence velocity will likely be for brand new GPUs. For AMD’s upcoming RDNA 3-based Radeon RX 7000 household, we have heard conflicting rumors, however Greymon55 is right here to set us straight: it will prime out at 20 Gbps.
The bandwidth is calculated by taking the width of the reminiscence bus and multiplying it by the per-pin switch fee of stated reminiscence packages and is often expressed when it comes to gigabytes-per-second. Clearly, the potential switch fee of the DRAM ICs surrounding the GPU package deal is a vital ingredient of this equation.Â
Replying to VideoCardz, Greymon55 confirms that the Radeon RX 7900 XT, anticipated to be the top-end SKU in AMD’s subsequent graphics card household, will use 20 Gbps reminiscence. Assuming different leaks are correct, it would doubtless use twelve 2GB GDDR6 ICs for a complete of 24GB of video RAM operating at 20 Gbps throughout a 384-bit bus.
AMD’s extant RDNA 2 graphics playing cards are aggressive with NVIDIA’s Ampere household regardless of drastically decrease video reminiscence bandwidth. That is largely because of their use of huge on-die caches, which AMD calls “Infinity Cache.” Nevertheless, when purposes’ framebuffers exceed the capability of the Infinity Cache, as can occur often in excessive resolutions, efficiency falls off considerably.
The large soar in reminiscence bandwidth on AMD’s next-generation components could also be an try and alleviate these results considerably. It might even be an try to enhance efficiency in sure sorts of GPU compute workloads. Whereas the RDNA structure is targeted on gaming, the playing cards are nonetheless large compute accelerators, and it’s doable that some vendor or one other was disillusioned within the comparatively restricted reminiscence bandwidth of AMD’s current-gen playing cards.
In accordance with the leaks we have seen, the Radeon RX 7900 XT ought to be based mostly on the Navi 31 GPU. It’s anticipated to make use of a single massive Graphics Compute Die (GCD) together with six Reminiscence and Cache Cube, or MCDs. Every MCD has its personal 32MB of cache, which can give the RX 7900 XT as much as 192 MB of Infinity Cache, or probably even 384 MB if the rumors a few 3D V-Cache-equipped mannequin are correct.
It is vitally doubtless that the MCDs should run on the similar clock fee because the reminiscence, and it could possibly be that using 3D V-Cache is one other limiting issue on reminiscence switch fee. Regardless of the case, Navi 31 will definitely be the largest Radeon we have ever seen, and we’re completely right here for it—particularly contemplating AMD’s latest successes cleansing up its graphics driver.
