NVIDIA GeForce RTX 5090 Graphics Card rumored to feature Modified 448-bit Bus Interface for up to 28 GB GDDR7 memory. This speculation comes from Chiphell Forum member, Panzerlied, who had once teased a 512-bit bus and new PCB to fit 16 GDDR7 memory modules.
The GB202 GPU allegedly driving the newer NVIDIA GeForce RTX 5090 will see its configuration reduced slightly, but it is still a step up from what’s in the GeForce RTX 4090 in terms of memory spec too, the draftsman has warned.
More About NVIDIA GeForce RTX 5090
The NVIDIA GeForce RTX 5090 graphics card will, in simple terms, feature a cut-down version of the 192 SM chip, and is known as GB202 GPU. The GPU will also come with a cut-back memory configuration of a 448-bit bus interface (or 14 modules) that will have a max of up to 28 GB of GDDR7 memory. The full version of the GB202 GPU has, in comparison, a 512-bit interface while the new PCB is able to support up to 16 GDDR7 memory modules for a total capacity of 32 GB.
NVIDIA could launch 28 Gbps GDDR7 memory modules right out of the gate, hitting up to 1568 GB/s in the 448-bit configuration: 56% more bandwidth than the RTX 4090’s 384-bit @ 21 Gbps.
Among other things, a 512-bit interface would provide up to 1792 GB/s to the GPU (a 15% gain), so perhaps the 448 was chosen for thermal, power, and cost reasons. By going with a 256-bit bus and 16GB of memory, possibility a future model, including the workstation graphics card will use the full 512-bit interface and 32GB of memory, possibly more cores. Whether retail versions of the RTX 5090 stick with this specifying is up in the air.
The potential GeForce RTX 5090 will be part of the next-generation RTX 50 “Blackwell” gaming lineup, which NVIDIA is currently planning to launch sometime in the third quarter of the year. Alongside the RTX 5090, the lineup is rumored to include the RTX 5080, which may be the first to hit retail shelves, followed by the RTX 5090 a few weeks later.
