GeForce RTX 50 flagship GPU rumored to feature GDDR7 memory and 384-bit bus

Tipster Kopite7kimi said that Nvidia's next-generation GeForceRTX50 "Blackwell" gaming GPU flagship version is expected to support GDDR7 video memory, and the GPU architecture is somewhat different from next year's architecture for HPC and AI customers. Currently, there is a roadmap pointing to a launch in 2025, but rumors suggest that the latest graphics lineup may not be seen until the end of 2024.

Today’s topic is to discuss the video memory configuration. According to Kopite7kimi, the video memory configuration will use the latest GDDR7 video memory standard. GDDR7 video memory will evolve the GDDR6 and GDDR6X standards, with faster pin speeds and denser capacities. When initially released, a 24Gb module will be used, with a speed of approximately 32Gbps. These chips are expected to be available in 2024. A faster revision is planned for 2026, but Nvidia can't wait that long to use the latest memory technology. Instead, this will be adopted by new or updated series.

Here is the bandwidth provided by 32Gbps pin speeds in various bus configurations:

128bit@32Gbps: 512GB/sec

192-bit@32Gbps: 768GB/sec

256-bit@32Gbps: 1024GB/sec

320-bit (32Gbps): 1280GB/sec

384-bit 32Gbps: 1536GB/sec

512-bit (32Gbps): 2048GB/sec

Although the specific memory configuration of the Nvidia GeForce RTX50 flagship GPU was not mentioned, it was mentioned that the graphics card will use a 384-bit bus interface. It seems that 512-bit may no longer be a planned board, or it may only be for a higher-end variant. The 384-bit memory bus indicates that we will get the same 24GB VRAM or 36GB depending on the DRAM density used. At a speed of 32Gbps, the 384-bit bus interface will provide up to 1.5TB/s bandwidth, an increase of more than 50% over the existing RTX4090 GPU.

Kopite7kimi also said that Nvidia's GeForceRTX50 flagship GPU will use a public version design similar to the "GeForceRTX4090Ti" GPU that has been leaked many times. The card uses a four-slot cooling solution and has a unique side-mounted PCB design, with power cables routed through a large copper ring around the body.