NVIDIA GeForce RTX 5090 graphics cards are rumored to have a cut-down 448-bit bus interface for up to 28 GB GDDR7 memory.
NVIDIA GeForce RTX 5090 Rumored To Get Cut-Down 448-Bit Bus Interface & 28 GB GDDR7 Memory
The new rumor comes from Chiphell Forum member, Panzerlied, who had previously stated the 512-bit bus interface and the new PCB design incorporating 16 GDDR7 memory modules. As per the latest information, the GB202 GPU featured on the NVIDIA GeForce RTX 5090 will come in a slightly cut-down configuration which would still mark an upgrade over the memory spec of the GeForce RTX 4090.
So starting with the details, the NVIDIA GeForce RTX 5090 graphics cards will feature a cut-down GB202 GPU with fewer cores than the fully enabled 192 SM chip. The GPU will also feature a cut-down memory configuration, featuring a 448-bit bus interface or 14 modules for up to 28 GB of GDDR7 memory capacities.
For comparison, the full version of the GB202 GPU will be equipped with a 512-bit interface and the new PCB will house up to 16 GDDR7 memory modules for up to capacities of 32 GB.
NVIDIA is also expected to utilize 28 Gbps GDDR7 memory modules from the get-go so if that is truly the case, we will see bandwidths of up to 1568 GB/s on the 448-bit configuration which is 56% more bandwidth than the RTX 4090 (384-bit @ 21 Gbps).
NVIDIA Blackwell 'GB202' GPU Specs 'Preliminary':
| GPU Name | GB202 | AD102 |
|---|---|---|
| GPC | 12 (Per GPU)? | 12 (Per GPU) |
| TPC | 8 (Per GPC)? | 6 (Per GPC) |
| SM | 2 (Per TPC)? | 2 (Per TPC) |
| Total SMs | 192? | 144 |
| Sub-Core | TBD | 4 (Per SM) |
| FP32 | 128 (Per SM)? | 128 (Per SM) |
| FP32+INT32 | TBD | 128 (Per SM) |
| CUDA Cores | 24,567? | 18,432 |
| Warps | TBD | 64 (Per SM) |
| Threads | TBD | 2048 (Per SM) |
| L1 Cache | TBD | 192 KB (Per SM) |
| L2 Cache | TBD | 96 MB (Per GPU) |
| ROPs | TBD | 32 (Per GPC) |
| Memory Standard | GDDR7 | GDDR6X |
| Max Memory Bus | 512-bit | 384-bit |
| Max Memory Cap | 32 GB | 24 GB |
A 512-bit interface would have given up to 1792 GB/s of bandwidth to the GPU which marks a 15% improvement though it should be a viable choice to stay within the thermal, power, and cost parameters. This opens up the room for a future model and even workstation graphics cards with the full 512-bit and 32 GB memory configuration and more cores. Still, we must wait and see if the retail RTX 5090 uses these specifications.
- GeForce RTX 5090 (Rumor) - 448-bit (512-bit full chip) / 14 GDDR7 Modules (16 Full) / 28 GB VRAM
- GeForce RTX 4090 (Official) - 384-bit (384-bit full chip) / 12 GDDR6X Modules (12 Full) 24 GB VRAM
NVIDIA's GeForce RTX 5090 GPU should be among the next-gen RTX 50 "Blackwell" gaming lineup unveiled which is planned for the second half of this year. The graphics card will be accompanied by the RTX 5080, rumored to be the first to hit the retail shelves, followed by the RTX 5090 a few weeks later.
NVIDIA GeForce RTX 50 "Blackwell" GPU Lineup (Preliminary) Specs:
| Graphics Card | GPU | Max GPU SMs / Cores | Memory Configuration | TDP |
|---|---|---|---|---|
| GeForce RTX 5090 Ti? | GB202 | 192 / TBD | 512-bit (GDDR7) | 450W? |
| GeForce RTX 5090? | GB202 | TBD / TBD | 448-bit (GDDR7) | 400W? |
| GeForce RTX 5080 Ti? | GB202 | TBD / TBD | 384-bit (GDDR7) | 350W? |
| GeForce RTX 5080? | GB203 | 96 / TBD | 256-bit (GDDR7) | 320W? |
| GeForce RTX 5070? | GB205 | TBD | 192-bit (GDDR7) | 225W? |
| GeForce RTX 5060 Ti? | GB206 | TBD | 128-bit (GDDR6?) | 160W? |
| GeForce RTX 5060 | GB207 | TBD | 128-bit (GDDR6?) | 120W? |
News Source: Videocardz
About the author: A Software Engineer by training and a PC enthusiast by passion, Hassan Mujtaba serves as Wccftech's Senior Editor for hardware section. With years of experience in the industry, he specializes in deep-dive technical analysis of next-generation CPU and GPU architectures, motherboards, and cooling solutions. His work involves not only breaking news on upcoming technologies but also extensive hands-on reviews and benchmarking.
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