Please note that this post is tagged as a rumor .
NVIDIA GeForce RTX 5090 rumored to feature 448-bit memory bus
The upcoming flagship Blackwell graphics card is said to feature a 448-bit memory bus, out of the 512 bits available on the GB202 graphics processor. This is a new rumor suggesting a different memory configuration than previously discussed.
The GB202 Blackwell GPU is the flagship processor for the new family of GeForce RTX 50 series. It was initially rumored to feature a 512-bit memory bus, only to see rumors about a 384-bit memory bus later. However, leakers now claim that the GB202 does indeed have a 512-bit bus, though this configuration may not be used by the RTX 5090.
Panzerlied, the same leaker who revealed the RTX 5090 Founder’s Edition PCB design claiming it uses three parts (now also confirmed by Kopite7kimi), has now stated that the RTX 5090 is not using a 512-bit bus but a 448-bit one instead. This implies that the RTX 5090 may not use all 16 available memory modules, but only 14.
RTX 5090 rumored with 448-bit bus, Source: Chiphell
Assuming that NVIDIA sticks to the 448-bit memory bus, this suggests that the RTX 5090 would feature 28GB GDDR7 specs. Since the memory speed was also leaked a while ago and now we have the memory bus information, the bandwidth should be 1568 GB/s, regardless of the capacity. This represents a 50% increase over the RTX 4090.
GeForce RTX 5090 rumored memory specs
- 14x 8Gbit (2GB) GDDR7 modules
- 28GB total capacity
- 28 Gbps speed
- 1568 GB/s maximum memory bandwidth
The 28GB specs on the new flagship may not look as impressive as 32GB. However, this means that NVIDIA will still have room for potential “Ti/SUPER” upgrades in the future. In fact, the 512-bit memory may not be used by gaming GPUs, but instead offered for ProViz RTX (formerly Quadro) series, which can utilize a lot more memory capacity.
The last time NVIDIA had used a 448-bit memory bus was during the GTX 200 series era. Models like GTX 260 or GTX 276 featured 896 MB of memory. The 512-bit bus was used by GTX 280. The following launches were equipped with up to 384-bit bus (GTX 400 and newer).
| NVIDIA RTX 5090 vs. 4090 | ||
|---|---|---|
| VideoCardz.com | RTX 5090 FE | RTX 4090 FE |
| Picture | [To be Leaked] |  |
| GPU | GB202 | AD102 |
| Architecture | Blackwell | Ada Lovelace |
| Total SMs | Less than 192 | 128 |
| CUDA Cores (Assumed) | Less than 24576 | 16384 |
| Memory | 28 GB GDDR7 | 24 GB GDDR6X |
| Memory Bus | 448-bit | 384-bit |
| Memory Speed | 28 Gbps | 21 Gbps |
| Memory Bandwidth | 1568 GB/s | 1008 GB/s |
| Power Connectors | 1x 12VHWPR (16-pin) (?) | 1x 12VHWPR (16-pin) |
| Default TGP | TBC | 450W |
| Founders Edition Design | 2-slot, dual-fan | 3-slot, dual-fan |
| MSRP | 💰💰💰 | 1599 USD |
| Announcement Date | 2024 | October 12th, 2022 |
Source: Chiphell