NVIDIA GeForce RTX 50 “Blackwell” GPU Rumors: GB202 & GB203 With Up To 512-bit, Utilize 28 Gbps GDDR7 Memory

More rumors surrounding NVIDIA's GeForce RTX 50 "Blackwell" Gaming GPUs have been reported by Koptite7kimi such as GPU SKUs & memory configs.

NVIDIA GeForce RTX 50 "Blackwell" GPUs Comprise of Flagship GB202 & GB203 Chips, Monolithic Design Expected With First-Gen Cards Likely Utilizing 28 Gbps GDDR7 Memory

Kopite7kimi has several new tidbits to share on NVIDIA's next-gen GeForce RTX 50 "Blackwell" GPUs and they may sound quite a bit different than the ones we heard in his previous posts. The RTX Ada lineup also saw similar rumors before its release which used to change almost every single day but there's a good reason why these specs change too often. NVIDIA, like all other GPU manufacturers, works on various configurations, SKUs, & models of a certain product before finalizing something. We have seen variants of the Ampere lineup which were rumored, never got to see the light of day, only to pop up in certain markets. We should keep these things in mind when looking at the next-gen lineup too.

NVIDIA GeForce RTX 50 Gaming GPUs Get Flagship GB202 & GB203 Dies, Speculation on Mono or MCM Designs

So starting with the details, the NVIDIA GeForce RTX 50 "Blackwell" B200 Gaming GPUs will kick off with the flagship GB202 and GB203. It is said that the GB202 is the full chip whereas GB203 will be half of GB202, similar to how the Ada AD103 is half of the full AD102 GPU. It remains unclear if the green team will leverage a chiplet or monolithic design. For the HPC/AI family, the GB100 is going to utilize a chiplet design (MCM) but the gaming GPU is yet to be verified.

I think GB203 is half of GB202, just like GB102 and GB100. But I don't know if GB202 has a multi chip package.

— kopite7kimi (@kopite7kimi) March 11, 2024

GB100 will. I don't think GB202 will.

— kopite7kimi (@kopite7kimi) March 11, 2024

Blackwell Flagship Now Gunning For 512-bit Memory, Up To 32 GB & 1.8 TB/s Bandwidth Possible

Interestingly, Kopite7kimi now states that the flagship GB202 "Blackwell" Gaming GPU is now going to feature a 512-bit memory interface compared to the 384-bit memory interface on the flagship Ada GPU, the AD102. This can be a game-changer for the ultra-enthusiast segment as it not only offers higher memory bandwidth but it will also increase the memory capacity by a good amount. A 512-bit interface with 16 Gb (2 GB) modules will lead to 32 GB capacities with 1792.00 GB/s of total bandwidth.

I think my persistence is correct. So the difference is that GB202 is 512-bit and AD102 is 384-bit.

— kopite7kimi (@kopite7kimi) March 11, 2024

Yes.

— kopite7kimi (@kopite7kimi) March 11, 2024

And lastly, it looks like 28 Gbps GDDR7 memory modules will be the standard in the first gen products. Once again, NVIDIA is likely going to offer some variants with lower-clocked DRAM alongside the higher-end models which feature either 28 Gbps or the full 32 Gbps modules. If Kopite7kimi is correct, then that would change the memory hierarchy across all GeForce RTX 50 "Blackwell" GPUs quite significantly.

A 512-bit bus interface for GB202 would suggest that the follow-up would either use 384-bit or 256-bit memory and vice versa down the lane. What can happen is that we see some GB202 variants with 512-bit memory and other products being cut down to 384-bit to make room for more cost-effective models. Or the same can be the case with GB203 which might get both 384-bit and 256-bit variants.

Thanks as always. GB203 is 256-bit and GB205 is 192-bit.

— kopite7kimi (@kopite7kimi) March 12, 2024

It is also mentioned that the GB205 GPU which is the successor to the AD104 should retain a 192-bit bus interface.

• GB202 - 512-bit / 28 Gbps / 32 GB (Max Memory) / 1792 GB/s (Max Bandwidth)
• GB202 - 384-bit / 28 Gbps / 24 GB (Max Memory) / 1344 GB/s (Max Bandwidth)
• GB203 - 256-bit / 28 Gbps / 16 GB (Max Memory) / 896.0 GB/s (Max Bandwidth)
• GB205 - 192-bit / 28 Gbps / 12 GB (Max Memory) / 672.0 GB/s (Max Bandwidth)
• GB206 - 128-bit / 28 Gbps / 8 GB (Max Memory) / 448.0 GB/s (Max Bandwidth)
• GB207 - 128-bit / 28 Gbps / 8 GB (Max Memory) / 448.0 GB/s (Max Bandwidth)

28Gbps.

— kopite7kimi (@kopite7kimi) March 11, 2024

Once again, these are just rumors but if NVIDIA does intend to launch its GeForce RTX 50 "Blackwell" GPUs later this year, then these are one of the many such stories that we'll be reporting on throughout this year to make sure you stay updated on the latest internal developments of the next-gen GeForce family for gamers.

NVIDIA GeForce GPU SKUs: