Although Nvidia's Blackwell GPU line-up should be mostly similar to Ada in terms of memory specifications, the flagship seems to be the exception. Instead of a 384-bit memory bus like the one used on the AD102 GPU, the successor, the GB202, is expected to feature a 512-bit memory bus.

Not long ago, kopite7kimi stated that the Blackwell GPU lineup would have the same memory buses as the Ada lineup. However, the leaker didn't clarify that the GB202 flagship GPU would be an exception. According to kopite7kimi, the GB202 will feature a 512-bit memory bus instead.

At least it should be like this now.

— kopite7kimi (@kopite7kimi) March 12, 2024

Moreover, the same leaker added that the second-tiered GPU, codenamed GB203, might have half as many cores as GB202, rumoured to pack 192 SMs in a multi-chip package. As such, the GB203 would pack 96 SMs (likely a monolithic design), and for the memory, it will stick to a 256-bit memory bus, which is also half of what the GB202 packs. As such, there might not be any GB20x GPU with a 384-bit bus.

These are all rumours for now, as no concrete evidence of Nvidia's Blackwell GPU plans has been presented, nor has Nvidia made any official announcements.

KitGuru says: If these rumours are proven correct, we'll see an even bigger difference in CUDA cores between the x02 and x03 Blackwell GPUs than in the Ada line-up. How do you think this will translate into the RTX 50 series graphics cards?

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