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What to Expect from Nvidia Blackwell and the New RTX 4070

At the end of last December, the first information about the upcoming architecture appeared Nvidia Blackwell, which should replace the current Ada Lovelace. It still hasn’t even reached the mainstream yet, and we should expect the new RTX 4070 in 4 days. So far we have known about Blackwell that it should have a chiplet architecture and be manufactured using the 3nm process at TSMC. However, the latest behind-the-scenes information shows that it may be a little different, but rather than refuting previous information, it is more about making it more precise.

Regarding the chiplet architecture, for example, it looks like the GB102 chip for GeForce will continue to be a monolithic chip and not chiplet like AMD. However, this does not mean that we will not encounter chiplets at all. This architecture could appear within Blackwell for HPC chips (but probably not for standard GeForce). As for the manufacturing process, it is still expected to use TSMC’s 3nm process, which is 25% more expensive per wafer than the 5nm/4nm process. The question is how the chip area will change with the transition to a smaller process. A better process should mean a smaller chip, but the number of transistors will certainly increase again, which, on the contrary, increases the area.

The RT core should receive a rework, which should further increase performance in ray-tracing. There are no clear memories yet, because there are a lot of possibilities. It can still be GDDR6X, it can also be GDDR6W chips and maybe even a 512-bit memory bus, and GDDR7 memories, which should reach a speed of 36 Gbps, cannot be completely ruled out. If a 384-bit bus was deployed in their case, it would mean a memory throughput of 1728 GB/s.

It probably won’t surprise anyone that a frequency of over 3 GHz is expected, e.g. 96 MB of cache memory is also mentioned. Overall performance should double against the Ada Lovelace architecture, and the unanswered question is how the new cards will fare. Let’s hope that the manufacturer succeeds at least as well as with Ada Lovelace, which offers much higher performance for quite interesting consumption (for cheaper cards, consumption should even decrease between generations).

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