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The news about the increase in the number of shaders is not the only leak of Ada Lovelace today. On Twitter, @harukase5719 published a good summary and comparison table. Nvidia intends to significantly increase the L2 cache size of its new GPUs. The increase is so great that the current size of the L2 cache is negligible by comparison.
Starting with AD102, it includes up to 96 MB L2, compared to 6 MB in the current GA102. AD103 has up to 64 MB compared to 4 MB for GA103, and AD104 has 48 MB compared to 4 MB for GA104.
So let’s recap about Lovelace and Hopper… @kopite7kimi @xinoassassin1 pic.twitter.com/hioRcvn8fbMarch 2, 2022
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These increases drastically change the architecture and, if properly optimized, can provide very impressive performance gains not unlike what AMD was able to achieve with the similar Infinity Cache. This reduces the need for a significant increase in bandwidth that would be required to get the most out of all these shaders. Bus widths of 192, 256, and 382 bits, combined with a huge L2 cache, should be enough to cover the bandwidth requirements of RTX 40 cards. In theory, anyway. We need to test this for ourselves to know for sure.
So, Ada Lovelace’s cards seem to have a bit of everything. More shader cores (or CUDA cores, to use Nvidia’s naming convention), a lot more L2 cache, and higher clock speeds, thanks in part to TSMC’s 5nm process. Unfortunately, there are rumors of a similarly dramatic increase in power consumption, though we think the 850W rumors are nearly impossible for a consumer card. Don’t be surprised if you see 500 watts or more. It’s scary enough. Both Nvidia and AMD are getting ready to fight each other for the hearts, minds, and dollars of gamers. Along with AMD Zen 4 and 13th Gen Intel Raptor Lake, the second half of 2022 looks like time for a refresh.