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September 21, 2022

Daily Tech News 21 September 2022

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  • Nvidia had its big announcement. (AnandTech)

    Lots of stuff, but the most immediately interesting are the RTX 4080 and 4090. (Tom's Hardware)

    The 4090, launching October 12, has twice the performance of the 3090 Ti - from 40 TFLOPs to over 80 TFLOPs - while being 20% cheaper. Which would be more impressive if the 3090 Ti hadn't been priced at $2000.

    The 4080 will arrive in November in two models, with 12GB of RAM and 40 TFLOPs at $900, and 16GB of RAM and 48 TFLOPs at $1200. That's a significant difference; either the 16GB model should be called the 4080 Ti or the 12GB model should be the 4070 Ti.

    While the base 4080 has the same compute power as the 3090 Ti at less than half the price, it also has half the memory and half the memory bandwidth. Nvidia is making up for that by increasing the on-chip cache from 6MB to 48MB (and 96MB on the 4090).

    AMD did that with the Radeon RX 6000 range, and it worked pretty well. The options for doubling bandwidth over the 3090 Ti are pretty much restricted to HBM, which isn't exactly cheap. On the other hand, moving from Samsung's 8nm process to TSMC's 4nm meant Nvidia had a huge number of transistors to play with - up from 28 billion on the 3090 Ti to 76 billion on the 4090 - so using five billion or so on cache was not a hard call to make.

    While $900 for the smaller RTX 4080 looks good compared to the $2000 3090 Ti, it doesn't look nearly so good when compared with the $700 RTX 3080, and gamers don't seem to be happy. It's about 30% more expensive and offers about 30% more performance.

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