Monday, March 20th 2023
AMD Ryzen 7 7840U Low-Power Processor Beats Previous-Gen Flagship Ryzen 9 6900HX
AMD's 4 nm "Phoenix" silicon could serious turn the company's fortunes around in the ultra-thin notebook space. The 28-Watt Ryzen 7 7840U surfaced on Cinebench R23 screenshots, where it is shown beating the previous-generation 55 W flagship, the Ryzen 9 6900HX. If this is any indication of performance across the board, then the 15-28 W models of Ryzen 7040-series "Phoenix" could unleash an open-season against competing 15-28 W-category 13th Gen Core processors that have lower P-core counts, such as 2P+8E. The 7840U has all eight "Zen 4" CPU cores enabled, along with a fast RDNA3 graphics architecture based iGPU. In the screenshot, the 7840U is shown with a Cinebench R23 multi-threaded score of 14285 points, a score that is higher than that of the "Zen 3+" based 6900HX "Rembrandt," and a touch below the 45 W Core i7-12800H, which means it could have the upper hand over several 13th Gen and 12 Gen SKUs in the 15-28 W category.
Sources:
Wccftech, VideoCardz
23 Comments on AMD Ryzen 7 7840U Low-Power Processor Beats Previous-Gen Flagship Ryzen 9 6900HX
2. The 7700X achieve this performance somewhere in the 40-50W range
combining above two, the PL1=40W setting is the most likely.
Intel will introduce new iGPU and its upper tier will be almost the same to A370M which has 112 GB/s memory bandwidth. The score of A370M is around 3.6k, so the memory bottleneck likely limits the performance around 3k. Finally, both AMD and Intel's iGPU will perform similar by this bottleneck.
Hmm, I see IF between CPU and iGPU but for what AMD not using direct connection and whether this usage affects the same way as the connection to the i/o chiplet. Does memory controller ratio matter? I don't think that's the usage in this case?
[URL='https://www.techpowerup.com/review/amd-ryzen-7-5700g/'][B][SIZE=4]AMD Ryzen 7 5700G Review[/SIZE][/B][/URL]
On-Die communications is faster than Die-to-Die communications, which is faster than socket-to-socket communications. But all three communications will be called "Infinity Fabric" at the marketing level... possibly the Engineering level (if there are shared concepts between them).
For an example of how Infinity Fabric worked in Zen1, see here: en.wikichip.org/wiki/amd/infinity_fabric#Scalable_Control_Fabric_.28SCF.29
en.wikichip.org/w/images/a/a6/amd_zeppelin_basic_block_4-dies.svg
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EDIT: Raven Ridge's infinity fabric was apparently like this:
"SDF" is the on-die Data plane, or a more detailed part of Infinity Fabric. (Citation: fuse.wikichip.org/news/1596/hot-chips-30-amd-raven-ridge/3/)
UMC being the memory / DDR4 controllers, CCX being the CPU cores. So UMC was connected to the same internal SDF switch as CPU, meaning CPU is going to access DDR4 a bit faster than the GPU. At least for Raven Ridge.
If AMD wanted to have a real usable APU they could probably do it. The bandwidth could still be an issue, (even the 6500XT have over 140 GB/s of bandwidth with its 64 bit bus) but with a smaller process node, same size or slightly more infinity cache, it could probably still make those cards obsolete and provide some decent gaming performance. Just something near or slightly above the Xbox series S GPU and that would be great.