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[Bofferbrauer2]

Pemalite said:

Bofferbrauer2 said:

I'll have to wait until April earliest anyway, so by then the stock issues will probably have eased up a bit again. Besides, I'm interested what the mid-range chips will look like (Ryzen 5 and Navi 22/23)

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Speaking of the future, a Ryzen 7 5800U has been benchmarked in Cinebench R20 and R23.

In R20 singlethreaded, the chip reaches the same result as the Intel i9 10900K despite having a max turbo of only 4.4 Ghz, and was about 6% above the 4800U. In multithreaded, it reached 3650 points, which is about the same level as the old 8-core threadripper 1900X and somewhat above the likes of a Ryzen 5 3600 and Ryzen 7 2700 and 13% above it's predecessor.

The R23 results however a more mixed. Singlethreaded, the chip beat it's predecessor by 5%, but in multithreaded, the 4800U was quite a bit faster. It's probable that the cores were not all used in the latter test due to some bug.

All in all, while the results in R20 are pretty good, it's a bit of a downer compared to what the desktop variant managed to achieve.

Yeah saw those details.

At this point I am not actually worried about CPU performance or battery life in a notebook... It's integrated graphics that really needs to step it up a notch... Which is where AMD needs to start investing in RDNA2 which brings with it a plethora of efficiency gains which will benefit the low bandwidth of such devices.

I mean, I have a Ryzen 4500u and 2700u notebook and the 4500u is more than double the CPU speed, but only 50% better at graphics.

The question will be if infinity cache will be implemented into APUs. After all, the size of the cache should cause a pretty big increase in size for such small chips, and a smaller one would probably not bring very much benefit anymore. And without the infinity cache or some bolted-on fast memory chips as LLC, they are really limited by the RAM bandwidth.

Zen 4 next year should solve (well, alleviate) this problem, as it comes with DDR5, and probably also will bring some RDNA variant, which as far as I know needs a bit less bandwidth than GCN even without infinity cache already.

I expect the Infinity cache in the Zen 4 APUs to be half or a third of the size of the one in Big Navi (32 or 24 Megabyte). Less would probably not bring much benefit anymore, while more would make then too expensive for the performance gains.

My prediction for the Zen 4 APUs: 12 slightly altered RDNA2 CU with 2.1Ghz clock speed (not more CU because it will probably only support lower speed DDR5 early on, like DDR5-4800 for instance) in the 6800H and 1.8 Ghz in the 6800U; should be enough to beat Baffin (RX 560), Zen 5 (or whatever will follow after Zen 4) should increase the CU count to 14 or 16.

Last edited by Bofferbrauer2 - on 09 January 2021