Computex 2022: AMD Ryzen 7000 Processors Offer Faster CPU Cores, RDNA 2 Graphics

Computex 2022: AMD Ryzen 7000 Processors Offer Faster CPU Cores, RDNA 2 Graphics

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Single Thread Performance Uplift Examined

While some have taken the “greater than 15% uplift in single-thread performance” as an indication of Zen 4 IPC improvements, there are a number of factors at play here. AMD does not make any such IPC (instructions per clock) claim, as the uplift is a combination of the architectural improvements (including double the L2 cache per core), increased clock speeds, and the move to higher-bandwidth DDR5 memory.

Let’s look at the relevant footnote from AMD’s press release, explaining under what conditions the new Zen 4 sample was compared to a Ryzen 9 5950X:

“Testing as of May 5, 2022, by AMD Performance Labs. Single-thread performance evaluated with Cinebench R23 1T. AMD Ryzen 9 5950X System: ASUS ROG Crosshair VIII Hero X570, 2×8 DDR4-3600C16. AMD Ryzen 7000 Series: AMD Reference X670 Motherboard, 16-core Ryzen 7000 Series pre-production processor sample, 2x16GB DDR5-6000CL30. All systems configured with Radeon RX 6950XT GPU (driver: 22.10 Prime), Windows 11 Build 22000.593, Samsung 980 Pro 1TB SSD, Asetek 280MM liquid cooler. Results may vary when final products are released in market.”

The 16-core Ryzen 7000 pre-production processor sample was paired with 32GB (2 x 16GB) of DDR5 at 6000 MT/s, CL30. The Ryzen 9 5950X it was compared to had just 16GB (2 x 8GB) of DDR4 at 3600 MT/s, CL16. Why they didn’t use 32 GB with the Ryzen 9 5950X is unknown, though in a single-threaded workload like Cinebench R23 I doubt it made any difference. It still looks a little odd, particularly as AMD used such low latency DDR5 with the Zen 4 system (yes, CL30 at 6000 MT/s is actually very low for DDR5), and CL16 DDR4, rather than CL14, in the Zen 3 system. Sure, the difference would probably be negligible in this test, but I’m sure AMD has access to 32GB of the lower-latency DDR4.

One more thing: I am not seeing 3D V-Cache mentioned anywhere, and AMD did not test the new 16-core Ryzen 7000 pre-production processor sample’s single-thread performance against their recent Ryzen 7 5800X3D – instead focusing on a comparison to the Ryzen 9 5950X. Now, at 5.5 GHz (and with DDR5-6000 CL30) the new CPU was going to win, regardless.

AMD at Computex 2022 Replay

You can peruse AMD’s announcements on their Computex page (linked here), and view the YouTube video of AMD’s full event (embedded below):

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