AMD Adds Further Zen 4 CPU Support In Linux Patches, Enables RDDR5 & LRDDR5 For EPYC CPU With Up To 12-Channels

AMD is rolling out the first enablement patches of their next-generation EPYC Zen 4 CPUs and the new features incorporated within them for the Linux OS.

AMD Zen 4 Enablement Patches Rolling Out To Linux, Bring RDDR5 & LRDDR5 Memory Support

While AMD still isn't finished with Zen 3 on both client and server platforms, AMD's Linux team is already rolling out the initial patches for Zen 4 support in the Linux OS. As reported by Phoronix, the latest patches include support for AMD's next-generation EPYC server chips that will offer 12-channel memory support.

AMD already rolled out patches that enabled support for AMD EPYC CPUs with up to 12 CCDs so this means that Linux currently has both Genoa and Bergamo added to the list. There's also new temperature monitoring support for Zen 4 CPUs & the latest patch further expands on the memory front.

The new patch brings support for up to 12-channel memory in both RDDR5 and LDDR5 flavors. The RDDR5 (Registered DDR5) & LRDDR5 (Load-Reduced DDR5) memory will both be supported by the AMD EPYC Zen 4 platforms with LRDDR5 aimed at dense memory servers. Each CPU will feature up to 12 memory controllers (per socket) which is an upgrade from the existing 8 controllers per chip. It is also reported that AMD's Zen 4 chips will be branded under the 'Family 19h Models 10h-1Fh and A0h-AFh'.

The EPYC Genoa chip renders revealed a total of 12 CCD's (16 cores per CCD) to reach 96 cores while the AMD Bergamo renders also show 12 CCDs but it is likely that either Zen 4C houses more cores per CCD or the render shown wasn't final as a 16 core CCD configuration would mean a total of 16 Zen 4 CCDs to hit 128 cores. The final die arrangement is definitely going to be an interesting sight. You can check out more information on both next-gen AMD EPYC CPU families that are launching with Zen 4 & Zen 4C cores in 2022 & 2023, respectively, here.

AMD EPYC CPU Families:

Family Name	AMD EPYC Verano	AMD EPYC Venice	AMD EPYC Turin-X	AMD EPYC Turin-Dense	AMD EPYC Turin	AMD EPYC Siena	AMD EPYC Bergamo	AMD EPYC Genoa-X	AMD EPYC Genoa	AMD EPYC Milan-X	AMD EPYC Milan	AMD EPYC Rome	AMD EPYC Naples
Family Branding	EPYC 9007	EPYC 9006	EPYC 9005	EPYC 9005	EPYC 9005	EPYC 8004	EPYC 9004	EPYC 9004	EPYC 9004	EPYC 7004	EPYC 7003	EPYC 7002	EPYC 7001
Family Launch	2027	2026	2025	2025	2024	2023	2023	2023	2022	2022	2021	2019	2017
CPU Architecture	Zen 7	Zen 6	Zen 5	Zen 5C	Zen 5	Zen 4	Zen 4C	Zen 4 V-Cache	Zen 4	Zen 3	Zen 3	Zen 2	Zen 1
Process Node	TBD	2nm TSMC	4nm TSMC	3nm TSMC	4nm TSMC	5nm TSMC	4nm TSMC	5nm TSMC	5nm TSMC	7nm TSMC	7nm TSMC	7nm TSMC	14nm GloFo
Platform Name	SP7	SP7	SP5	SP5	SP5	SP6	SP5	SP5	SP5	SP3	SP3	SP3	SP3
Socket	TBD	TBD	LGA 6096 (SP5)	LGA 6096 (SP5)	LGA 6096	LGA 4844	LGA 6096	LGA 6096	LGA 6096	LGA 4094	LGA 4094	LGA 4094	LGA 4094
Max Core Count	TBD	96	128	192	128	64	128	96	96	64	64	64	32
Max Thread Count	TBD	192	256	384	256	128	256	192	192	128	128	128	64
Max L3 Cache	TBD	TBD	1536 MB	384 MB	384 MB	256 MB	256 MB	1152 MB	384 MB	768 MB	256 MB	256 MB	64 MB
Chiplet Design	TBD	8 CCD's (1 CCX per CCD) + 2 IOD?	16 CCD's (1CCX per CCD) + 1 IOD	12 CCD's (1CCX per CCD) + 1 IOD	16 CCD's (1CCX per CCD) + 1 IOD	8 CCD's (1CCX per CCD) + 1 IOD	12 CCD's (1 CCX per CCD) + 1 IOD	12 CCD's (1 CCX per CCD) + 1 IOD	12 CCD's (1 CCX per CCD) + 1 IOD	8 CCD's (1 CCX per CCD) + 1 IOD	8 CCD's (1 CCX per CCD) + 1 IOD	8 CCD's (2 CCX's per CCD) + 1 IOD	4 CCD's (2 CCX's per CCD)
Memory Support	TBD	DDR5-12800	DDR5-6000?	DDR5-6400	DDR5-6400	DDR5-5200	DDR5-5600	DDR5-4800	DDR5-4800	DDR4-3200	DDR4-3200	DDR4-3200	DDR4-2666
Memory Channels	TBD	16-Channel (SP7)	12 Channel (SP5)	12 Channel	12 Channel	6-Channel	12 Channel	12 Channel	12 Channel	8 Channel	8 Channel	8 Channel	8 Channel
PCIe Gen Support	TBD	128-192 PCIe Gen 6	TBD	128 PCIe Gen 5	128 PCIe Gen 5	96 Gen 5	128 Gen 5	128 Gen 5	128 Gen 5	128 Gen 4	128 Gen 4	128 Gen 4	64 Gen 3
TDP (Max)	TBD	~600W	500W (cTDP 600W)	500W (cTDP 450-500W)	400W (cDP 320-400W)	70-225W	320W (cTDP 400W)	400W	400W	280W	280W	280W	200W

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