AMD EPYC 9734 socket: SP5
The AMD EPYC 9734 uses SP5, the 6096-contact LGA socket for EPYC 9004 server processors. The 112-core chip at 340 W with 256 MB of L3 needs an SP5 board with DDR5 ECC memory.
AMD EPYC 9734 specifications
| Cores | 112 |
|---|---|
| Threads | 224 |
| Core architecture | Zen 4c (Bergamo) |
| Clocks | 2.2 GHz base, up to 3.0 GHz boost |
| Cache | 112 MB L2 plus 256 MB L3 |
| Default TDP | 340 W |
| Manufacturing process | TSMC 5 nm CCD with 6 nm IOD |
| Memory support | DDR5-4800 ECC, 12 channels, up to 6 TB per socket |
| PCI Express | 128 PCIe Gen5 lanes per socket, up to 160 in 2P |
| Integrated graphics | None (BMC graphics on board) |
| Multiplier | Locked |
| ECC memory | Supported, DDR5 ECC RDIMM |
| Package | SP5 LGA6096 |
| Cooler in the box | None, server heatsink required |
Motherboard compatibility
AMD EPYC 9734 needs a motherboard with a SP5 socket. Chipset by chipset data for this codename is not recorded yet. See the SP5 chipset list and the board maker's CPU support list.
SP5 at a glance
| Type | LGA, 6,096 contacts |
|---|---|
| Package size | 72 × 75.4 mm |
| Introduced | November 2022 |
| Memory | DDR5 ECC RDIMM, 12 channels (up to DDR5-6000, DDR5-6400 in target configs, up to 6 TB per socket) |
| Cooler mounting holes | Board specific (server heatsink) |
What the EPYC 9734 is
The EPYC 9734 is the 112-core Bergamo option for SP5 servers in June 2023 with two cores per CCD disabled. One hundred twelve Zen 4c small cores with multithreading run at 2.2 GHz base and up to 3.0 GHz boost, backed by 112 MB of L2 and 256 MB of L3. The package keeps the full 16 MB of L3 per CCX and 256 MB total like the 128-core twin on TSMC 5 nm. Default power is 340 W per the AMD data sheet for single and dual socket use.
Slightly fewer cores with lower power suit scale-out fleets that balance density against thermals. One hundred twelve cores still pack hundreds of vCPUs per socket while trimming 20 W against the 128-core flagship. Twelve DDR5-4800 ECC channels feed 6 TB per socket, while 128 Gen5 lanes per socket feed fabric and NVMe. The mix often fits racks with strict per-node power caps.
Buyers compare the 9734 against the 9754 where maximum threads matter and against Genoa where cache matters. Bergamo wins vCPU density per watt, while Genoa wins per-core speed. Boards that run Genoa accept Bergamo with a BIOS update on the same SP5 socket. The Socket vs chipset: what decides whether a CPU works guide is secondary to board firmware lists.
Socket and motherboard compatibility
The 9734 fits SP5 on single or dual socket server boards with LGA 6096 frames. Board lists must name Bergamo 97x4 for Zen 4c support. Power delivery for 340 W continuous suits dense racks with metered power.
SP5 boards wire 12 DDR5 channels per socket with two DIMMs per channel for full capacity. BMC firmware covers fleet updates. Confirm heatsink class for 112-core thermals before consolidating scale-out tiers.
Memory, PCIe and cooling
DDR5-4800 ECC RDIMM in 12 channels per socket to 6 TB feeds 112 small cores for dense guests. Interleaving tunes throughput. ECC stays enabled for fleet uptime. Validated kits at rated speed are required.
PCIe Gen5 gives 128 lanes per socket and up to 160 in dual socket for fabric and NVMe. Scale-out nodes wire high-radix networking with fast scratch. Cooling needs SP5 server sinks for 340 W with front-to-back flow.
Upgrade paths
On SP5 the upward move is the 128-core 9754 where threads scale, without changing boards where power allows. Memory growth to 12 channels and fabric upgrades often help more than cores. The 112-core point already holds full L3, so cache-sensitive work loses little against the flagship.
Outside Bergamo, Genoa adds clocks and cache on SP5, while Genoa-X adds stacked cache for HPC. Most 9734 owners optimise power caps first, since 340 W already nears rack limits.
Frequently asked questions
What socket does the EPYC 9734 use?
SP5 (LGA 6096) on single or dual socket server boards with Bergamo BIOS support.
How many cores does the 9734 have?
112 cores and 224 threads at 2.2 GHz base and up to 3.0 GHz boost, with 112 MB L2 and 256 MB L3 and a 340 W TDP.
Why does the 9734 have 112 cores?
Two cores per CCD are disabled against the 128-core 9754, keeping full 256 MB L3 while trimming power to 340 W.
What memory does the 9734 need?
DDR5-4800 ECC RDIMM in 12 channels per socket to 6 TB.
Sources and verification
Facts last checked against these sources on . Page last edited on .