SMC EPYC 9555P 64-core AMD Socket SP5

The EPYC 9555P posts a PassMark multi-thread score of 135,217, the best in our entire database. It's a 64-core, 128-thread Turin chip with 256MB of L3 cache and AI performance in the 99th percentile. The catch is a 360W TDP and an efficiency score of just 42.1, so bring a big cooler and a bigger power bill.

The multi-thread PassMark of 135,217 is the headline number. For context, that's the kind of score that makes high-end desktop chips look like they're running in slow motion. The 64 cores and 128 threads are backed by 256MB of L3 cache and 64MB of L2, which keeps data close to the compute units. DDR5 with ECC support means you can run long jobs without worrying about silent memory corruption taking down your results. PCIe 5.0 and CXL 2.0 support open the door to memory expansion and fast storage, which matters if you're building a box for serious AI inference.

The 4.4GHz boost clock is solid for a 64-core part, and the single-thread score of 3,756 reflects that. It's not going to beat a Ryzen 7 9800X3D in lightly threaded tasks, but that's not the point. The AI score in the 99th percentile tells you where this chip earns its keep. AMD tuned these high-frequency Turin parts specifically for CPU-based AI inference, and the numbers back that up. The platform score also lands in the 97th percentile, which reflects the SP5 socket's expandability and the sheer amount of I/O you get.

Against the Ryzen 7 9800X3D, the EPYC 9555P wins the multi-thread battle by a landslide, but the 9800X3D will crush it in gaming and lightly threaded tasks thanks to its 3D V-Cache. The Intel Core Ultra 9 285K is a more interesting comparison for mixed workloads, but it still can't touch 64 Zen 5 cores in heavily parallel jobs. The D&H Core i9 BX80673I99940X is an older HEDT part that gets left behind in both core count and platform features. The Dell Inspiron 7700 and fosa1 fosa4ycn78izud aren't even in the same conversation, they're consumer systems competing in a different weight class. If you need maximum multi-threaded throughput and AI inference on CPU, the EPYC 9555P is the clear pick. If you need a balanced desktop chip, look elsewhere.

We don't have a US price for this chip, but the one listing we found sits at CAD 16,370. That's a serious chunk of change, and it puts the EPYC 9555P firmly in workstation and server territory. When you divide that price by the multi-thread PassMark score, you're paying for the absolute top of the performance charts. The efficiency score of 42.1 means you'll also be paying for electricity every month, and a 400W turbo draw requires real cooling. If you need this level of parallel throughput, the price per core is actually reasonable for what you get. If you don't, it's a very expensive space heater.

The SMC EPYC 9555P posts a PassMark multi-thread score of 135,217. That puts it in the 100th percentile of every processor in our database, which is a polite way of saying nothing else comes close. You're looking at 64 cores, 128 threads, a 4.4GHz boost clock, and 256MB of L3 cache on AMD's 4nm Turin architecture. This is a server chip wearing a desktop name tag, and it behaves like one.

Single-thread performance lands at 3,756 on PassMark, good for the 89th percentile. That's not chart-topping, but it's respectable for a part designed to chew through parallel workloads. The real story is the AI score, which sits in the 99th percentile. If you're running CPU-based inference or memory-hungry machine learning jobs, this thing is built for exactly that. The efficiency score of 42.1 out of 100 is the trade-off. A 360W TDP that spikes to 400W under turbo means your power bill becomes a line item in your project budget.

Skip the EPYC 9555P if you're building a gaming PC or a general-purpose desktop. The single-thread score of 3,756 is decent but not exceptional, and you'd be paying for 64 cores you'll never fully utilize. The efficiency score of 42.1 is a red flag for anyone running a home server or a small office setup where power costs matter. At CAD 16,370, this chip only makes sense if your workload genuinely scales across dozens of cores or you're doing CPU-based AI inference. If you're just browsing, gaming, or doing light productivity work, a Ryzen 7 9800X3D or Core Ultra 9 285K will serve you better for a fraction of the price and power draw.

The SMC EPYC 9555P is a monster for parallel workloads, and the PassMark multi-thread score of 135,217 proves it. The 99th percentile AI performance makes it a legitimate option for CPU-based inference, and the platform features like CXL 2.0 and PCIe 5.0 give it room to grow. But the efficiency score of 42.1 is a real problem. A 360W TDP that spikes to 400W means you need serious cooling and a power supply that can handle the load. If your workload scales across 64 cores and you can stomach the power draw, this is one of the best server chips you can buy right now. If you're building a gaming rig or a general-purpose desktop, you're wasting your money.