EPYC 9455P vs EPYC 9555

PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.

Head-to-Head Verdict, Benchmarks, Value & Long-Term Outlook

This comparison brings together gaming FPS, productivity performance, platform differences, power efficiency, pricing context, and upgrade path so you can see which CPU actually makes more sense.

EPYC 9455P

2024

Why buy it

✅Costs $5,007 less on MSRP ($4,819 MSRP vs $9,826 MSRP).
✅Delivers 78.9% more PassMark for each dollar spent, at 24.3 vs 13.6 PassMark/$ ($4,819 MSRP vs $9,826 MSRP).
✅Draws 300W instead of 360W, a 60W reduction.

Trade-offs

❌Lower PassMark (116,926 vs 133,253).

EPYC 9555

2024

Why buy it

✅+14% higher PassMark.

Trade-offs

❌Lower PassMark per dollar, at 13.6 vs 24.3 PassMark/$ ($9,826 MSRP vs $4,819 MSRP).
❌20% higher power demand at 360W vs 300W.

EPYC 9455P

2024

EPYC 9555

2024

Why buy it

✅Costs $5,007 less on MSRP ($4,819 MSRP vs $9,826 MSRP).
✅Delivers 78.9% more PassMark for each dollar spent, at 24.3 vs 13.6 PassMark/$ ($4,819 MSRP vs $9,826 MSRP).
✅Draws 300W instead of 360W, a 60W reduction.

Why buy it

✅+14% higher PassMark.

Trade-offs

❌Lower PassMark (116,926 vs 133,253).

Trade-offs

❌Lower PassMark per dollar, at 13.6 vs 24.3 PassMark/$ ($9,826 MSRP vs $4,819 MSRP).
❌20% higher power demand at 360W vs 300W.

Quick Answers

So, is EPYC 9555 better than EPYC 9455P?

Yes. EPYC 9555 is the better overall CPU here. You are getting a 0.7% average FPS lead across 50 shared CPU game tests in our data, 14% better PassMark, and the stronger long-term platform, which makes it the stronger all-around choice.

Which one is better for gaming?

For gaming, the two CPUs are effectively a wash in the available data.

Which one is better for streaming, content creation, and heavy multitasking?

For streaming, content creation, and heavier multitasking, EPYC 9555 is the better fit. You are getting 14% better PassMark, backed by 64 cores and 128 threads.

Which one is the smarter buy today, not just the cheaper CPU?

EPYC 9555 is still the faster CPU overall, but EPYC 9455P makes more sense if price matters more than absolute performance. EPYC 9555 is 103.9% more expensive on MSRP at $9,826 MSRP versus $4,819 MSRP, and it gives you a 0.7% average FPS lead across 50 shared CPU game tests in our data. EPYC 9455P is also 78.9% better value on MSRP (24.3 vs 13.6 PassMark/$), which is why it is easier to justify for price-conscious builds on paper.

Which one is more future-proof for 2026 and beyond?

EPYC 9555 is the more future-proof choice for 2026 and beyond. You are getting more multi-core headroom with 64 cores / 128 threads instead of 48/96. That extra cache should hold up really well in CPU-limited games and high-refresh builds.

Games Benchmarks

Paired with RTX 4090

To accurately isolate CPU performance, all benchmarks below use an NVIDIA RTX 4090 as the reference GPU. This eliminates GPU-side bottlenecks and highlights pure processing throughput differences between the CPUs.

Note: Real-world results may vary based on your actual GPU. CPU performance impact is more visible in processing-intensive titles and high-refresh-rate gaming scenarios.

EPYC 9455P Benchmark Check

EPYC 9555 Benchmark Check

Path of Exile 2

Preset	EPYC 9455P	EPYC 9555
1080p
low	171 FPS	171 FPS
medium	142 FPS	142 FPS
high	122 FPS	122 FPS
ultra	99 FPS	99 FPS
1440p
low	150 FPS	150 FPS
medium	121 FPS	121 FPS
high	99 FPS	99 FPS
ultra	83 FPS	83 FPS
4K
low	84 FPS	84 FPS
medium	73 FPS	73 FPS
high	57 FPS	57 FPS
ultra	47 FPS	47 FPS

Open EPYC 9455P Open EPYC 9555

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	EPYC 9455P	EPYC 9555
1080p
low	655 FPS	655 FPS
medium	566 FPS	566 FPS
high	459 FPS	459 FPS
ultra	397 FPS	397 FPS
1440p
low	546 FPS	546 FPS
medium	483 FPS	483 FPS
high	404 FPS	404 FPS
ultra	328 FPS	328 FPS
4K
low	331 FPS	331 FPS
medium	295 FPS	295 FPS
high	268 FPS	268 FPS
ultra	236 FPS	236 FPS

Open EPYC 9455P Open EPYC 9555

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	EPYC 9455P	EPYC 9555
1080p
low	747 FPS	747 FPS
medium	634 FPS	634 FPS
high	590 FPS	590 FPS
ultra	519 FPS	519 FPS
1440p
low	561 FPS	561 FPS
medium	474 FPS	474 FPS
high	434 FPS	434 FPS
ultra	376 FPS	376 FPS
4K
low	405 FPS	405 FPS
medium	326 FPS	326 FPS
high	288 FPS	288 FPS
ultra	229 FPS	229 FPS

Open EPYC 9455P Open EPYC 9555

League of Legends

League of Legends

Valorant

Preset	EPYC 9455P	EPYC 9555
1080p
low	993 FPS	1005 FPS
medium	892 FPS	902 FPS
high	767 FPS	778 FPS
ultra	692 FPS	702 FPS
1440p
low	799 FPS	809 FPS
medium	696 FPS	704 FPS
high	594 FPS	603 FPS
ultra	525 FPS	533 FPS
4K
low	567 FPS	574 FPS
medium	503 FPS	510 FPS
high	441 FPS	447 FPS
ultra	387 FPS	392 FPS

Open EPYC 9455P Open EPYC 9555

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of EPYC 9455P and EPYC 9555

EPYC 9455P

The EPYC 9455P is manufactured by AMD. It was released in 10 October 2024 (1 year ago). It is based on the Turin (2024) architecture. It features 48 cores and 96 threads. Base frequency is 3.15 GHz, with boost up to 4.4 GHz. L3 cache: 256 MB (total). L2 cache: 1 MB (per core). Built on 4 nm process technology. Socket: SP5. Thermal design power (TDP): 300 Watt. Memory support: DDR5. Passmark benchmark score: 116,926 points. Launch price was $4,819.

EPYC 9555

The EPYC 9555 is manufactured by AMD. It was released in 10 October 2024 (1 year ago). It is based on the Turin (2024) architecture. It features 64 cores and 128 threads. Base frequency is 3.2 GHz, with boost up to 4.4 GHz. L3 cache: 256 MB (total). L2 cache: 1 MB (per core). Built on 4 nm process technology. Socket: SP5. Thermal design power (TDP): 360 Watt. Memory support: DDR5. Passmark benchmark score: 133,253 points. Launch price was $9,826.

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Processing Power

The EPYC 9455P packs 48 cores / 96 threads, while the EPYC 9555 offers 64 cores / 128 threads — the EPYC 9555 has 16 more cores. Boost clocks reach 4.4 GHz on the EPYC 9455P versus 4.4 GHz on the EPYC 9555 — identical boost frequencies (base: 3.15 GHz vs 3.2 GHz). Both are built on the Turin (2024) architecture using a 4 nm process. In PassMark, the EPYC 9455P scores 116,926 against the EPYC 9555's 133,253 — a 13.1% lead for the EPYC 9555. Both processors carry 256 MB (total) of L3 cache.

Feature	EPYC 9455P	EPYC 9555
Cores / Threads	48 / 96	64 / 128+33%
Boost Clock	4.4 GHz	4.4 GHz
Base Clock	3.15 GHz	3.2 GHz+2%
L3 Cache	256 MB (total)	256 MB (total)
L2 Cache	1 MB (per core)	1 MB (per core)
Process	4 nm	4 nm
Architecture	Turin (2024)	Turin (2024)
PassMark	116,926	133,253+14%
Geekbench 6 Single	1,962	—
Geekbench 6 Multi	1,898	—

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Memory & Platform

Both processors use the SP5 socket with PCIe 5.0. Both support up to DDR5-6000 memory speed. The EPYC 9455P supports up to 9 TB of RAM compared to 6 TB — 40% more capacity for professional workloads. Both feature 12-channel memory with ECC support. Both provide 128 PCIe lanes. Chipset compatibility: SP5 (EPYC 9455P) and SP5 (EPYC 9555).

Feature	EPYC 9455P	EPYC 9555
Socket	SP5	SP5
PCIe Generation	PCIe 5.0	PCIe 5.0
Max RAM Speed	DDR5-6000	DDR5-6000
Max RAM Capacity	9 TB+50%	6 TB
RAM Channels	12	12
ECC Support	Yes	Yes
PCIe Lanes	128	128

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Advanced Features

Both support AMD-V, SEV-SNP virtualization. Primary use case: EPYC 9455P targets Data Center / Single Socket, EPYC 9555 targets Data Center. Direct competitor: EPYC 9455P rivals Xeon 6766E; EPYC 9555 rivals Xeon 6972P.

Feature	EPYC 9455P	EPYC 9555
Integrated GPU	No	No
Virtualization	AMD-V, SEV-SNP	AMD-V, SEV-SNP
Target Use	Data Center / Single Socket	Data Center

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Value Analysis

The EPYC 9455P launched at $4819 MSRP, while the EPYC 9555 debuted at $9826. On MSRP ($4819 vs $9826), the EPYC 9455P is $5007 cheaper. In terms of value on MSRP (PassMark points per dollar), the EPYC 9455P delivers 24.3 pts/$ vs 13.6 pts/$ for the EPYC 9555 — making the EPYC 9455P the 56.6% better value option.