EPYC 4545P vs Ryzen 9 9955HX

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 4545P

2025

Why buy it

Trade-offs

❌Lower PassMark (54,255 vs 55,711).
❌Launch MSRP is still $549 MSRP, while Ryzen 9 9955HX mostly shows up through inconsistent older-market listings.
❌18.2% higher power demand at 65W vs 55W.

Ryzen 9 9955HX

2025

Why buy it

✅+2.7% higher PassMark.
✅Draws 55W instead of 65W, a 10W reduction.

Trade-offs

❌Fewer obvious downsides in this matchup outside of normal market pricing swings.

EPYC 4545P

2025

Ryzen 9 9955HX

2025

Why buy it

✅+2.7% higher PassMark.
✅Draws 55W instead of 65W, a 10W reduction.

Trade-offs

❌Lower PassMark (54,255 vs 55,711).
❌Launch MSRP is still $549 MSRP, while Ryzen 9 9955HX mostly shows up through inconsistent older-market listings.
❌18.2% higher power demand at 65W vs 55W.

Trade-offs

❌Fewer obvious downsides in this matchup outside of normal market pricing swings.

Quick Answers

So, is Ryzen 9 9955HX better than EPYC 4545P?

Not in a simple one-size-fits-all way. EPYC 4545P makes more sense for workstation-style multi-core throughput, while Ryzen 9 9955HX is the better mainstream desktop choice for gaming, platform cost, and day-to-day practicality.

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, Ryzen 9 9955HX is the better fit. You are getting 2.7% better PassMark, backed by 16 cores and 32 threads.

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

Ryzen 9 9955HX is still the faster CPU overall, but EPYC 4545P makes more sense if price matters more than absolute performance. Ryzen 9 9955HX is at an unclear MSRP at unclear MSRP versus $549 MSRP, and it gives you a 0.4% average FPS lead across 4 shared CPU game tests in our data. EPYC 4545P is also 100.0% better value on MSRP (98.8 vs 0.0 PassMark/$), which is why it is easier to justify for price-conscious builds on paper.

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

Ryzen 9 9955HX is the more future-proof choice for 2026 and beyond. You are getting more multi-core headroom with 16 cores / 32 threads instead of 16/32. That extra compute headroom should age better as games, background tasks, and creator workloads get heavier.

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 4545P Benchmark Check

Ryzen 9 9955HX Benchmark Check

Path of Exile 2

Preset	EPYC 4545P	Ryzen 9 9955HX
1080p
low	286 FPS	284 FPS
medium	262 FPS	261 FPS
high	215 FPS	214 FPS
ultra	181 FPS	180 FPS
1440p
low	262 FPS	260 FPS
medium	218 FPS	217 FPS
high	167 FPS	167 FPS
ultra	148 FPS	147 FPS
4K
low	182 FPS	181 FPS
medium	151 FPS	151 FPS
high	115 FPS	115 FPS
ultra	102 FPS	102 FPS

Open EPYC 4545P Open Ryzen 9 9955HX

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	EPYC 4545P	Ryzen 9 9955HX
1080p
low	674 FPS	666 FPS
medium	580 FPS	577 FPS
high	434 FPS	433 FPS
ultra	375 FPS	369 FPS
1440p
low	567 FPS	564 FPS
medium	506 FPS	503 FPS
high	392 FPS	389 FPS
ultra	312 FPS	305 FPS
4K
low	320 FPS	318 FPS
medium	289 FPS	288 FPS
high	255 FPS	253 FPS
ultra	219 FPS	214 FPS

Open EPYC 4545P Open Ryzen 9 9955HX

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	EPYC 4545P	Ryzen 9 9955HX
1080p
low	850 FPS	848 FPS
medium	679 FPS	678 FPS
high	601 FPS	600 FPS
ultra	515 FPS	515 FPS
1440p
low	679 FPS	678 FPS
medium	543 FPS	542 FPS
high	469 FPS	469 FPS
ultra	398 FPS	397 FPS
4K
low	484 FPS	482 FPS
medium	401 FPS	399 FPS
high	360 FPS	359 FPS
ultra	302 FPS	301 FPS

Open EPYC 4545P Open Ryzen 9 9955HX

League of Legends

League of Legends

Valorant

Preset	EPYC 4545P	Ryzen 9 9955HX
1080p
low	1072 FPS	1071 FPS
medium	966 FPS	966 FPS
high	843 FPS	843 FPS
ultra	760 FPS	759 FPS
1440p
low	842 FPS	840 FPS
medium	747 FPS	746 FPS
high	652 FPS	651 FPS
ultra	566 FPS	564 FPS
4K
low	619 FPS	618 FPS
medium	553 FPS	553 FPS
high	487 FPS	487 FPS
ultra	421 FPS	420 FPS

Open EPYC 4545P Open Ryzen 9 9955HX

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of EPYC 4545P and Ryzen 9 9955HX

EPYC 4545P

The EPYC 4545P is manufactured by AMD. It was released in 13 May 2025 (less than a year ago). It is based on the Grado (2025) architecture. It features 16 cores and 32 threads. Base frequency is 3 GHz, with boost up to 5.4 GHz. L3 cache: 64 MB (total). L2 cache: 1 MB (per core). Built on 4 nm process technology. Socket: AM5. Thermal design power (TDP): 65 Watt. Memory support: DDR5. Passmark benchmark score: 54,255 points. Launch price was $549.

Ryzen 9 9955HX

The Ryzen 9 9955HX is manufactured by AMD. It was released in 2025-01-01. It is based on the Fire Range-HX (Zen 5) (2025) architecture. It features 16 cores and 32 threads. Base frequency is 2.5 GHz, with boost up to 5.4 GHz. L3 cache: 64 MB (total). L2 cache: 1 MB (per core). Built on 4 nm process technology. Socket: FL1. Thermal design power (TDP): 55 Watt. Memory support: DDR5. Passmark benchmark score: 55,711 points. Launch price was $650.

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Processing Power

Both the EPYC 4545P and Ryzen 9 9955HX share an identical 16-core/32-thread configuration. Boost clocks reach 5.4 GHz on the EPYC 4545P versus 5.4 GHz on the Ryzen 9 9955HX — identical boost frequencies (base: 3 GHz vs 2.5 GHz). The EPYC 4545P uses the Grado (2025) architecture (4 nm), while the Ryzen 9 9955HX uses Fire Range-HX (Zen 5) (2025) (4 nm). In PassMark, the EPYC 4545P scores 54,255 against the Ryzen 9 9955HX's 55,711 — a 2.6% lead for the Ryzen 9 9955HX. Both processors carry 64 MB (total) of L3 cache.

Feature	EPYC 4545P	Ryzen 9 9955HX
Cores / Threads	16 / 32	16 / 32
Boost Clock	5.4 GHz	5.4 GHz
Base Clock	3 GHz+20%	2.5 GHz
L3 Cache	64 MB (total)	64 MB (total)
L2 Cache	1 MB (per core)	1 MB (per core)
Process	4 nm	4 nm
Architecture	Grado (2025)	Fire Range-HX (Zen 5) (2025)
PassMark	54,255	55,711+3%
Cinebench R23 Multi	—	38,010
Geekbench 6 Single	—	3,219
Geekbench 6 Multi	—	19,563

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Memory & Platform

The EPYC 4545P uses the AM5 socket (PCIe 4.0), while the Ryzen 9 9955HX uses FL1 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches 5600 on the EPYC 4545P versus DDR5-5600 on the Ryzen 9 9955HX — the EPYC 4545P supports 199.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. The EPYC 4545P supports up to 192 of RAM compared to 96 GB — 66.7% more capacity for professional workloads. Both feature 2-channel memory with ECC support. Both provide 28 PCIe lanes. Chipset compatibility: AM5 (EPYC 4545P) and AMD FL1 (Ryzen 9 9955HX).

Feature	EPYC 4545P	Ryzen 9 9955HX
Socket	AM5	FL1
PCIe Generation	PCIe 4.0	PCIe 5.0+25%
Max RAM Speed	5600+111900%	DDR5-5600
Max RAM Capacity	192	96 GB+52428700%
RAM Channels	2	2
ECC Support	Yes	Yes
PCIe Lanes	28	28

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Advanced Features

Both processors feature an unlocked multiplier for overclocking. Both support AVX-512 instructions, benefiting scientific computing, AI inference, and encryption workloads. Virtualization support: VT-x, VT-d, AMD-V (EPYC 4545P) vs true (Ryzen 9 9955HX). Both include integrated graphics — AMD Radeon Graphics (EPYC 4545P) and Radeon 610M (Ryzen 9 9955HX) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Direct competitor: EPYC 4545P rivals Ryzen 9 7900X; Ryzen 9 9955HX rivals Core Ultra 9 275HX.