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.

EPYC 4545P vs Ryzen 9 9955HX FPS Benchmarks

Predicted gaming performance across popular games. Tested paired with GeForce RTX 5090 to isolate CPU performance.

Search any supported game below to compare 1080p FPS for both components.

EPYC 4545P vs Ryzen 9 9955HX: Pros, Cons & Final Verdict

See where each CPU makes more sense in practice: gaming, heavier work, platform cost, power draw, and upgrade path.

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.

Quick Answers

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

Not really, because they are built for different jobs. EPYC 4545P makes more sense for workstation-style multi-core throughput, while Ryzen 9 9955HX is the more practical desktop choice for gaming, platform cost, and everyday use.

Which one is better for gaming?

For gaming, this matchup is basically a tie in the data we have.

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

For streaming, content creation, and heavier multitasking, Ryzen 9 9955HX is the stronger 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 is easier to justify if budget matters more than peak performance. Ryzen 9 9955HX comes in at an unclear MSRP at unclear MSRP versus $549 MSRP, and it still gives you a 0.5% average FPS lead across 50 shared CPU game tests in our data. EPYC 4545P is also 100.0% better value on MSRP (98.8 vs 0.0 PassMark/$), which is why it can still make sense for tighter-budget builds on paper.

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

Ryzen 9 9955HX makes more sense long term for 2026 and beyond. You are getting more multi-core headroom with 16 cores / 32 threads instead of 16/32. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

EPYC 4545P vs Ryzen 9 9955HX Technical Specifications

Side-by-side specs, architecture details, clocks, memory, power, and platform differences.

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. Both support up to 5600 memory speed. The EPYC 4545P supports up to 192 GB of RAM compared to 96 GB — 100% 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	DDR5-5600
Max RAM Capacity	192 GB+100%	96 GB
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.