EPYC 7551 vs Ryzen 5 7645HX

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 7551 vs Ryzen 5 7645HX 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 7551 vs Ryzen 5 7645HX: Pros, Cons & Final Verdict

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

EPYC 7551

2017

Why buy it

✅+100% larger total L3 cache (64 MB vs 32 MB).
✅Better for workstations and heavier parallel workloads: 32 cores / 64 threads.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 5 7645HX across 50 shared CPU benchmark tests.
❌Lower PassMark (25,844 vs 26,097).
❌300% higher power demand at 180W vs 45W.
❌Older platform position on TR4 with DDR4, while Ryzen 5 7645HX moves to FL1 and DDR5.
❌No integrated graphics, while Ryzen 5 7645HX can still boot and troubleshoot without a discrete GPU.

Ryzen 5 7645HX

2023

Why buy it

✅Better for gaming: +18.6% higher average FPS across 50 shared CPU benchmark tests.
✅Draws 45W instead of 180W, a 135W reduction.
✅Newer platform on FL1 with DDR5 support instead of TR4 and DDR4.
✅100+% more PCIe lanes (28 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Radeon 610M, while EPYC 7551 needs a discrete GPU.

Trade-offs

❌Smaller total L3 cache (32 MB vs 64 MB).
❌Less compelling for workstation-style loads than EPYC 7551, which brings 32 cores / 64 threads.

Quick Answers

So, is Ryzen 5 7645HX better than EPYC 7551?

Not really, because they are built for different jobs. EPYC 7551 makes more sense for workstation-style multi-core throughput, while Ryzen 5 7645HX is the more practical desktop choice for gaming, platform cost, and everyday use.

Which one is better for gaming?

If gaming is the priority, Ryzen 5 7645HX is the better pick. According to our tests, it delivers 18.6% more average FPS across 50 shared CPU game tests.

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

For streaming, content creation, and heavier multitasking, Ryzen 5 7645HX is the stronger fit. You are getting 1% better PassMark, backed by 6 cores and 12 threads.

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

Ryzen 5 7645HX still makes the most sense overall. Ryzen 5 7645HX comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you a 18.6% average FPS lead across 50 shared CPU game tests in our data.

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

Ryzen 5 7645HX makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2023 vs 2017), a healthier platform with FL1 and DDR5 instead of TR4, more multi-core headroom with 6 cores / 12 threads instead of 32/64, and AVX-512 support for heavier modern compute workloads. That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

EPYC 7551 vs Ryzen 5 7645HX Technical Specifications

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

EPYC 7551

The EPYC 7551 is manufactured by AMD. It was released in 29 June 2017 (8 years ago). It is based on the Naples (2017−2018) architecture. It features 32 cores and 64 threads. Base frequency is 2 GHz, with boost up to 3 GHz. L3 cache: 64 MB (total). L2 cache: 512K (per core). Built on 14 nm process technology. Socket: TR4. Thermal design power (TDP): 180 Watt. Memory support: DDR4 Eight-channel. Passmark benchmark score: 25,844 points. Launch price was $3,400.

Ryzen 5 7645HX

The Ryzen 5 7645HX is manufactured by AMD. It was released in 4 January 2023 (2 years ago). It is based on the Dragon Range (Zen4) (2023) architecture. It features 6 cores and 12 threads. Base frequency is 4 GHz, with boost up to 5 GHz. L3 cache: 32 MB (total). L2 cache: 1 MB (per core). Built on 5 nm process technology. Socket: FL1. Thermal design power (TDP): 45 Watt. Memory support: DDR5-5200. Passmark benchmark score: 26,097 points. Launch price was $299.

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Processing Power

The EPYC 7551 packs 32 cores / 64 threads, while the Ryzen 5 7645HX offers 6 cores / 12 threads — the EPYC 7551 has 26 more cores. Boost clocks reach 3 GHz on the EPYC 7551 versus 5 GHz on the Ryzen 5 7645HX — a 50% clock advantage for the Ryzen 5 7645HX (base: 2 GHz vs 4 GHz). The EPYC 7551 uses the Naples (2017−2018) architecture (14 nm), while the Ryzen 5 7645HX uses Dragon Range (Zen4) (2023) (5 nm). In PassMark, the EPYC 7551 scores 25,844 against the Ryzen 5 7645HX's 26,097 — a 1% lead for the Ryzen 5 7645HX. L3 cache: 64 MB (total) on the EPYC 7551 vs 32 MB (total) on the Ryzen 5 7645HX.

Feature	EPYC 7551	Ryzen 5 7645HX
Cores / Threads	32 / 64+433%	6 / 12
Boost Clock	3 GHz	5 GHz+67%
Base Clock	2 GHz	4 GHz+100%
L3 Cache	64 MB (total)+100%	32 MB (total)
L2 Cache	512K (per core)+51100%	1 MB (per core)
Process	14 nm	5 nm-64%
Architecture	Naples (2017−2018)	Dragon Range (Zen4) (2023)
PassMark	25,844	26,097
Cinebench R23 Multi	—	13,985
Geekbench 6 Single	—	2,588
Geekbench 6 Multi	—	11,717

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Memory & Platform

The EPYC 7551 uses the TR4 socket (PCIe 4.0), while the Ryzen 5 7645HX uses FL1 (PCIe 5.0) — making them incompatible on the same motherboard.

Feature	EPYC 7551	Ryzen 5 7645HX
Socket	TR4	FL1
PCIe Generation	PCIe 4.0	PCIe 5.0+25%
Max RAM Speed	—	DDR5-5200
Max RAM Capacity	—	64 GB
RAM Channels	—	2
ECC Support	—	No
PCIe Lanes	—	28

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Advanced Features

Virtualization: not specified (EPYC 7551) / AMD-V (SVM) (Ryzen 5 7645HX). The Ryzen 5 7645HX includes integrated graphics (Radeon 610M), while the EPYC 7551 requires a dedicated GPU. Primary use case: Ryzen 5 7645HX targets Gaming. Direct competitor: Ryzen 5 7645HX rivals Core i5-13500HX.