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 8434P

2023

Why buy it

✅+100% larger total L3 cache (128 MB vs 64 MB).
✅Draws 200W instead of 350W, a 150W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen Threadripper PRO 9955WX across 36 shared CPU benchmark tests.
❌Lower PassMark (66,490 vs 67,561).
❌Lower PassMark per dollar, at 43.8 vs 157.5 PassMark/$ ($1,517 MSRP vs $429 MSRP).

Ryzen Threadripper PRO 9955WX

2025

Why buy it

✅Better for gaming: +26.5% higher average FPS across 36 shared CPU benchmark tests.
✅Costs $1,088 less on MSRP ($429 MSRP vs $1,517 MSRP).
✅Delivers 259.3% more PassMark for each dollar spent, at 157.5 vs 43.8 PassMark/$ ($429 MSRP vs $1,517 MSRP).
✅33.3% more PCIe lanes (128 vs 96) for storage and expansion-heavy builds.

Trade-offs

❌Smaller total L3 cache (64 MB vs 128 MB).
❌75% higher power demand at 350W vs 200W.

EPYC 8434P

2023

Ryzen Threadripper PRO 9955WX

2025

Why buy it

✅+100% larger total L3 cache (128 MB vs 64 MB).
✅Draws 200W instead of 350W, a 150W reduction.

Why buy it

✅Better for gaming: +26.5% higher average FPS across 36 shared CPU benchmark tests.
✅Costs $1,088 less on MSRP ($429 MSRP vs $1,517 MSRP).
✅Delivers 259.3% more PassMark for each dollar spent, at 157.5 vs 43.8 PassMark/$ ($429 MSRP vs $1,517 MSRP).
✅33.3% more PCIe lanes (128 vs 96) for storage and expansion-heavy builds.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen Threadripper PRO 9955WX across 36 shared CPU benchmark tests.
❌Lower PassMark (66,490 vs 67,561).
❌Lower PassMark per dollar, at 43.8 vs 157.5 PassMark/$ ($1,517 MSRP vs $429 MSRP).

Trade-offs

❌Smaller total L3 cache (64 MB vs 128 MB).
❌75% higher power demand at 350W vs 200W.

Quick Answers

So, is Ryzen Threadripper PRO 9955WX better than EPYC 8434P?

Yes. Ryzen Threadripper PRO 9955WX is the better overall CPU here. You are getting a 26.5% average FPS lead across 36 shared CPU game tests in our data, 1.6% better PassMark, and the stronger long-term platform, which makes it the stronger all-around choice.

Which one is better for gaming?

If gaming is the priority, Ryzen Threadripper PRO 9955WX is the better pick here. According to our tests, it delivers 26.5% more average FPS across 36 shared CPU game tests.

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

For streaming, content creation, and heavier multitasking, Ryzen Threadripper PRO 9955WX is the better fit. You are getting 1.6% better PassMark, backed by 16 cores and 32 threads.

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

Ryzen Threadripper PRO 9955WX is the smarter buy today. Ryzen Threadripper PRO 9955WX is $1,088 cheaper on MSRP at $429 MSRP versus $1,517 MSRP, and it gives you a 26.5% average FPS lead across 36 shared CPU game tests in our data. It is also 259.3% better value on MSRP (157.5 vs 43.8 PassMark/$), so the better CPU is not just faster, it is also the cleaner value play on paper.

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

Ryzen Threadripper PRO 9955WX is the more future-proof choice for 2026 and beyond. You are getting a newer CPU generation (2025 vs 2023) and more multi-core headroom with 16 cores / 32 threads instead of 48/96. That should give you a better long-term upgrade path for motherboard, RAM, and future CPU swaps.

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 8434P Benchmark Check

Ryzen Threadripper PRO 9955WX Benchmark Check

Path of Exile 2

Preset	EPYC 8434P	Ryzen Threadripper PRO 9955WX
1080p
low	159 FPS	297 FPS
medium	131 FPS	270 FPS
high	110 FPS	223 FPS
ultra	87 FPS	188 FPS
1440p
low	142 FPS	273 FPS
medium	114 FPS	224 FPS
high	90 FPS	174 FPS
ultra	72 FPS	153 FPS
4K
low	68 FPS	187 FPS
medium	58 FPS	154 FPS
high	45 FPS	118 FPS
ultra	37 FPS	104 FPS

Open EPYC 8434P Open Ryzen Threadripper PRO 9955WX

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	EPYC 8434P	Ryzen Threadripper PRO 9955WX
1080p
low	419 FPS	786 FPS
medium	369 FPS	643 FPS
high	300 FPS	477 FPS
ultra	236 FPS	403 FPS
1440p
low	344 FPS	647 FPS
medium	311 FPS	549 FPS
high	260 FPS	422 FPS
ultra	199 FPS	328 FPS
4K
low	212 FPS	363 FPS
medium	195 FPS	312 FPS
high	163 FPS	273 FPS
ultra	132 FPS	230 FPS

Open EPYC 8434P Open Ryzen Threadripper PRO 9955WX

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	EPYC 8434P	Ryzen Threadripper PRO 9955WX
1080p
low	860 FPS	888 FPS
medium	786 FPS	705 FPS
high	760 FPS	622 FPS
ultra	682 FPS	534 FPS
1440p
low	663 FPS	713 FPS
medium	587 FPS	567 FPS
high	558 FPS	489 FPS
ultra	498 FPS	414 FPS
4K
low	435 FPS	507 FPS
medium	344 FPS	418 FPS
high	307 FPS	375 FPS
ultra	250 FPS	315 FPS

Open EPYC 8434P Open Ryzen Threadripper PRO 9955WX

League of Legends

League of Legends

Valorant

Preset	EPYC 8434P	Ryzen Threadripper PRO 9955WX
1080p
low	1023 FPS	1106 FPS
medium	913 FPS	991 FPS
high	772 FPS	867 FPS
ultra	651 FPS	781 FPS
1440p
low	833 FPS	860 FPS
medium	712 FPS	759 FPS
high	598 FPS	664 FPS
ultra	492 FPS	576 FPS
4K
low	600 FPS	632 FPS
medium	524 FPS	562 FPS
high	451 FPS	496 FPS
ultra	376 FPS	429 FPS

Open EPYC 8434P Open Ryzen Threadripper PRO 9955WX

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of EPYC 8434P and Ryzen Threadripper PRO 9955WX

EPYC 8434P

The EPYC 8434P is manufactured by AMD. It was released in 18 September 2023 (2 years ago). It is based on the Siena (2023−2024) architecture. It features 48 cores and 96 threads. Base frequency is 2.5 GHz, with boost up to 3.1 GHz. L3 cache: 128 MB (total). L2 cache: 1 MB (per core). Built on 5 nm process technology. Socket: SP6. Thermal design power (TDP): 200 Watt. Memory support: DDR5. Passmark benchmark score: 66,490 points. Launch price was $2,700.

Ryzen Threadripper PRO 9955WX

The Ryzen Threadripper PRO 9955WX is manufactured by AMD. It was released in 23 July 2025 (less than a year ago). It is based on the Shimada Peak (2025) architecture. It features 16 cores and 32 threads. Base frequency is 4.5 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: sTR5. Thermal design power (TDP): 350 Watt. Memory support: DDR5. Passmark benchmark score: 67,561 points. Launch price was $1,649.

⚡

Processing Power

The EPYC 8434P packs 48 cores / 96 threads, while the Ryzen Threadripper PRO 9955WX offers 16 cores / 32 threads — the EPYC 8434P has 32 more cores. Boost clocks reach 3.1 GHz on the EPYC 8434P versus 5.4 GHz on the Ryzen Threadripper PRO 9955WX — a 54.1% clock advantage for the Ryzen Threadripper PRO 9955WX (base: 2.5 GHz vs 4.5 GHz). The EPYC 8434P uses the Siena (2023−2024) architecture (5 nm), while the Ryzen Threadripper PRO 9955WX uses Shimada Peak (2025) (4 nm). In PassMark, the EPYC 8434P scores 66,490 against the Ryzen Threadripper PRO 9955WX's 67,561 — a 1.6% lead for the Ryzen Threadripper PRO 9955WX. L3 cache: 128 MB (total) on the EPYC 8434P vs 64 MB (total) on the Ryzen Threadripper PRO 9955WX.

Feature	EPYC 8434P	Ryzen Threadripper PRO 9955WX
Cores / Threads	48 / 96+200%	16 / 32
Boost Clock	3.1 GHz	5.4 GHz+74%
Base Clock	2.5 GHz	4.5 GHz+80%
L3 Cache	128 MB (total)+100%	64 MB (total)
L2 Cache	1 MB (per core)	1 MB (per core)
Process	5 nm	4 nm-20%
Architecture	Siena (2023−2024)	Shimada Peak (2025)
PassMark	66,490	67,561+2%
Cinebench R23 Multi	—	40,000
Geekbench 6 Single	—	3,016
Geekbench 6 Multi	—	23,596

🧠

Memory & Platform

The EPYC 8434P uses the SP6 socket (PCIe 4.0), while the Ryzen Threadripper PRO 9955WX uses sTR5 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches 4800 on the EPYC 8434P versus DDR5-6400 on the Ryzen Threadripper PRO 9955WX — the EPYC 8434P supports 199.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Ryzen Threadripper PRO 9955WX supports up to 2048 GB of RAM compared to 1152 — 56% more capacity for professional workloads. Memory channels: 6 (EPYC 8434P) vs 8 (Ryzen Threadripper PRO 9955WX). PCIe lanes: 96 (EPYC 8434P) vs 128 (Ryzen Threadripper PRO 9955WX) — the Ryzen Threadripper PRO 9955WX offers 32 more lanes for additional GPUs or NVMe drives. Chipset compatibility: SP6 (EPYC 8434P) and WRX90 (Ryzen Threadripper PRO 9955WX).

Feature	EPYC 8434P	Ryzen Threadripper PRO 9955WX
Socket	SP6	sTR5
PCIe Generation	PCIe 4.0	PCIe 4.0
Max RAM Speed	4800+95900%	DDR5-6400
Max RAM Capacity	1152	2048 GB+186413411%
RAM Channels	6	8+33%
ECC Support	Yes	Yes
PCIe Lanes	96	128+33%

🔧

Advanced Features

Only the Ryzen Threadripper PRO 9955WX has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Both support AVX-512 instructions, benefiting scientific computing, AI inference, and encryption workloads. Virtualization support: VT-x, VT-d (EPYC 8434P) vs true (Ryzen Threadripper PRO 9955WX). Direct competitor: EPYC 8434P rivals Xeon Platinum 8452Y; Ryzen Threadripper PRO 9955WX rivals Xeon w7-3555.

Feature	EPYC 8434P	Ryzen Threadripper PRO 9955WX
Integrated GPU	No	No
IGPU Model	None	None
Unlocked	No	Yes
AVX-512	Yes	Yes
Virtualization	VT-x, VT-d	true

💰

Value Analysis

The EPYC 8434P launched at $1517 MSRP, while the Ryzen Threadripper PRO 9955WX debuted at $429. On MSRP ($1517 vs $429), the Ryzen Threadripper PRO 9955WX is $1088 cheaper. In terms of value on MSRP (PassMark points per dollar), the EPYC 8434P delivers 43.8 pts/$ vs 157.5 pts/$ for the Ryzen Threadripper PRO 9955WX — making the Ryzen Threadripper PRO 9955WX the 112.9% better value option.