Athlon II X4 645 vs Ryzen 9 5900X

Athlon II X4 645

4 Cores4 Thrd95 WWMax: 3.1 GHz2010

Ryzen 9 5900X

12 Cores24 Thrd105 WWMax: 4.8 GHz2020

Performance Spectrum - CPU

Athlon II X4 645

4 / 4

2,375

0.0%

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Ryzen 9 5900X

12 / 24

38,955

+1540.2%

Ryzen Threadripper 9960X

Ryzen Threadripper PRO 9975WX

About PassMark

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.

Value Upgrade Path

This is the official ChipVERSUS Value Rating, comparing raw performance (PassMark) per dollar. The Athlon II X4 645 is positioned at rank #819 in our cost-efficiency ranking, representing a Lower cost-benefit for your build. Components placed above yours deliver better value for money.

MSRP is the manufacturer's suggested retail price.•
Avg price is the current average price collected from markets across the web.

Performance Per Dollar Athlon II X4 645

Ryzen 9 7950X

MSRP: $194|Avg: $20

16537%

Core i9-10900T

MSRP: $120|Avg: $5

15625%

Ryzen 3 PRO 4355GE

MSRP: $423|Avg: $5

11345%

Ryzen Threadripper 3960X

MSRP: $1399|Avg: $85

3418%

Ryzen 9 9950X

MSRP: $649|Avg: $129

2707%

Ryzen 5 8400F

MSRP: $303|Avg: $55

2368%

Ryzen 7 PRO 2700

MSRP: $299|Avg: $60

1356%

Ryzen 5 2600X

MSRP: $229|Avg: $55

1339%

Ryzen 3 PRO 5350G

MSRP: $150|Avg: $60

1219%

#10

Core Ultra 5 245KF

MSRP: $294|Avg: $189

1219%

#11

Ryzen 5 5500

MSRP: $159|Avg: $85

1205%

#12

Ryzen 5 3600

MSRP: $199|Avg: $80

1173%

#13

Core i3-9100E

MSRP: $202|Avg: $30

1156%

#14

Core Ultra 5 245K

MSRP: $319|Avg: $200

1152%

#15

Core i3-8300T

MSRP: $138|Avg: $25

1141%

#295

Core i9-7940X

MSRP: $1399|Avg: $275

96%

#819

Athlon II X4 645

MSRP: $126|Avg: $20

100%

#820

Core i5-7400

MSRP: $294|Avg: $70

99%

#821

Pentium E5800

MSRP: $64|Avg: $15

99%

#822

Core i7-6820EQ

MSRP: $378|Avg: $344

99%

#823

A6-9500

MSRP: $101|Avg: $25

99%

#824

Pentium G2120T

MSRP: $87|Avg: $10

98%

#825

Athlon II X2 270

MSRP: $72|Avg: $15

98%

#827

Core i7-6850K

MSRP: $617|Avg: $80

98%

#828

Core i5-2500K

MSRP: $225|Avg: $35

98%

#829

Pentium G3430

MSRP: $116|Avg: $30

97%

#830

Pentium E5400

MSRP: $55|Avg: $49

97%

#831

Core i5-4570R

MSRP: $250|Avg: $20

97%

#832

A6-3650

MSRP: $115|Avg: $20

97%

#833

Core i7-4770R

MSRP: $360|Avg: $89

97%

Based on actual market prices and performance synthetic scores.

Performance Per Dollar Ryzen 9 5900X

#141

Core i9-13900K

MSRP: $599|Avg: $500

105%

#142

Core i3-14100

MSRP: $134|Avg: $131

104%

#143

Ryzen 5 3400G

MSRP: $149|Avg: $80

103%

#144

Core i7-10700KF

MSRP: $405|Avg: $160

103%

#145

Core i5-11600K

MSRP: $262|Avg: $170

103%

#146

Core i7-13700K

MSRP: $409|Avg: $400

103%

#147

Ryzen 5 PRO 3400G

MSRP: $149|Avg: $80

102%

#148

Ryzen 7 PRO 2700X

MSRP: $329|Avg: $150

102%

#149

Core i9-12900KS

MSRP: $739|Avg: $385

102%

#150

Ryzen 5 5500X3D

MSRP: $185|Avg: $180

101%

#151

Core Ultra 7 265T

MSRP: $384|Avg: $362

101%

#152

Ryzen 3 3200GE

MSRP: $85|Avg: $64

101%

#153

Core i3-9100T

MSRP: $122|Avg: $50

101%

#154

Ryzen 5 4600G

MSRP: $154|Avg: $143

100%

#155

Core i7-13700T

MSRP: $384|Avg: $250

100%

#156

Ryzen 9 5900X

MSRP: $549|Avg: $350

100%

#157

Core i7-13700F

MSRP: $359|Avg: $345

100%

#158

Core i5-13600T

MSRP: $255|Avg: $255

99%

#159

Ryzen 5 3400GE

MSRP: $149|Avg: $80

99%

#160

Core i7-12700F

MSRP: $314|Avg: $275

99%

#161

Core i5-9400

MSRP: $192|Avg: $85

99%

#162

Core i3-13100

MSRP: $134|Avg: $128

99%

#163

Core i9-10910

MSRP: $488|Avg: $200

96%

#164

Core i5-14600T

MSRP: $255|Avg: $255

96%

#165

Core i5-11500T

MSRP: $192|Avg: $120

95%

#166

Ryzen 7 5700X3D

MSRP: $249|Avg: $249

95%

#167

Ryzen 3 8300GE

MSRP: $129|Avg: $129

95%

#168

Core i3-13100T

MSRP: $134|Avg: $122

94%

#169

Core i5-10600T

MSRP: $213|Avg: $110

94%

#170

Ryzen 3 3200G

MSRP: $100|Avg: $67

94%

#171

Core Ultra 9 285

MSRP: $589|Avg: $550

94%

Based on actual market prices and performance synthetic scores.

Performance Comparison

About PassMark

🏆 Chipversus Verdict

🚀 Performance Leadership

Generational Difference: This comparison involves processors from different technological eras. The Ryzen 9 5900X (2020) utilizes 7 nm, 12 nm technology and DDR4-3200, providing a fundamental performance advantage.

Insight	Athlon II X4 645	Ryzen 9 5900X
Gaming	❌ Lower gaming performance	✅ Superior gaming performance
Workstation	❌ Weaker in multi-core tasks	✅ Better multi-core power
Price	✅ More affordable ($20)	⚠️ Higher cost ($350)
Longevity	🛑 Legacy (Propus (2009−2011) / 45 nm)	✨ Modern (Vermeer (Zen3) (2020−2022) / 7 nm, 12 nm)

💎 Value Proposition

The Athlon II X4 645 (2010) relies on 45 nm technology and DDR3, placing it in a different performance category relative to modern standards.

Insight	Athlon II X4 645	Ryzen 9 5900X
Cost Efficiency	✅ Better overall value (+7%)	❌ Lower cost efficiency
Upfront Cost	✅ More affordable ($20)	⚠️ Higher cost ($350)

Performance Check

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.

Athlon II X4 645 Benchmark Check

Ryzen 9 5900X Benchmark Check

Technical Specifications

Side-by-side comparison of Athlon II X4 645 and Ryzen 9 5900X

Athlon II X4 645

The Athlon II X4 645 is manufactured by AMD. It was released in 21 September 2010 (15 years ago). It is based on the Propus (2009−2011) architecture. It features 4 cores and 4 threads. Base frequency is 3.1 GHz, with boost up to 3.1 GHz. L3 cache: 0 kB. L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: AM3. Thermal design power (TDP): 95 Watt. Memory support: DDR3. Passmark benchmark score: 2,375 points. Launch price was $80.

Ryzen 9 5900X

The Ryzen 9 5900X is manufactured by AMD. It was released in 5 November 2020 (5 years ago). It is based on the Vermeer (Zen3) (2020−2022) architecture. It features 12 cores and 24 threads. Base frequency is 3.7 GHz, with boost up to 4.8 GHz. L3 cache: 64 MB. L2 cache: 512K (per core). Built on 7 nm, 12 nm process technology. Socket: AM4. Thermal design power (TDP): 105 Watt. Memory support: DDR4-3200. Passmark benchmark score: 38,955 points. Launch price was $549.

⚡

Processing Power

The Athlon II X4 645 packs 4 cores / 4 threads, while the Ryzen 9 5900X offers 12 cores / 24 threads — the Ryzen 9 5900X has 8 more cores. Boost clocks reach 3.1 GHz on the Athlon II X4 645 versus 4.8 GHz on the Ryzen 9 5900X — a 43% clock advantage for the Ryzen 9 5900X (base: 3.1 GHz vs 3.7 GHz). The Athlon II X4 645 uses the Propus (2009−2011) architecture (45 nm), while the Ryzen 9 5900X uses Vermeer (Zen3) (2020−2022) (7 nm, 12 nm). In PassMark, the Athlon II X4 645 scores 2,375 against the Ryzen 9 5900X's 38,955 — a 177% lead for the Ryzen 9 5900X. Cinebench R23 multi-core: 1,374 vs 21,000 (175.4% advantage for the Ryzen 9 5900X). Geekbench 6 single-core — the metric most relevant to gaming — records 399 vs 2,174, a 138% lead for the Ryzen 9 5900X that directly translates to higher frame rates. Multi-core Geekbench: 1,374 vs 11,888 (158.6% advantage for the Ryzen 9 5900X). L3 cache: 0 kB on the Athlon II X4 645 vs 64 MB on the Ryzen 9 5900X.

Feature	Athlon II X4 645	Ryzen 9 5900X
Cores / Threads	4 / 4	12 / 24+200%
Boost Clock	3.1 GHz	4.8 GHz+55%
Base Clock	3.1 GHz	3.7 GHz+19%
L3 Cache	0 kB	64 MB
L2 Cache	512 kB (per core)	512K (per core)
Process	45 nm	7 nm, 12 nm-84%
Architecture	Propus (2009−2011)	Vermeer (Zen3) (2020−2022)
PassMark	2,375	38,955+1540%
Cinebench R23 Multi	1,374	21,000+1428%
Geekbench 6 Single	399	2,174+445%
Geekbench 6 Multi	1,374	11,888+765%

🧠

Memory & Platform

The Athlon II X4 645 uses the AM3 socket (PCIe 2.0), while the Ryzen 9 5900X uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3-1333 on the Athlon II X4 645 versus DDR4-3200 on the Ryzen 9 5900X — the Ryzen 9 5900X supports 28.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Ryzen 9 5900X supports up to 128 GB of RAM compared to 16 GB — 155.6% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Athlon II X4 645) vs 24 (Ryzen 9 5900X) — the Ryzen 9 5900X offers 8 more lanes for additional GPUs or NVMe drives. Chipset compatibility: AMD 700 Series,AMD 800 Series,AMD 900 Series (Athlon II X4 645) and A320,B350,X370,B450,X470,B550,X570 (Ryzen 9 5900X).

Feature	Athlon II X4 645	Ryzen 9 5900X
Socket	AM3	AM4
PCIe Generation	PCIe 2.0	PCIe 4.0+100%
Max RAM Speed	DDR3-1333	DDR4-3200+33%
Max RAM Capacity	16 GB	128 GB+700%
RAM Channels	2	2
ECC Support	❌	✅
PCIe Lanes	16	24+50%

🔧

Advanced Features

Virtualization support: Yes (Athlon II X4 645) vs AMD-V (Ryzen 9 5900X). Primary use case: Athlon II X4 645 targets Desktop, Ryzen 9 5900X targets Workstation. Direct competitor: Ryzen 9 5900X rivals Core i9-12900K.

Feature	Athlon II X4 645	Ryzen 9 5900X
Integrated GPU	No	No
Unlocked	—	Yes
AVX-512	No	No
Virtualization	Yes	AMD-V
Target Use	Desktop	Workstation

💰

Value Analysis

The Athlon II X4 645 launched at $126 MSRP, while the Ryzen 9 5900X debuted at $549. At current prices ($20 vs $350), the Athlon II X4 645 is $330 cheaper. In terms of value (PassMark points per dollar), the Athlon II X4 645 delivers 118.8 pts/$ vs 111.3 pts/$ for the Ryzen 9 5900X — making the Athlon II X4 645 the 6.5% better value option.