FX-8320E vs Xeon E5645
FX-8320E
Xeon E5645
Performance Spectrum - CPU
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. Components placed above yours deliver better value for money. The FX-8320E is positioned at rank 555 and the Xeon E5645 is on rank 669, so the FX-8320E offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar FX-8320E
Performance Per Dollar Xeon E5645
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | FX-8320E | Xeon E5645 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ✅ Better multi-core power | ❌ Weaker in multi-core tasks |
| Price | ✅ More affordable ($60) | ⚠️ Higher cost ($294) |
| Longevity | 🛑 Legacy (Vishera (2012−2015) / 32 nm) | 🛑 Legacy (Westmere-EP (2010−2011) / 32 nm) |
💎 Value Proposition
| Insight | FX-8320E | Xeon E5645 |
|---|---|---|
| Cost Efficiency | ✅ Better overall value (+392%) | ❌ Lower cost efficiency |
| Upfront Cost | ✅ More affordable ($60) | ⚠️ Higher cost ($294) |
Performance Check
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.
Technical Specifications
Side-by-side comparison of FX-8320E and Xeon E5645
FX-8320E
The FX-8320E is manufactured by AMD. It was released in 2 September 2014 (11 years ago). It is based on the Vishera (2012−2015) architecture. It features 8 cores and 8 threads. Base frequency is 3.2 GHz, with boost up to 4 GHz. L2 cache: 8192 kB. Built on 32 nm process technology. Socket: AM3+. Thermal design power (TDP): 95 Watt. Memory support: DDR3. Passmark benchmark score: 4,960 points. Launch price was $147.
Xeon E5645
The Xeon E5645 is manufactured by Intel. It was released in 16 March 2010 (15 years ago). It is based on the Westmere-EP (2010−2011) architecture. It features 6 cores and 12 threads. Base frequency is 2.4 GHz, with boost up to 2.67 GHz. L3 cache: 12 MB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA1366. Thermal design power (TDP): 80 Watt. Memory support: DDR3. Passmark benchmark score: 4,942 points. Launch price was $294.
Processing Power
The FX-8320E packs 8 cores / 8 threads, while the Xeon E5645 offers 6 cores / 12 threads — the FX-8320E has 2 more cores. Boost clocks reach 4 GHz on the FX-8320E versus 2.67 GHz on the Xeon E5645 — a 39.9% clock advantage for the FX-8320E (base: 3.2 GHz vs 2.4 GHz). The FX-8320E uses the Vishera (2012−2015) architecture (32 nm), while the Xeon E5645 uses Westmere-EP (2010−2011) (32 nm). In PassMark, the FX-8320E scores 4,960 against the Xeon E5645's 4,942 — a 0.4% lead for the FX-8320E.
| Feature | FX-8320E | Xeon E5645 |
|---|---|---|
| Cores / Threads | 8 / 8+33% | 6 / 12 |
| Boost Clock | 4 GHz+50% | 2.67 GHz |
| Base Clock | 3.2 GHz+33% | 2.4 GHz |
| L3 Cache | — | 12 MB (total) |
| L2 Cache | 8192 kB+3100% | 256 kB (per core) |
| Process | 32 nm | 32 nm |
| Architecture | Vishera (2012−2015) | Westmere-EP (2010−2011) |
| PassMark | 4,960 | 4,942 |
| Geekbench 6 Single | 439 | — |
| Geekbench 6 Multi | 1,734 | — |
Memory & Platform
The FX-8320E uses the AM3+ socket (PCIe 2.0), while the Xeon E5645 uses LGA1366 (PCIe 5.0) — making them incompatible on the same motherboard. Both support up to DDR3-1866 memory speed. The Xeon E5645 supports up to 288 GB of RAM compared to 32 GB — 160% more capacity for professional workloads. Memory channels: 2 (FX-8320E) vs 3 (Xeon E5645). Both provide 0 PCIe lanes.
| Feature | FX-8320E | Xeon E5645 |
|---|---|---|
| Socket | AM3+ | LGA1366 |
| PCIe Generation | PCIe 2.0 | PCIe 5.0+150% |
| Max RAM Speed | DDR3-1866 | DDR3-1333 |
| Max RAM Capacity | 32 GB | 288 GB+800% |
| RAM Channels | 2 | 3+50% |
| ECC Support | ❌ | ✅ |
| PCIe Lanes | 0 | 0 |
Advanced Features
Only the FX-8320E has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Virtualization support: AMD-V (FX-8320E) vs VT-x (Xeon E5645). Primary use case: Xeon E5645 targets Server.
| Feature | FX-8320E | Xeon E5645 |
|---|---|---|
| Integrated GPU | No | No |
| Unlocked | Yes | No |
| AVX-512 | No | No |
| Virtualization | AMD-V | VT-x |
| Target Use | — | Server |
Value Analysis
The FX-8320E launched at $147 MSRP, while the Xeon E5645 debuted at $294.
| Feature | FX-8320E | Xeon E5645 |
|---|---|---|
| MSRP | $147-50% | $294 |
| Avg Price (30d) | $60 | — |
| Release Date | 2014 | 2010 |
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