Xeon E5645 vs FX-8320E
Xeon E5645
FX-8320E
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 Xeon E5645 is positioned at rank 669 and the FX-8320E is on rank 555, 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 Xeon E5645
Performance Per Dollar FX-8320E
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Xeon E5645 | FX-8320E |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ⚠️ Higher cost ($294) | ✅ More affordable ($60) |
| Longevity | 🛑 Legacy (Westmere-EP (2010−2011) / 32 nm) | 🛑 Legacy (Vishera (2012−2015) / 32 nm) |
💎 Value Proposition
| Insight | Xeon E5645 | FX-8320E |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ✅ Better overall value (+392%) |
| Upfront Cost | ⚠️ Higher cost ($294) | ✅ More affordable ($60) |
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 Xeon E5645 and FX-8320E
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.
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.
Processing Power
The Xeon E5645 packs 6 cores / 12 threads, while the FX-8320E offers 8 cores / 8 threads — the FX-8320E has 2 more cores. Boost clocks reach 2.67 GHz on the Xeon E5645 versus 4 GHz on the FX-8320E — a 39.9% clock advantage for the FX-8320E (base: 2.4 GHz vs 3.2 GHz). The Xeon E5645 uses the Westmere-EP (2010−2011) architecture (32 nm), while the FX-8320E uses Vishera (2012−2015) (32 nm). In PassMark, the Xeon E5645 scores 4,942 against the FX-8320E's 4,960 — a 0.4% lead for the FX-8320E.
| Feature | Xeon E5645 | FX-8320E |
|---|---|---|
| Cores / Threads | 6 / 12 | 8 / 8+33% |
| Boost Clock | 2.67 GHz | 4 GHz+50% |
| Base Clock | 2.4 GHz | 3.2 GHz+33% |
| L3 Cache | 12 MB (total) | — |
| L2 Cache | 256 kB (per core) | 8192 kB+3100% |
| Process | 32 nm | 32 nm |
| Architecture | Westmere-EP (2010−2011) | Vishera (2012−2015) |
| PassMark | 4,942 | 4,960 |
| Geekbench 6 Single | — | 439 |
| Geekbench 6 Multi | — | 1,734 |
Memory & Platform
The Xeon E5645 uses the LGA1366 socket (PCIe 5.0), while the FX-8320E uses AM3+ (PCIe 2.0) — making them incompatible on the same motherboard. Both support up to DDR3-1333 memory speed. The Xeon E5645 supports up to 288 GB of RAM compared to 32 GB — 160% more capacity for professional workloads. Memory channels: 3 (Xeon E5645) vs 2 (FX-8320E). Both provide 0 PCIe lanes.
| Feature | Xeon E5645 | FX-8320E |
|---|---|---|
| Socket | LGA1366 | AM3+ |
| PCIe Generation | PCIe 5.0+150% | PCIe 2.0 |
| Max RAM Speed | DDR3-1333 | DDR3-1866 |
| Max RAM Capacity | 288 GB+800% | 32 GB |
| RAM Channels | 3+50% | 2 |
| 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: VT-x (Xeon E5645) vs AMD-V (FX-8320E). Primary use case: Xeon E5645 targets Server.
| Feature | Xeon E5645 | FX-8320E |
|---|---|---|
| Integrated GPU | No | No |
| Unlocked | No | Yes |
| AVX-512 | No | No |
| Virtualization | VT-x | AMD-V |
| Target Use | Server | — |
Value Analysis
The Xeon E5645 launched at $294 MSRP, while the FX-8320E debuted at $147.
| Feature | Xeon E5645 | FX-8320E |
|---|---|---|
| MSRP | $294 | $147-50% |
| Avg Price (30d) | — | $60 |
| Release Date | 2010 | 2014 |
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