AMD Athlon II X4 645 vs AMD Athlon X4 940
Physical Specifications
| Socket | AMD Socket AM3 | AMD Socket AM4 |
|---|---|---|
| Process size | 45 nm | 28 nm |
| Transistors | 300 million | 1,178 million |
| Die size | 169 mm² | 246 mm² |
| Package | µPGA | µPGA |
| tCaseMax | — | 74°C |
Performance
| Frequency | 3.1 GHz | 3.2 GHz |
|---|---|---|
| Turbo clock | — | up to 3.6 GHz |
| Base clock | 200 MHz | 100 MHz |
| Multiplier | 15.5x | 32.0x |
| Multiplier unlocked | No | Yes |
| Voltage | 1.4 V | 1.475 V |
| TDP | 95 W | 65 W |
Architecture Details
| Vertical Segment | Desktop | Desktop |
|---|---|---|
| Production status | End-of-life | Active |
| Release date | Sep 21st, 2010 | Jul 27th, 2017 |
| Codename | Propus | Bristol Ridge |
| Generation | Athlon II X4 | Athlon |
| Part | ADX645WFK42GMADX645WFGMBOX | AD940XAGM44AB |
| Memory support | DDR3 Dual-channel | DDR4 Dual-channel |
| ECC memory | No | No |
| PCI Express | Gen 2 | — |
Cores
| Total Cores | 4 | 4 |
|---|---|---|
| Total Threads | 4 | 4 |
| SMP # CPUs | 1 | 1 |
| Integrated graphics | — | — |
Cache
| Cache L1 | 128K (per core) | 128K (per core) |
|---|---|---|
| Cache L2 | 512K (per core) | 512K (per core) |
Features & Technologies
| 3DNow! | Yes | Yes |
|---|---|---|
| AES | — | Yes |
| AMD-V | Yes | Yes |
| AMD64 | Yes | Yes |
| AVX | — | Yes |
| AVX2 | — | Yes |
| BMI1 | — | Yes |
| BMI2 | — | Yes |
| EVP | — | Yes |
| F16C | — | Yes |
| FMA3 | — | Yes |
| FMA4 | — | Yes |
| MMX | Yes | Yes |
| NX bit | Yes | — |
| SSE | Yes | Yes |
| SSE2 | Yes | Yes |
| SSE3 | Yes | Yes |
| SSE4 | — | Yes |
| SSE4.1 | — | Yes |
| SSE4.2 | — | Yes |
| SSE4A | Yes | Yes |
| TBM | — | Yes |
| Turbo Core | — | Yes |
| XOP | — | Yes |
Notes
| Notes | — | This processor comes with an unlocked base clock multiplier, allowing users to set the multiplier value higher than shipped value, to facilitate better overclocking. |
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