| Tesla K20X | Tesla K40 | |
| SMX | 14 | 15 |
| CUDA Cores | 2,688 | 2,880 |
| Memory | 6 GB | 12 GB |
| Core Frequency | 732 MHz | 745 MHz |
| Max. Frequency | 784 MHz | 875 MHz |
| Memory Bandwidth | 250 GB/s | 288 GB/s |
| K20X System | K40 System | |
| CPU | 2 Intel Xeon E5-2677 (2.9GHz) | 2 Intel Xeon E5-2670 (2.6GHz) |
| GPU | NVIDIA Tesla K20Xm | NVIDIA Tesla K40m |
| OS | RHEL 6.2 (64bit) | RHEL 6.2 (64bit) |
| RAM | 128GB | 128GB |
| GPU driver | 319.72 | 319.58 |
| CUDA Toolkit | 5.5 | 5.5 |
| Host Compiler | GCC 4.4 | GCC 4.4 |
| Paths | Speedup (def. clock, single) | Speedup (def. clock, double) | Speedup (max. clock, single) | Speedup (max. clock, double) |
| 16K | 1.15x | 1.17x | 1.21x | 1.21x |
| 256K | 1.15x | 1.17x | 1.21x | 1.26x |
| 1024K | 1.15x | 1.18x | 1.22x | 1.28x |
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