Difference between revisions of "Hardware Benchmarking"
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*Similar to the CPU results, decreasing the model cell size increases the variability in what runtime you'll get per CUDA cores | *Similar to the CPU results, decreasing the model cell size increases the variability in what runtime you'll get per CUDA cores | ||
*Unlike the CPU results, the variability in runtimes to cards is greater than the change in model cell size. Thus, it could be argued that the runtime of your GPU model is more dependent on the type of card you have than the runtime of your CPU model is on the processor frequency. | *Unlike the CPU results, the variability in runtimes to cards is greater than the change in model cell size. Thus, it could be argued that the runtime of your GPU model is more dependent on the type of card you have than the runtime of your CPU model is on the processor frequency. | ||
| − | *From the preliminary results, the NVIDIA GTX 980 seems a crowd favorite and performs well | + | *From the preliminary results, the NVIDIA GTX 980 seems a crowd favorite and performs well. It is likely that as model size increases that the Titan Black and K6000 with 2880 cores will result in faster runtimes. |
[[File:GPUvsCUDA3.png | 800px ]] | [[File:GPUvsCUDA3.png | 800px ]] | ||
Revision as of 14:28, 20 June 2016
Introduction
We frequently get asked, "What is the minimum or recommended hardware to use for TUFLOW modelling". This is always a tricky question, as the answer depends on the type and size of the models you are going to be run. For a small model, TUFLOW should run on any modern PC or laptop that is capable of running Windows XP or later. However, for large models there may be requirements for a hefty computer running a 64 bit version of Windows.
The tables below showing computer specifications and model run-time should help you compare systems.
In this page we outline a hardware benchmark model which is available to download from the TUFLOW website the model can be simulated without a TUFLOW dongle (license). This makes it easy to benchmark on a range of computers and the results are complied below.
We have typically found that the CPU speed is the largest influence on TUFLOW runtimes, with the RAM speed also having an influence for large models. In order to quantify this we are compiling the computational times required for a range of different machines.
Benchmark Model
The benchmark model is based on a “challenge” issued prior to the 2012 Flood Managers Association (FMA) Conference in Sacramento, USA. There is more information on the model setup and purpose in the FMA challenge model introduction.
This hardware benchmark is based on the second challenge which involves a coastal river in flood with two ocean outlets. The model has been modified slightly (mainly in terms of the outputs). It is setup to run use both the TUFLOW "classic" (CPU) and TUFLOW GPU (graphics card) solvers for a range of cell sizes.
Cell sizes
| Cell Size (m) | Number of cells |
|---|---|
| 30 | 80,887 |
| 15 | 323,536 |
| 10 (GPU only) | 727,865 |
The model runs for three days of simulation time (72 hours). The approximate run time for the 30m model on the CPU is likely to be ~20min and for the 15m version approximately 4 hours. Given the runtime for the CPU model at 10m resolution is likely to be > 12 hours, this is skipped in the benchmark (this can also be run with a licence).
To participate in the benchmark, please follow the steps below:
- Download the model from http://www.tuflow.com/Download/TUFLOW/Benchmark_Models/FMA2_GPU_CPU_Benchmark.zip
- Extract the model on a local drive of the computer you would like to benchmark.
- Navigate to the TUFLOW\runs\ folder and run the "Run_Benchmark.bat" file. This checks if you are running a 32 or 64 bit system and then runs the benchmark. This also generates some output files that contain more information on the processor, memory and GPU that you are using.
- Email the _ TUFLOW Simulations.log, cpu.txt, ram.txt and GPU.txt files to support@tuflow.com and we will includes these in the results tables below.
A nVidia graphics card that is CUDA compatible is required to run the GPU model . For more information on this please see the release notes.
The computer information is determined in the batch file using the wmic and dxdiag commands.
CPU Results
The following table summarises the runtimes for a range of computers. More will be added when additional results are obtained. The table is ordered based on the combined 30m and 15m runtimes, with the fastest computers at the top of the table.
Runtimes for CPU benchmarks
| Processor Name | Processor Frequency (GHz)** | RAM size (GB) | RAM frequency (MHz) | Runtime 30m (mins) | Runtime 15m (mins) | Runtime 10m (mins) | Runtime Combined (mins) | System Name |
|---|---|---|---|---|---|---|---|---|
| Intel(R) Core(TM) i7-6700K CPU @ 4.70GHz | 4.7 | 64 | 2500 | 14.92 | 138.72 | N/A | 153.64 | ZDO |
| Intel(R) Core(TM) i7-6700K CPU @ 4.70GHz | 4 | 64 | 2500 | 15.2 | 138.9 | N/A | 154.1 | RLO |
| Intel(R) Core(TM) i7-6700K CPU @ 4.50GHz | 4.5 | 64 | 2800 | 15.42 | 142.28 | N/A | 157.70 | CRY1 |
| Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz | 2.7 | 32 | 2133 | 20.7 | 190.55 | N/A | 211.25 | DDU |
| Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz | 2.7 | 32 | 2133 | 21.2 | 193.2 | N/A | 214.4 | MG1 |
| Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz | 2.5 | 16 | 1600 | 23.4 | 211.98 | N/A | 235.38 | GHA |
| Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz | 4 | 32 | 1333 | 20.5 | 220.4 | N/A | 240.9 | BRA |
| Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz | 2.4 | 16 | 1600 | 25.47 | 221.92 | N/A | 247.39 | NBO |
| Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz | 3.3 | 64 | 2133 | 21.08 | 239.73 | N/A | 260.81 | DAN |
| Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz | 4 | 16 | 1600 | 22.68 | 244.25 | N/A | 266.93 | RH1 |
| Intel(R) Core(TM) i7-5960 XCPU @ 3.00GHz | 3 | 64 | 2133 | 21.23 | 247.55 | N/A | 268.78 | MON |
| Intel(R) Core(TM) i7-5820K CPU @ 4.30GHz | 4.3 | 64 | 2800 | 23.8 | 251.2 | N/A | 275 | CRY2 |
| Intel(R) Core(TM) i5-4670 CPU @ 3.40GHz | 3.4 | 8 | 1600 | 23.9 | 256.7 | N/A | 280.6 | PAR |
| AMD FX(tm)-9590 Eight-Core Processor @ 4.70GHz | 4.7 | 16 | 1866 | 32.4 | 249.07 | N/A | 281.47 | DDH3 |
| AMD FX(tm)-9590 Eight-Core Processor @ 4.70GHz | 4.7 | 16 | 1333 | 33.63 | 258.88 | N/A | 292.51 | DDH1 |
| Intel(R) Xeon(R) CPU E5-1650 v3 @ 3.50GHz | 3.5 | 32 | 2133 | 23.6 | 269.25 | N/A | 292.85 | RH2 |
| Intel(R) Xeon(R) CPU E5-1650 v3 @ 3.50GHz | 3.5 | 128 | 2133 | 24.58 | 277.1 | N/A | 301.63 | PTR |
| Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz | 3.6 | 32 | 1600 | 25.8 | 268.3 | N/A | 294.12 | CCA |
| Intel(R) Core(TM) i7-4810MQ CPU @ 2.80GHz | 2.8 | 8 | 1600 | 26.9 | 284.1 | N/A | 311.05 | EUK |
| Intel(R) Core(TM) i5-4570S CPU @ 2.90GHz | 2.9 | 8 | 1600 | 27.65 | 283.71 | N/A | 311.36 | LM2 |
| Intel(R) Xeon(R) CPU E5-1620 v3 @ 3.50GHz | 3.5 | 32 | 2133 | 26.1 | 285.3 | N/A | 311.4 | MG2 |
| Intel(R) Xeon(R) CPU E5-2687W v3 @ 3.10GHz | 3.1 | 16 | 2133 | 24.93 | 291.7 | N/A | 316.63 | MBA |
| Intel(R) Xeon(R) CPU E5-1650 v2 @ 3.50GHz | 3.5 | 32 | 1600 | 28.5 | 285.9 | N/A | 314.4 | RH3 |
| Intel(R) Core(TM) i7-3770 CPU v3 @ 3.40GHz | 3.4 | 16 | 1600 | 29.68 | 296.2 | N/A | 325.88 | DDH2 |
| Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz | 3.2 | 16 | 1600 | 31.1 | 297.43 | N/A | 328.53 | RH3 |
| Intel(R) Core(TM) i7-3740QM CPU @ 2.70GHz | 2.7 | 16 | 1600 | 31.7 | 301.5 | N/A | 333.2 | MJS |
| Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz | 2.7 | 32 | 1600 | 29.1 | 308.12 | N/A | 337.22 | JT1 |
| Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz | 3.3 | 64 | 2133 | 29.2 | 317.1 | N/A | 346.3 | EOG |
| Intel(R) Xeon(R) CPU E5-1620 v2 CPU @ 3.70GHz | 3.7 | 16 | 1866 | 31.18 | 319.67 | N/A | 350.85 | TBE |
| Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz | 3.3 | 64 | 2133 | 33.08 | 317.86 | N/A | 350.94 | JAC |
| Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz | 3.4 | 16 | 3401 | 35.6 | 320.2 | N/A | 355.8 | UOV |
| Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz | 3.4 | 16 | 1333 | 35.85 | 320.2 | N/A | 356.05 | MMO |
| Intel(R) Xeon(R) CPU E5-1630 v3 @ 3.70GHz | 3.7 | 32 | 2133 | 29.2 | 327.3 | N/A | 356.47 | NCH |
| Intel(R) Xeon(R) CPU E5-2670 V3 @ 2.30GHz | 2.3 | 96 | 2133 | 28.4 | 333.35 | N/A | 361.75 | RK2 |
| Intel(R) Xeon(R) CPU E3-1240 V2 @ 3.40GHz | 3.4 | 32 | 1600 | 39.0 | 334.4 | N/A | 373.4 | XEO |
| Intel(R) Xeon(R) CPU E5-1620 0 @ 3.60GHz | 3.6 | 32 | 1600 | 44.18 | 335.82 | N/A | 380.00 | DCO |
| Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.80GHz | 2.8 | 8 | 800 | 47.43 | 343.23 | N/A | 390.66 | AJI |
| Intel(R) Core(TM) i5-4300U CPU @ 3.30GHz | 1.9 | 8 | 1600 | 35.63 | 365.81 | N/A | 393.98 | LP1 |
| Intel(R) Xeon(R) W3565 CPU @ 3.20GHz | 3.2 | 12 | 1333 | 37.88 | 356.1 | N/A | 401.44 | LP2 |
| 2 x Intel(R) Xeon(R) X5680 CPU @ 3.33GHz | 3.3 | 64 | 1333 | 40.5 | 368.9 | N/A | 409.35 | WMD |
| Intel(R) Core(TM) i7-2670QM CPU @ 2.20GHz | 2.2 | 16 | 1333 | 40.3 | 375.33 | N/A | 415.63 | FFN |
| 2 x Intel(R) Xeon(R) CPU E5-2643 V3 @ 3.40GHz | 3.4 | 128 | 2133 | 40.5 | 377.1 | N/A | 418.14 | XYG |
| Intel(R) Xeon(R) E5-2630 CPU @ 2.30GHz | 2.3 | 64 | 1333 | 40.1 | 393.92 | N/A | 434.02 | HUH |
| Intel(R) Xeon(R) E5-1603 0 CPU @ 2.80GHz | 2.8 | 16 | 1600 | 40.85 | 395.81 | N/A | 436.66 | LMD |
| 2 x Intel(R) Xeon(R) CPU E5-2630 0 @ 2.80GHz | 2.3 | 38 | 1333 | 41.3 | 401.12 | N/A | 444.42 | RH5 |
| Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz | 2.7 | 8 | 1600 | 39.5 | 420.7 | N/A | 460.2 | HUK |
| Intel(R) Core(TM) i7-920 CPU @ 2.67GHz | 2.67 | 12 | 1066 | 45.05 | 420.7 | N/A | 465.75 | REJ |
| Intel(R) Xeon(R) CPU W3505 @ 2.53GHz | 2.53 | 4 | 1333 | 49.12 | 453.5 | N/A | 502.62 | JT2 |
| Intel(R) Xeon(R) CPU X5650 @ 2.67GHz | 2.67 | 4 | 64.28 | 669.2 | N/A | 733.48 | ADU |
GPU Results
The following table summarises the runtimes for a range of computers. More will be added when additional results are obtained. The table is ordered based on the combined 30m, 15m and 10m runtimes with the fastest computers at the top of the table.
The GPU benchmark only uses a single GPU card. TUFLOW GPU can be run across multiple nVidia GPU devices. However, the benefits of these are typically more noticeable for larger models with more than 1 million cells. A number of additional benmarking tests have been completed on a 2m model and multiple GPU cards.
Runtimes for GPU benchmarks
| Processor Name | Graphic Card | GPU RAM (GB) | Number of CUDA Cores* | Runtime 30m (mins) | Runtime 15m (mins) | Runtime 10m (mins) | Combined Runtime (mins) | System Name |
|---|---|---|---|---|---|---|---|---|
| Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz | NVIDIA GeForce GTX 1080 | 8 | 2,560 | 1.2 | 5.6 | 16.5 | 23.3 | RLO |
| Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz | NVIDIA GeForce GTX 980 Ti | 6 | 2,816 | 1.3 | 6.03 | 17.36 | 24.69 | ARN |
| Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz | NVIDIA GeForce GTX TITAN X | 12 | 3,072 | 1.3 | 6.22 | 18.1 | 25.62 | DAN |
| Intel(R) Xeon(R) CPU E5-1630 v3 @ 3.70GHz | NVIDIA GeForce GTX TITAN X | 12 | 3,072 | 1.7 | 7.03 | 19.62 | 28.35 | NCH |
| Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz | NVIDIA GeForce GTX 980 | 4 | 2,048 | 1.4 | 7.8 | 24.4 | 33.5 | BRA |
| Intel(R) Xeon(R) CPU E5-1650 v3 @ 3.50GHz | NVIDIA GeForce GTX 980 | 4 | 2,048 | 1.77 | 8.42 | 25.35 | 35.54 | PTR |
| Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz | NVIDIA GeForce GTX 980 | 4 | 2,048 | 1.8 | 8.7 | 25.2 | 35.7 | EOG |
| Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz | NVIDIA GeForce GTX 980 | 4 | 2,048 | 1.73 | 9.05 | 24.95 | 35.73 | JAC |
| Intel(R) Xeon(R) CPU E5-2670 V3 @ 2.30GHz | NVIDIA GeForce GTX 980 | 4 | 2048 | 1.95 | 8.76 | 25.16 | 35.84 | RK2 |
| Intel(R) Xeon(R) CPU E5-1620 0 @ 3.60GHz | NVIDIA GeForce GTX TITAN Black | 4 | 2880 | 2.05 | 10.56 | 30.78 | 43.39 | DCO |
| 2 x Intel(R) Xeon(R) CPU E5-2643 V3 @ 3.40GHz | NVIDIA Quadro K6000 | 4 | 2880 | 2.63 | 11.45 | 32.23 | 46.31 | XYG |
| Intel(R) Core(TM) i5-4670 CPU @ 3.40GHz | NVIDIA GeForce GTX 770 | 2 | 1,536 | 1.9 | 11.5 | 36.8 | 50.2 | PAR |
| Intel(R) Xeon(R) E5-2630 CPU @ 2.30GHz | NVIDIA GeForce GTX 680 | 2 | 1536 | 2.35 | 12.95 | 41.5 | 56.8 | HUH |
| Intel(R) Xeon(R) CPU E3-1240 V2 @ 3.40GHz | NVIDIA GeForce GTX 690 | 2 | 1,536 | 2.3 | 13.7 | 43.6 | 59.6 | XEO |
| Intel(R) Xeon(R) CPU E5-2687W v3 @ 3.10GHz | NVIDIA Tesla K20c | 5 | 2,496 | 2.13 | 13.82 | 44.47 | 60.42 | MBA |
| Intel(R) Xeon(R) CPU E5-1620 v3 @ 3.50GHz | NVIDIA Quadro K4200 | 4 | 1,344 | 2.73 | 16.38 | 54.87 | 73.98 | MG2 |
| Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz | NVIDIA Quadro K4200 | 4 | 1,344 | 2.5 | 16.8 | 55.1 | 74.3 | CCA |
| 2 x Intel(R) Xeon(R) CPU X5680 @ 3.33GHz | NVIDIA Tesla C2075 | 4 | 448 | 3.4 | 19.1 | 58.4 | 80.85 | WMD |
| Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz | NVIDIA GeForce GTX 750 Ti | 2 | 640 | 2.93 | 18.88 | 60.63 | 82.44 | DDH2 |
| Intel(R) Core(TM) i7-5960 XCPU @ 3.00GHz | NVIDIA GeForce GTX 750 Ti | 2 | 640 | 2.93 | 18.9 | 61.48 | 83.31 | MON |
| Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz | NVIDIA GeForce GTX 750 Ti | 2 | 640 | 4.78 | 18.555 | 60.4 | 83.76 | RH1 |
| AMD FX(tm)-9590 Eight-Core Processor @ 4.70GHz | NVIDIA GeForce GTX 750 | 1 | 512 | 3.8 | 22.68 | 72.22 | 98.7 | DDH1 |
| Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz | NVIDIA Quadro M1000M | 2 | 512 | 4.13 | 23.93 | 75.33 | 103.39 | MG1 |
| Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz | NVIDIA Quadro M1000M | 2 | 512 | 4.18 | 24.3 | 75.2 | 103.68 | DDU |
| Intel(R) Core(TM) 2 Quad CPU Q9550 @ 2.80GHz | NVIDIA Quadro 4000 | 4 | 768 | 5.2 | 32.23 | 103.99 | 141.24 | AJI |
| Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz | NVIDIA Quadro K3100M | 4 | 768 | 5.2 | 37.42 | 107.33 | 149.95 | JT1 |
| Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz | NVIDIA Quadro K2000 | 2 | 384 | 6.8 | 46.7 | 151.8 | 205.3 | UOV |
| Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz | NVIDIA Quadro K2000 | 2 | 384 | 6.83 | 46.07 | 151.83 | 204.73 | MMO |
| Intel(R) Core(TM) i7-2670QM CPU @ 2.20GHz | NVIDIA GeForce GTX 560M | 2 | 192 | 6.78 | 46.8 | 154.72 | 208.3 | FFN |
| ntel(R) Core(TM) i7-5820K CPU @ 3.30GHz | NVIDIA GeForce GT 730 | 2 | 384 | 12.37 | 87.77 | 293.55 | 393.69 | CRY2 |
| Intel(R) Core(TM) i7-3740QM CPU @ 2.70GHz | NVIDIA NVS 5200M | 1 | 96 | 12.7 | 89.3 | 303.2 | 405.2 | MJS |
| Intel(R) Core(TM) i7-6700K CPU 4.70GHz | NVIDIA GeForce GT 730 | 2 | 384 | 12.62 | 93.68 | 316.12 | 422.42 | ZDO |
| Intel(R) Xeon(R) CPU E5-1620 v2 CPU @ 3.70GHz | NVIDIA Quadro K600 | 1 | 192 | 14.2 | 101.67 | 338.4 | 454.27 | TBE |
* it is noted that the number of CUDA cores is not provided as an output from the '''dxdiag''' command and this information has been sourced from the nvidia website. ** The output cpu.txt only provides the 'out of the box' processor speed. If you have overclocked your cpu, then please send these details through to TUFLOW Support so we can add the correct clock speed.
Discussion
The below preliminary results of the benchmark models have been based on the data submitted so far.
Preliminary CPU Results
The below comparison of the CPU results presents a few interesting points for discussion:
- The runtimes for both models display similar variance as a percentage of the total time across hardware capabilities (32% and 30% relative standard deviation for the 30m and 15m models respectively).
- The runtimes for both the 15m and 30m model show variance largely linked to CPU frequency but not totally. The results are dispersed, perhaps reflecting chip variability, chipset or other systems factors.
- The difference in runtime between the fastest and slowest hardware (~430-480%) is much less than the difference in average runtime for the 30m and 15m models (980%). Thus, nothing can improve your model runtime like efficient model design!
Preliminary GPU Results
- Similar to the CPU results, decreasing the model cell size increases the variability in what runtime you'll get per CUDA cores
- Unlike the CPU results, the variability in runtimes to cards is greater than the change in model cell size. Thus, it could be argued that the runtime of your GPU model is more dependent on the type of card you have than the runtime of your CPU model is on the processor frequency.
- From the preliminary results, the NVIDIA GTX 980 seems a crowd favorite and performs well. It is likely that as model size increases that the Titan Black and K6000 with 2880 cores will result in faster runtimes.
Average reduction in Runtime from CPU to GPU
When comparing the CPU and GPU runtimes for the 15 and 30 m models on average the following runtime improvments are achieved:
- 11.0x reduction in runtime for the 30m model (80,000 cells)
- 20.4x reduction in runtime for the 15m model (325,000 cells)
These results highlight the relationship between GPU/CPU runtime reduction relative the number of the cells in a model. The reduction ratio increases with the size of the model (number of cells). Up to a 100x reduction in runtime have been recorded using a 18,000,000 cell GPU model refer Large Model GPU Benchmarking.
800px
Large Model GPU Benchmarking
In addition to the benchmarking completed on the 10m, 15m and 30m models, a number of tests were completed by running the FMA Demo Model 2 at a 2m resolution on up to four GPU cards.The 2m model has approximately 18.2 M cells and was simulated for the following test cases:
The five runs detailed above were also re-run on the 10m grid.
Explanation of Tabulated Results
The large model benchmarking results are summarised in the below table. The contents of each column is detailed as follows:
Runtimes for GPU benchmarks
| Run ID | 2m Runtime (min) | 10m Runtime (min) | 2m Runtime (realtime (mins) / simtime (hour)) | 10m Runtime (realtime (mins) / simtime (hour)) | 2m CPU/GPU Speedup Factor | 10m CPU/GPU Speedup Factor | 2m MulitGPU Speedup Factor | 10m MulitGPU Speedup Factor |
|---|---|---|---|---|---|---|---|---|
| 1 x NVIDIA Geforce GTX 680 GPU | 513.2 | 4.6 | 51.3 | 0.5 | 44 | 18 | 1 | 1 |
| 2 x NVIDIA Geforce GTX 680 GPU | 318.5 | 3.5 | 31.8 | 0.01 | 71 | 23 | 1.6 | 1.3 |
| 3 x NVIDIA Geforce GTX 680 GPU | 230.6 | 3.2 | 23.1 | 0.01 | 98 | 26 | 2.2 | 1.4 |
| 4 x NVIDIA Geforce GTX 680 GPU | 223.7 | 3.6 | 22.4 | 0.01 | 101 | 23 | 2.3 | 1.3 |
| CPU Only | 23478.3 | 81.5 | 2347.8 | 0.14 | NA | NA | NA | NA |
Discussion
The results of the large model GPU testing indicate:
If you have done any testing on much larger models, then we would love to hear how you have gone!!! Please send in details to support@tuflow.com.
General Comments on GPU Model Memory Requirements
Without infiltration, you can model about 15 million cells per GB of GPU RAM, with infiltration it is about 12 million cells per GB. A card with 6 GB of RAM allows about 75 million cells. However, as the pre and post processing is handled by the TUFLOW engine, such a model would also require significant amounts of motherboard RAM as well. You can also run models across multiple GPU cards allowing for even larger models to be simulated. For example it is possible to run 180 million cells with infiltration losses over four GTX680 cards (4 GB each).
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