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==GPU==
Using multiple GPUs adds a lot of complexity. It has a few benefits: possible speed ups if the network can be split up (and is big enough), able to train multiple networks at once (either copies of the same network or modified networks), more memory for huge batches. Tensorflow doesn't scale well for multiple GPUs, but could be used better (probably) to train multiple networks at once.
==RAM==Pros of multiple GPUs: *At least as much RAM as GPUs, probably twice that much Able to train multiple networks at once (2 * Number either copies of cards the same network or modified networks). Allows for running long experiments while running new ones* 11 GB [GTX 1080 Ti size]Possible speed ups if the network can be split up (and is big enough), but tensorflow is not great for this*RAM: Crucial DDR4 RDIMM [http://www.newegg.com/Product/Product.aspx?Item=9SIA0ZX39C3002], 2133Mhz , Registered More memory for huge batches (bufferednot sure if necessary) and ECC, comes in packs Cons of multiple GPUs:*Adds a lot of 4 x 32GBcomplexity.
==Storage==*M.2 Drives: Samsung 950 PRO -Series 512GB PCIe NVMe - M.2 Internal SSD 2-Inch MZ-V5P512BW [https://www.amazon.com/gp/product/B01639694M/ref=oh_aui_detailpage_o03_s01?ie=UTF8&psc=1]*Solid State Drives: Intel Solid-State Drive 750 Series SSDPEDMW400G4R5 PCI-Express 3.0 MLC - 400GB [https://www.amazon.com/gp/product/B00UHJJQAY/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1] or 800GB [https://www.amazon.com/gp/product/B013QP8XUE/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1]*Regular Hard drives: WD Red 3TB NAS Hard Disk Drive [https://www.amazon.com/gp/product/B008JJLW4M/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1] - 5400 RPM Class SATA 6 Gb/s 64MB Cache 3.5 Inch ==Misc.Parts==
Questions to ask*[https: * Approx//www.quora. datasetcom/batch size* Network card?* DVD drive?Can-I-double-the-PCIe-lanes-in-a-dual-CPU-motherboard This article] says that it may be necessary to get both CPUs to get all of the PCI lanes
==Single GPU Build==
[https://pcpartpicker.com/list/ZQjKf8 PC Partpicker build] missing a lot of pieces
no edit summary
{{Project|Has project output=Content|Has sponsor=McNair ProjectsCenter
|Has title=GPU Build
|Has owner=Oliver Chang,Kyran Adams
}}
==Motherboard/CPU/FanFinal Decision==*Not a huge deal, but used for data preparation*If using multiple GPUs, at least one core (two threads) per GPU*Should have enough PCIe slots*MotherboardsWe decided to clone the NVIDIA [[DIGITS DevBox]]: ASUS Z10PE-D16 [httphttps://wwwdeveloper.neweggnvidia.com/Product/Product.aspx?Item=N82E16813132257&Tpk=N82E16813132257]devbox To start with we are trying to use our existing ASUS Z10 server board, Dual LGA 2011 R3, DDR4 rather than switching to the Asus X99- Up to 32GB RDIMME WS workstation class motherboard, 16 slots*Chips: Intel Haswell Xeon e5-2620v3and rather than Four TITAN X GPUs, 6 core @ 2we've got a TITAN XP and a TITAN RTX.4ghz, 6x256k level 1 cache, 15mb level 2 cache, socket LGA 2011 Note that the Asus X99-v3 [https://wwwE WS is available from NewEgg for $500 now.amazon.com/gp/product/B00M1BUUMO/ref=oh_aui_detailpage_o04_s00?ie =UTF8&psc=1]*CPU Fans: Intel Thermal Solution Cooling Fan for E5-2600 Processors BXSTS200C [https://wwwSingle vs.amazon.com/gp/product/B007HJAM50/ref=oh_aui_detailpage_o03_s00?ieMulti GPU=UTF8&psc=1]
*[https://www.nvidia.com/en-us/geforce/products/10series/geforce-gtx-1080-ti/ GTX 1080 Ti Specs]
* Since we are using Tensorflow, it doesn't scale well to multiple GPUs for a single model
# If the network doesn't fit in the memory of one GPU (11 GB),
* [https://devtalk.nvidia.com/default/topic/743814/cuda-setup-and-installation/advice-on-single-vs-multi-gpu-system/ Advice on single vs multi-GPU system]
# Might want Want to get two graphics cards, one for development, one (crappy or onboard card) for operating system [https://stackoverflow.com/questions/21911560/how-can-i-set-one-nvidia-graphics-card-for-display-and-other-for-computingin-li]
*[https://stackoverflow.com/questions/37732196/tensorflow-difference-between-multi-gpus-and-distributed-tensorflow Different uses of multiple GPUs]
# Intra-model parallelism: If a model has long, independent computation paths, then you can split the model across multiple GPUs and have each compute a part of it. This requires careful understanding of the model and the computational dependencies.
====TL;DR====
==PSU= K80, NVLink ===*Some say 1.5x-2x wattage of NVLink can link between CPU and GPU+CPUfor increase in speed, some say GPU+but only with the CPUIBM POWER8+100W.*PSUsNVLink can link between GPU and GPU as a replacement for SLI with other CPUs, but this is not super relevant to tensorflow, even if trying to parallelize across one model.*[https: Corsair RM Series 850 Watt ATX/EPS 80PLUS Gold/www.quora.com/Which-Certified Power Supply GPU- CPis-9020056better-NA RM850 for-Deep-Learning-GTX-1080-or-Tesla-K80 This source] says to get the 1080 because the K80 is basically two K40s, which have less memory bandwidth than the 1080. [https://www.amazonreddit.com/gpr/deeplearning/comments/product5mc7s6/B00EB7UIXMperformance_difference_between_nvidia_k80_and_gtx/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1This source] agrees.
*Cases: Rosewill 1.0 mm Thickness 4U Rackmount Server Chassis, Black Metal/Steel RSV-L4000[https://www.amazon.com/gp/product/B0056OUTBK/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1]
*Consider this case: Corsair Carbide Series Air 540 High Airflow ATX Cube Case [https://www.amazon.com/dp/B00D6GINF4/ref=twister_B00JRYFVAO?_encoding=UTF8&psc=1]
*DVDRW (Needed?): Asus 24x DVD-RW Serial-ATA Internal OEM Optical Drive DRW-24B1ST [http://www.amazon.com/Asus-Serial-ATA-Internal-Optical-DRW-24B1ST/dp/B0033Z2BAQ/ref=sr_1_2?s=pc&ie=UTF8&qid=1452399113&sr=1-2&keywords=dvdrw]
*Keyboard and Mouse: AmazonBasics Wired Keyboard and Wired Mouse Bundle Pack [http://www.amazon.com/AmazonBasics-Wired-Keyboard-Mouse-Bundle/dp/B00B7GV802/ref=sr_1_2?s=pc&rps=1&ie=UTF8&qid=1452402108&sr=1-2&keywords=keyboard+and+mouse&refinements=p_72%3A1248879011%2Cp_85%3A2470955011]
* Optical drive: HP - DVD1265I DVD/CD Writer [https://www.newegg.com/Product/Product.aspx?Item=N82E16827140098&ignorebbr=1&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=]
==Other Builds/Guides==
* [https://news.ycombinator.com/item?id=14438472 Deep learning box for $1700] (links to https://blog.slavv.com/the-1700-great-deep-learning-box-assembly-setup-and-benchmarks-148c5ebe6415Deep learning box for $1700] ([https://news.ycombinator.com/item?id=14438472 Discussion])
* [http://timdettmers.com/2015/03/09/deep-learning-hardware-guide/ A Full Hardware Guide to Deep Learning]
* [https://www.oreilly.com/learning/build-a-super-fast-deep-learning-machine-for-under-1000 Cheap build]
* [https://medium.com/@SocraticDatum/getting-started-with-gpu-driven-deep-learning-part-1-building-a-machine-d24a3ed1ab1e How to build a GPU deep learning machine]
* [https://www.slideshare.net/PetteriTeikariPhD/deep-learning-workstation Deep Learning Computer Build] useful tips, long
* [https://www.tooploox.com/blog/deep-learning-with-gpu Another box]
* [http://graphific.github.io/posts/building-a-deep-learning-dream-machine/ Expensive deep learning box]
==Double GPU Server Build==
[https://pcpartpicker.com/user/kyranadams/saved/gDzFdC PC Partpicker build]
==Double GPU Build==
[https://pcpartpicker.com/user/kyranadams/saved/ykK7hM PC Partpicker build]
===Motherboard===
*Needs enough PCIe slots to support both GPUs and other units
*Motherboards: MSI - Z170A GAMING M7 ATX LGA1151 Motherboard [https://www.newegg.com/Product/Product.aspx?Item=9SIA85V4SC7911&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=], LGA 1151, 3x PCIe 3.0 x 16, 4 x PCIe 3.0 x 1, 6 x SATA 6GB/s, also used in [https://medium.com/@SocraticDatum/getting-started-with-gpu-driven-deep-learning-part-1-building-a-machine-d24a3ed1ab1e this build]
===CPU/Fan===
*At least one core (two threads) per GPU
*Chips: Intel - Core i7-6700 3.4GHz Quad-Core Processor [https://www.amazon.com/dp/B0136JONG8/?tag=pcpapi-20]
*CPU Fans: Cooler Master - Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler [https://www.newegg.com/Product/Product.aspx?Item=N82E16835103099&ignorebbr=1&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=]
*Buying this fan because it's very cheap for the reviews it got, and the stock cooler for the CPU has had mixed reviews
===GPU===
* 2x GTX 1080 Ti [https://www.newegg.com/Product/Product.aspx?Item=N82E16814487338&ignorebbr=1&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=]
* Integrated graphics on CPU: Intel HD Graphics 530
===RAM===
*At least as much RAM as GPUs (2 * 11 GB [GTX 1080 Ti size] = 22 GB, so 32GB)
*Does not have to be fast for deep learning: "CPU-RAM-to-GPU-RAM is the true bottleneck – this step makes use of direct memory access (DMA). As quoted above, the memory bandwidth for my RAM modules are 51.2GB/s, but the DMA bandwidth is only 12GB/s!"[http://timdettmers.com/2015/03/09/deep-learning-hardware-guide/]
* Crucial - 32GB (2 x 16GB) DDR4-2133 Memory [https://www.newegg.com/Product/Product.aspx?Item=9SIA8PV5HF1514&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=], SATA 6 GB/s interface
* If not enough, should be able to extend this by buying two more cards
===PSU===
*Some say PSU should be 1.5x-2x wattage of system, some say wattage+100W
*PSU: EVGA - SuperNOVA G2 1000W 80+ Gold Certified Fully-Modular ATX Power Supply [https://www.newegg.com/Product/Product.aspx?Item=N82E16817438010&ignorebbr=1&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=]
===Storage===
*SSD should be fast enough, no need for M.2 [http://timdettmers.com/2015/03/09/deep-learning-hardware-guide]
*SSD: Samsung - 850 EVO-Series 500GB 2.5" Solid State Drive [https://www.newegg.com/Product/Product.aspx?Item=N82E16820147373&ignorebbr=1&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=]
*HDD: Seagate - Barracuda 3TB 3.5" 7200RPM Internal Hard Drive [https://www.newegg.com/Product/Product.aspx?Item=9SIADG25GT7889&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=]
===Other things to consider===
* Water cooling? [http://timdettmers.com/2015/03/09/deep-learning-hardware-guide/ this] has a good section on cooling
* Case is not rack mounted
==Software tips==
* Setting up Ubuntu and Docker [https://medium.com/@SocraticDatum/getting-started-with-gpu-driven-deep-learning-part-2-environment-setup-fd1947aab29]
