The original has been using the W541 as a learning machine, but as long as the parameters are larger out-of-memory, depressed to death, so there will be an impulse to install a desktop. As a late-stage lazy cancer patient, TITAN X waited until 1080 and waited until 1080 TI. The model was also insufficient for memory from the optical GPU. Now, it is not enough to start buying and buying.
Reasons to purchaseIn the beginning, of course, it was to see how others got it. At the end, I saw that this article is more reliable: Link, then the summary is that the chassis must be large, so there is room for what to expand later.
The introduction of the installation article, first of all eyeing the thieves ship Air540, has been discontinued, is now Air740, yes, is the following goods.
US Corsair AIR740 black mid tower chassis (side penetration / high airflow / support ATX motherboard / power supply / water cooling / support 33CM graphics card) 829 yuan Corsair thermal design excellent chassis, the entire front panel are densely vented There are also a large number of heat sink fins on the top, which increases the heat dissipation area and supports the installation of 360 cold rows internally. In the tower shape, double chamber design, plate thickness 0.8mm, support ATX board, CPU heat sink limit height 170mm, maximum graphics length 33cm. Jingdong direct link to encyclopedia Later, I went online to watch various evaluations. The key is the water-cooled program. The only possible drawback is that many people say it is a vacuum cleaner. Who has no shortcomings, right? There is a dust filter on the line. Moreover, the current mainstream design of the chassis is this virtue. . . .
The rest will wait for a good price. . . .
After two months. . . . Until one day suddenly saw the goods online:
Tt (Thermaltake) Core X9 black horizontal chassis (layered design / large side through / 4 * U3 / internal modular / long graphics card / game water-cooled chassis) 819 yuan Jingdong direct link I X! so big! so big!
This cargo is not only big, but also one of my favorite features: Two power positions! In theory, I can even put two machines in. Isn't the chassis half price? buy!
Now that there is space, there is no limit to what is in there. So you have the following list:
Motherboard: ASUS X99-E WS/USB3.1
Asus/ASUS X99-E WS/USB 3.1 Workstation Motherboard Single 2011 Pin 4 Full Speed ​​Crossfire 3998 Yuan Lynx Select Direct Link CPU: E5-1620V4 (heatsink tower)
Intel Xeon CPU E5-1620V4 official version 3.5GHz 4 core 8 thread Taobao direct link 1490 yuan 
Kyushu Fengshen (DEEPCOOL) large frost tower CPU cooler (multi-platform / 6 heat pipe / intelligent temperature control / dual 12CM fan / with grease / mute) 179 yuan Jingdong direct link Memory: Samsung server memory 16G×4 (M393A2K40BB1-CRC0Q)
Samsung original 16G PC4-2400T DDR4 2400 ECC REG 16G fourth generation server memory 880 yuan Taobao direct links Hard Disk: Samsung 960 EVO 500G
Samsung (SAMSUNG) 960 EVO 500G M.2 NVMe SSD 1699 yuan Jingdong direct link Graphics: ASUS ROG STRIX-GTX1080TI-O11G-GAMING
ASUS ROG STRIX-GTX1080TI-O11G-GAMING 1569-1708MHz 11G/11100MHz GDDR5X PCI-E3.0 graphics card 6399 yuan Jingdong direct link Power Supply: EVGA 1000W G2
EVGA rated 1000w 1000 G2 power supply (80PLUS gold / full module / 10-year warranty / 14cm fan / ECO energy / full-day capacitance) 1039 yuan Jingdong direct link Appearance Gallery The next step is the blueprint, we feel the following:
The small phone is iphone6 ​​(non-plus)
Fortunately, I didn't buy 4 GPUs at once, otherwise I couldn't plug it in! ! ! ! ! !
If it is air-cooled, up to two, four must be water-cooled.
In fact, the big cool tower and the graphics card are almost sticking to it, and ASUS has a good backplane. I see the bare solder on the back of some other graphics cards. 
Looks like it is not that big, but who knows who to use (the mini route above is AC-66U, size we feel).
experience feelingsThere was an episode in the installation process: there was a memory that could not be identified. Asked the boss, let me rub with an eraser. . Wipe. . . .
In general, all aspects of this configuration are relatively balanced. Fans usually have very low speeds, and there is no problem with full load (except for fans, which are mainly because they are big enough and the air duct design is reasonable).
Next, on the software part, I also listed the pits I encountered and welcomed the exchange:
The first thing I took was the torch/pytorch genre.
Operating system UBUNTU 16.04 nothing to say. NVIDIA's driver is best not to install the latest 378, there is no need to use the online recommended PPA, the system can bring its own 375 with the latest CUDA / CUDNN. 378 The main reason for this is my conflict with x11vnc. Because the machine is too large to be placed in other rooms, there is no external display, directly want to control by remote VNC. This way I can't live or die with 378. I'll flash back when I log in to lightdm. I guess it's a low-level conflict. Switching to xfce24 is fine, but I'm not used to it. I also tried to drive with a dummy monitor, which seems to be not good, and the resolution is low, it is 13XX.
Also, if the startup of eclipse/pycharm is very slow, update libwebkit2gtk-4.0-37 2.14.3-0ubuntu016.04.1 to libwebkit2gtk-4.0-37-gtk2 2.14.5-0ubuntu0.16.04.1 or higher. Use this PPA:sudo add-apt-repository ppa:webkit-team.
If the eclipse starts the CPU is always 100%, follow the following:
Change eclipse.ini => Add -> launcher.GTK_version => 2 to --launcher.appendVmargs
to sum upFinally, I will pick up this list. In short, there is no short board. Learning machine this thing once there is a short board directly affects the overall performance.
Motherboard: There are very few on the market that can fully support 4 GPUs. With Asus's after-sale guarantee, I can't see other options. And this motherboard also supports Xeon processors and ECC memory, which is also very helpful. There are 8 slots, maximum support 128G memory.
CPU: The E5-1620 v4 was selected because it supports 40 PCI Express Lanes and also supports ECC memory. I7 only has a very high-end support 40, generally 28, it simply can not play the power of 4 GPU. It is estimated that we can support 40 to 3 to 4 times the price of 1620. There is also the best buy V4, this support 2400 memory, V3 only 2133. Finally must be the official version, ah, do not buy a QS/ES/beta or something like a few hundred pieces of cheap, too many bugs. I do not have too high requirements on the frequency, 3.5G can be. The pressure of data preprocessing is mainly in memory (to be large enough) and hard disk (read and write fast enough).
CPU fan: I first saw the anti-human, but there are comments that can not hold back the E5 (E5 is not overclocked maximum power 140W), so on the Great Frost Tower. Why is it cold on the water? Budget overrun. . . . . Wait until later on 4 GPUs to get it. Later found that this thing and memory is also a perfect match: If you buy the general non-ECC memory, the memory will be too high, the CPU can not press, this also worse 1CM. so close.
Memory: This is in accordance with the motherboard to choose, my demand is to first 64G, behind to be able to expand to 128G. In fact, the Internet can buy two kinds, one is the Samsung 16G I bought (32G's wrong model), there is magnesium. A certain treasure asked the boss that the factory's date of manufacture was too early (although it was cheaper) and finally chose Samsung. When buying, be sure to ask if it is an assembly bar (usually 7XX is it).
Hard disk: First Asus has M2 interface, this must be used, too much faster than SATA. Do not ask me not to buy Pro. . . Budget overrun. . .
Graphics card: In view of the future to be water-cooled, the beginning is to want to buy the public version, but also took a fancy to EVGA (this is going to JD buy, warranty is guaranteed), and later found the search water-cold head found ASUS 1080TI non-public also does not Less support, plus ASUS no invoice and warranty (as long as the mainland licensed, confirmed the phone), bought this OC (and non-OC same price).
Power supply: There are two power supply positions anyway. After that, you can buy a power supply serial connection on the 4 graphics cards. What is the G2? This is still cost-effective, this goods and 1200P2 energy efficiency is actually similar to 200W, the latter to the small 2000, expensive ah. Why not buy other brands is also the reason for the warranty. I learned this machine almost 24 * 7 boot, no warranty will be tragic. To add another sentence: my power suction port is up, not afraid of dust (the chassis below has a dust filter), mainly to guide the wind down.
Write it here first, then add it later.
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