OEM as in HP / Dell / Lenovo?
Or do you mean prebuilts such as Cybertron PC with A320 chipset ? (They are at Best Buy , Walmart, Newegg, & Amazon)
There's also CyberpowerPC, ibuypower. In Microcenter they have Powerspec brand prebuilts.
I believe CyberpowerPC is running many promos right now such that you can get a X370 Killer SLI + Ryzen 7 1700 system with watercooling for about $1100. Not sure if it expired but I priced it out myself vs building it the other day http://www.overclock.net/lists/display/view/id/6710985Easter special (Click to show)
It seems pricier a bit today:
Configuration#: 1JN01L (http://www.cyberpowerpc.com/saved/1JN01L
BLKFRISALE1: CYBERPOWERPC Skorpion K1 RGB Mechanical Gaming Keyboard w/ Kontact Blue Switches and Programmable RGB LED Lighting [+5]
BLKFRISALE2: TP-LINK 802.11AC Archer T2U AC600 Wireless Dual Band, 2.4GHz 150Mbps/5Ghz 433Mbps USB Adapter [+5]
BLKFRISALE3: RAZER Abyssus Black Wired Optical Gaming Mouse + Goliathus Control Speed Gaming MousePad Bundle [+5]
CAS: IN WIN 303 Mid Tower High Air Flow Gaming Case w/ Tempered Glass Full Size Window [+25]
CD: None [-13]
CPU: AMD Ryzen 5 1600 3.2GHz [3.6GHz Turbo] Six-Core 16MB L3 Cache 95W Processor [+76]
CS_FAN: Default case fans
FAN: Corsair Hydro Series H60 120mm Liquid CPU Cooling System w/ Copper Cold Plate (Single Standard 120MM Fan)
HDD: 240GB WD Green SATA-III 6.0Gb/s SSD - 540MB/s Read and 465MB/s Write [+13]
IUSB: Built-in USB 2.0 Ports
KEYBOARD: None [-5]
MEMORY: 16GB (8GBx2) DDR4/2400MHz Dual Channel Memory (Corsair or Major Brand)
MOTHERBOARD: ASRock X370 Killer SLI AM4 ATX w/ RGB, Intel LAN, 2 PCIe x16, 4 PCIe x1, 6 SATA3, 2 M.2 SATA/PCIe [+36]
MOUSE: None [-3]
NETWORK: Onboard Gigabit LAN Network
OS: Windows 10 Home (64-bit Edition)
OVERCLOCK: No Overclocking
POWERSUPPLY: 850 Watts - EVGA 850W GQ 80 Plus Gold Power Supply [+25]
RUSH: Standard processing time: ship within 5 to 10 Business Days
SERVICE: 3 Years FREE Service Plan (INCLUDES LABOR AND LIFETIME TECHNICAL SUPPORT)
SOUND: HIGH DEFINITION ON-BOARD 7.1 AUDIO
VIDEO: AMD Radeon RX 470 4GB GDDR5 Video Card (Single Card)
WARRANTY: STANDARD WARRANTY: 1 Year Parts WARRANTY
WTV: None_PRICE: (+948)
Normally the AsRock X370 Killer SLI is not as attractively priced, this configuration has it less than a B350 Gaming 3. They charge $30ish less for AsRock B350 boards so it isn't worth the minor savings.
It's only worth it if you order the XSPC kit for an additional $50 or so since you will save time setting up the loop.
On the high end you have builders such as Maingear , Origin , Digital Storm, Falcon Northwest, and Velocity Micro / Xotic PC / Xidax.
$900-1100 AMD Ryzen 7 desktops are price competitive to ~$1000 Intel i7-7700k systems but the i5-7600k systems are roughly $700-800 (Ryzen 5 1400 and 1500X systems look to be running ~$700 while Ryzen 5 1600 systems are looking to be more around $900)Edited by AlphaC - 4/14/17 at 8:56am