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For comparison, my old rig:
CPU: Core i7-860
Motherboard: Asus P7P55D
GPU: Radeon HD 5850
SSD: 240 GB Seagate 600
Memory: 4 GB (2 x 2 GB) 1600 MHz DDR3 9-9-9-24
Power supply: Enermax 82+ Pro 525 W
UPS: CyberPower CP1350AVRLCD
Case: Antec Three Hundred
Monitors: 2x 19", 1280x1024, one from Dell, the other Hanns-G
I replaced the SSD (originally I had a 120 GB OCZ Agility) in late 2013, and the GPU cooler in 2010, but the rest of the parts date to 2009 or older. But the computer has crashed three times in total in nearly six years, all of which were fine after a quick reboot, so I'm happy with the reliability.
What's really driving the upgrade is monitors. I want more and bigger monitors. I thought 1920x1080 was a stupid resolution, so I skipped it. I'm not meaningfully budget limited, so I can get what I want, whatever it costs. I just ordered three of these:
That's the Asus MG279Q. It supports adaptive sync, and hence AMD FreeSync. It sports a 2560x1440 resolution, 27" size, 144 Hz refresh rate, IPS panel, DisplayPort 1.2, and pivot, among other things. FreeSync will cap the refresh rate at 90 Hz. I'm planning on putting them in portrait mode, for a combined resolution of 4320x2560.
I'd normally wait and buy everything at once, but there's only one monitor on the market that does everything I want, and it's 10% off right now with a promo code, so I decided to grab it.
For the rest of the computer, some parts are subject to change:
CPU: Core i7-6700K
Motherboard: not sure yet, but possibly this:
That might change depending on what else shows up.
Memory: 16 GB (2 x 8 GB) DDR4. If I had to buy right now, it would be this:
I'm going to get something among the cheaper memory modules that meets the specs I want.
SSD: Something in the 500 GB range that I trust to be reliable. Likely this, though that could change if prices do:
Power supply: Seasonic Snow Silent 750 W
Because it's the best consumer power supply there is and I don't want to mess around with reliability.
UPS: CyberPower CP1350PFCLCD
The last UPS I got from them has worked flawlessly for six years now, through several dozen power events. I don't know how long a UPS can be expected to be reliable, but it's not something that I want to risk.
Operating system: Windows 10 Home full
It's an extra $20 to get the full version, so I can move it to another computer if the need strikes. And I get it on a USB stick, which is a definite plus. Which leads to:
Optical drive: none
It's been years since I used the optical drive in my current computer. If I need one at some point, I can grab it from the old computer.
Internal hard drive: none
Because hard drives are backup devices and I don't have ridiculous amounts of junk data to store. Speaking of which:
External hard drive: not sure yet, but something USB 3.0 in the ballpark of 500 GB-1 TB. A complete image of my SSD periodically makes a nice supplement to daily incremental backup to USB flash drives.
Video card: Probably a Radeon R9 Fury X, though it's out of stock at the moment. Which particular board partner I get depends on what comes back in stock. If Nvidia announces support for adaptive sync very, very soon, I might get a GeForce GTX 980 Ti instead. Otherwise, the Fury X is the choice.
Case: Not sure yet. Probably a mid-tower in the ballpark of $70-$100. There are a lot of cases that will work fine and I'll have to see how prices are when I'm ready to buy the other stuff.
CPU heatsink: Cooler Master Hyper 212 Evo
No real need to overthink it. Cooler Master sells a zillion of these for good reasons, and I'm not likely to overclock.
Right now, it's waiting on the CPU and GPU to be available for purchase.
That comes to somewhere in the ballpark of $1900, not counting $1620 for the monitors. I'm counting on this to last a long, long time, with possibly an upgrade of the video card in a few years or so.