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okay but what are you running, are you running algos do you use a ton of indicators do you need to have 50 charts open at once how many screens, do you see all the questions you need to ask your self? I personally buy refurbished computers and tweak them to what I need.
-P
"Truth is not what you want it to be; it is what it is, and you must bend to its power or live a lie"-Miyamoto Musashi
save the money ! start with Demo accounts because 80 Percent are loosing money !!!
purchase a normal cheap PC and spend the money for subscribing to an automated signals from traders with
a long trading history . This way I learned a lot about trading .
While I don't use an iMac, I have been using an older 15" macBookPro with retina display and a 2.4GHz i7 chip(early 2013). I run it as a dual boot machine with the 256GB SSD split in half, running Win 7 Pro in the BootCamp partition using NinjaTrader 8 as the trading platform. It is hard wired to my router during trading hours. I run it as a hot standby for my main trading computer or trade from it when I'm traveling. The performance over wifi is suboptimal due to the vastly higher latency, but my workaround is using MIT entries & exits to ensure fills at the expense of more slippage.
On the mac side, I'm running Mojave (mac OS 10.14.3). The 256GB drive is a bit small to split in half & have a reasonable amount of room for lots of stuff, but a 128GB SD card works well as a home most user files. My MBP is getting close to end-of-life, so I'll be looking for a replacement later this year
I know of a guy in Germany who is using a mac Pro with an 8-core Xeon with the whole SSD dedicated to Windows so he can run NinjaTrader 8. Apparently, it's a very fast PC running in Windows mode & with the dual AMD graphics cards he can run twin 4K TVs as monitors.
Currently, my $ would be on the 27" iMac Pro with the 16-core Xeon W chip & as much ram & SSD as you can afford. The 5K display is outstanding when I saw it at the ABQ Apple store in New Mexico.
Best wishes finding a factory refurb to your specifications.