We just sent out a machine today that had a hex-core CPU running at 4.4GHz, 128GB RAM, three SSDs that sustain 500+ MB/Sec, two PCIe SSDs that sustain 2500MB/Sec, supports three 4k monitors, all while being super quiet.
This client composes for many video games... and often uses 2500+ notes of simultaneous disk-streaming polyphony from numerous advanced sample libraries.
There's a reason why clients come to us...
We've been in business 20+ years.
I've been a Cakewalk user myself since the forums were on CompuServe.
If you're talking high-performance, I've given numerous examples why a custom machine is the best option.
The harder you push the machine, the more important the details.
ie: Off-the-shelf motherboards don't expose parameters necessary to achieve lowest (most consistent) possible DPC Latency. It is what it is... a general-purpose machine... tailored for the general-purpose user.
A high-performance machine is optimized from top-to-bottom for high-performance use.