A Percentage measures of a PC's suitability for desktop, gaming and workstation use.
UFO »100%
Nuclear submarine 90%
Aircraft carrier 80%
Battleship 70%
Battle cruiser 65%
Destroyer 60%
Gunboat 55%
Yacht 45%
Speed boat 40%
Jet ski 35%
Sail boat 30%
Raft 25%
Surfboard 15%
Tree trunk 0%
PCs are assigned a performance classification from the above hierarchy for desktop, gaming and workstation usage. All five component classes (CPU, GPU, SSD, HDD, RAM) are required for a complete PC score, but the HDD can be excluded without a material penalty. When a build has more than one component of the same type, the faster component is used. The results of millions of PCs are available on the custom build page.
Desktop

Desktop
Surfing, email, office apps, music/video playback.

This formula is weighted towards single-core CPU performance:

50%*DCPU Bench + 10%*GPU Bench + 30%*SSD Bench + 10%*HDD Bench

(DCPU Bench = 80% Single core, 10% Quad core, 10% Multi core)
Gaming

Gaming
3D Gaming and graphics.

This formula is weighted towards GPU performance:

25%*GCPU Bench + 50%*GPU Bench + 15%*SSD Bench + 10%*HDD Bench

(GCPU Bench† = 30% Single core, 60% Quad core, 10% Multi core)
†For games that can't use multiple cores the desktop CPU Bench is a better indicator of performance.
Workstation

Workstation
Number crunching, virtual machines, databases, audio/video encoding.

This formula is weighted towards multi-core CPU performance:

40%*WCPU Bench + 20%*GPU Bench + 25%*SSD Bench + 15%*HDD Bench

(WCPU Bench = 10% Single core, 10% Quad core, 80% Multi core)

The Best.
CPUGPUSSD
AMD Ryzen 5 1600 $175Nvidia GTX 1070 $447Samsung 850 Evo 250GB $104
Intel Core i7-8700K $320Nvidia GTX 1060-6GB $250Samsung 850 Evo 500GB $110
Intel Core i5-8600K $239AMD RX 480 $280Samsung 850 Pro 256GB $116
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $177SanDisk Extreme 64GB $44
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $911SanDisk Extreme 32GB $30
Seagate Barracuda 2TB (2016) $58HyperX Fury DDR4 2133 C14 2x8GB $226SanDisk Ultra Fit 32GB $12
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