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
Intel Core i7-8700K $340Nvidia GTX 1070 $330Samsung 850 Evo 250GB $85
AMD Ryzen 5 1600 $130Nvidia GTX 1060-6GB $243Samsung 850 Evo 500GB $104
Intel Core i5-8600K $237AMD RX 480 $280Samsung 850 Pro 256GB $100
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $130SanDisk Extreme 64GB $43
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $869SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $45Corsair Vengeance LPX DDR4 3200 C16 2x8GB $130SanDisk Ultra Fit 32GB $12
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