A Percentage measures of a PC's suitability for desktop, gaming and workstation use.
Desktop

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

This formula is weighted towards single-core CPU performance:
50%*CPU Bench + 10%*GPU Bench + 30%*SSD Bench + 10%*HDD Bench
(DCPU Bench = 80% Single core, 10% Quad core, 10% Multi core)
Gaming

Gaming PC3D 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 PCNumber 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)

Performance classifications

For each of the above categories PCs are assigned a classification from the following hierarchy:

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%
All five component classes (CPU, GPU, SSD, HDD, RAM) are required for a complete build 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. Results from 500,000+ builds are available on the custom build page.

The Best.
CPUGPUSSD
Intel Core i7-7700K $300Nvidia GTX 1070 $390Samsung 850 Evo 250GB $96
AMD Ryzen 7 1700 $280AMD RX 480 $491Samsung 850 Pro 256GB $126
Intel Core i5-7600K $220Nvidia GTX 1060-6GB $260Samsung 850 Evo 500GB $159
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $158SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $75G.SKILL Trident Z DDR4 3200 C14 4x16GB $842SanDisk Extreme 32GB $22
Seagate Barracuda 2TB (2016) $60Corsair Vengeance LPX DDR4 3200 C16 2x8GB $180SanDisk Ultra Fit 32GB $13
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