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
(CPU 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, 50% Quad core, 20% 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 i7-6700K $330Nvidia GTX 1070 $376Samsung 850 Evo 250GB $98
Intel Core i5-6600K $220AMD RX 480 $200Samsung 850 Pro 256GB $120
Intel Core i7-4790K $339Nvidia GTX 1060-6GB $250Samsung 850 Evo 500GB $165
HDDRAMUSB
Seagate Barracuda 7200.14 1TB $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $103SanDisk Extreme 64GB $28
WD Black 6TB (2015) $270G.SKILL Trident Z DDR4 3200 C16 2x8GB $122SanDisk Extreme 32GB $21
WD Blue 1TB (2012) $50G.SKILL Trident Z DDR4 3200 C14 4x16GB $545SanDisk Extreme 16GB $16
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