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.

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)

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.

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.
Intel Core i7-8700K $325Nvidia GTX 1070 $380Samsung 850 Evo 250GB $95
AMD Ryzen 5 1600 $150Nvidia GTX 1060-6GB $240Samsung 850 Evo 500GB $120
Intel Core i5-8600K $240AMD RX 480 $280Samsung 850 Pro 256GB $163
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $155SanDisk Extreme 64GB $80
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $901SanDisk Extreme 32GB $30
WD Blue 1TB (2012) $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $175SanDisk Ultra Fit 32GB $12
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