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#Where H/s and watts come from

parts H/s = CPU + GPU + SSD + RAM
watts = board base (16 W, or 4 W on DDR2/DDR3) + CPU + GPU + SSD + RAM + cooler + fans
PC H/s = parts H/s × efficiency multiplier

#RAM: size and speed

RAM makes more H/s as you add capacity, a little less with each doubling, and it scales with its speed.

DDR5: (10 + 6 × log2(total GB ÷ 8)) × speed ÷ 4,800
DDR2 / DDR3: the table below × speed ÷ 1,600

The speed is the slowest of the board’s memory speed and every module’s speed. One slow module slows them all.

#What fits

• One of each. A PC needs exactly one case, motherboard, CPU, graphics card, SSD, power supply and CPU cooler, plus at least one RAM module.
• Socket. The CPU’s socket must match the motherboard’s.
• Memory type. Every RAM module must match the board’s memory type (DDR2, DDR3 or DDR5).
• RAM slots and size. No more modules than slots, no more total RAM than the board’s maximum, and no module bigger than the board takes.
• Fans. No more case fans than the case has mounts.
• Power supply. The PC’s draw plus a 15% reserve must fit. A 400 W PC needs at least a 460 W power supply.
• Old coolers. A retro LGA775 or legacy LGA1155 cooler fits only a board of its own family. Modern air and liquid coolers fit every board.
• Sealed systems can’t be changed at all.

The Build window checks every part as you go and won’t save a PC that doesn’t work.

#The efficiency curve

Stronger builds get extra H/s from the same parts. The game gives every build a value:

value = 7.96 × parts H/s − 0.594 × watts

A higher value earns a higher multiplier, from ×1.00 for a Seed-class build up to ×1.40 at the top. Between the points below the multiplier grows smoothly (straight lines on a log-log chart), and it is already part of every H/s the game shows you.

PC	Parts H/s	Multiplier	PC H/s
Grain	0.25 H/s	×1.0000	0.25 H/s
Pebble	1.5 H/s	×1.0000	1.5 H/s
Seed	8.2 H/s	×1.0000	8.2 H/s
Sprout	14.2 H/s	×1.0521	14.9 H/s
Sapling	18.2 H/s	×1.0863	19.8 H/s
Fern	38 H/s	×1.1459	43.5 H/s
Grove	71.7 H/s	×1.1883	85.2 H/s
Cedar	135.5 H/s	×1.2307	166.8 H/s
Mack mini M4 Pro	145 H/s	×1.2383	179.6 H/s
Redwood	331.9 H/s	×1.2880	427.5 H/s
Canopy	654.3 H/s	×1.3313	871.1 H/s
Sequoia	1,280 H/s	×1.3746	1,759.5 H/s
Hyperion	1,919.3 H/s	×1.4000	2,687.1 H/s

#H/s per W

H/s per W is how many H/s a PC makes for each watt it draws. It is the best way to compare running costs: a PC with twice the H/s per W makes the same H/s for half the electricity.

1. Grain0.05
2. Pebble0.07
3. Seed0.11
4. Sprout0.14
5. Sapling0.23
6. Fern0.49
7. Grove0.74
8. Cedar1.05
9. Mack mini M4 Pro2.76
10. Redwood1.60
11. Canopy2.21
12. Sequoia5.06
13. Hyperion5.45

#Ready PC or parts: same result

A ready PC and the same parts built by hand give exactly the same H/s and watts. Upgrading one part recalculates everything, the efficiency multiplier included.

#Sealed systems

The Mack mini M4 Pro is a sealed system: its CPU, GPU, RAM and SSD are fixed, and it can’t be opened or changed. It makes 179.6 H/s on 65 W and can be installed on an open desk once its Hall and power requirements are met. Put it where a tower was and your tower stays saved, so you can switch back. It runs at its own temperatures (47 °C / 45 °C fresh) and still needs thermal paste and fan cleaning: one cleaning covers the whole machine.

#Upgrading

• Nothing is lost. A replaced part goes to your inventory, ready for another desk.
• Build keeps a draft. Your changes apply when you press Save & Exit.
• Follow the tip. The Build window suggests your best next upgrade.

#Parts reference

Every part on sale, cheapest first. Prices in US dollars.