PC requirements

Dear Esther System Requirements

Dear Esther needs at least Intel core 2 duo 2.4GHz or higher, 1GB XP / 2GB Vista of RAM and DirectX 9 compliant video card with Shader model 3.0 support. NVidia 7600, ATI X1600 or better (Pre-Sandybridge Intel graphics chipsets not yet supported) graphics. For the recommended experience you want Quad core 2.4GHz or higher, 1GB XP / 2GB Vista of RAM and DirectX 9 compliant video card with Shader model 3.0 support. NVidia 8800, ATI Radeon 2900 pro or better (Pre-Sandybridge Intel graphic chipsets not supported) graphics.

Verified Sources: Steam store listing
Dear Esther minimum and recommended PC specifications
Component Minimum Recommended
Operating system Microsoft Windows XP / Vista / Vista64 Microsoft Windows XP / Vista / Vista64
Processor Intel core 2 duo 2.4GHz or higher Quad core 2.4GHz or higher
Memory 1GB XP / 2GB Vista 1GB XP / 2GB Vista
Graphics DirectX 9 compliant video card with Shader model 3.0 support. NVidia 7600, ATI X1600 or better (Pre-Sandybridge Intel graphics chipsets not yet supported) DirectX 9 compliant video card with Shader model 3.0 support. NVidia 8800, ATI Radeon 2900 pro or better (Pre-Sandybridge Intel graphic chipsets not supported)
Storage 2 GB HD space 2 GB HD space
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Other platforms

Dear Esther is also available on these systems, where hardware is fixed and no per-PC check is needed:

Linux Mac PC (Microsoft Windows)

Quick answers

Running Dear Esther on PC

Can my PC run Dear Esther?
Compare your CPU, GPU and RAM against the minimum column below. If your parts match or beat every minimum row, the game will launch — though you may need to lower settings. Matching the recommended column is what gets you 60fps at 1080p.
How much storage does Dear Esther need?
2 GB HD space
What is the difference between minimum and recommended specs?
Minimum means the game starts and is playable, usually at 30fps on low settings at 1080p. Recommended is the developer's target for a smooth 60fps experience at high settings.