# Doubt shaders simulate tv crt

**URL:** <https://emuelec.discourse.group/t/doubt-shaders-simulate-tv-crt/2601>\
**Category:** Amlogic Devices\
**Created:** [May 19, 2024, 12:33am UTC](https://emuelec.discourse.group/t/doubt-shaders-simulate-tv-crt/2601 "2024-05-19T00:33:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jonesff7](https://avatars.discourse-cdn.com/v4/letter/j/f475e1/32.png) [@jonesff7](https://emuelec.discourse.group/u/jonesff7)\
**Post date:** [May 19, 2024, 12:33am UTC](https://emuelec.discourse.group/t/doubt-shaders-simulate-tv-crt/2601/1 "2024-05-19T00:33:03Z")

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I use a TVbox with s905x3 4GB Ram + Emuelec 4.6 on a 32" LED TV but the image of SNES, Mega Drive, NES, Mastersystem, N64, Arcade games is not good, which shader do you recommend to simulate the most realistic CRT TV? good color, brightness and contrast

Does using a shader heat up the processor too much and shorten the life of the box?

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**Author:** ![camicoru](https://yyz2.discourse-cdn.com/free1/user_avatar/emuelec.discourse.group/camicoru/32/800_2.png) [@camicoru](https://emuelec.discourse.group/u/camicoru)\
**Post date:** [October 29, 2026, 11:49am UTC](https://emuelec.discourse.group/t/doubt-shaders-simulate-tv-crt/2601/2 "2026-10-29T11:49:09Z")

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For an S905X3, try `zfast-crt` or `crt-pi` first; they give scanlines and a softer CRT look without the heavier effects of advanced CRT shaders. Shader names and performance depend on the RetroArch core and video driver. A shader adds some GPU load, but it shouldn’t shorten the box’s life if it stays within normal temperatures.