NVIDIA K610 video card with 1GB RAM
Direct Replacement for AMD Radeon HD 6750M
(Apple part number: 661-5967 661-6023 109-C29557-00)
for Apple 21.5 inch iMac A1311 2011 model only
(check with me first if you are not sure which card you have)
Please
note this card uses a newer NVIDIA GPU chip which
supports the Metal API for running MacOS Mojave / Catalina or Big Sur / Monterey
Flashed with custom Apple firmware to enable Boot-screen and Brightness control
(Heat-sink not included, re-use the current one, no modification needed)