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LDSR requires a lot of memory because it has an initial step that the other upscalers don't. You can try running the GUI with the --medvram or --lowvram start up settings. See here for details. https://github.com/AUTOMATIC1111/stable-diffusion-webui/wiki/Run-with-Custom-Parameters
(4) What the SD upscaler does is chop the image into tiles, re-run SD on the tiles, and then stitch them back together. img2imgHD, and this custom script are other options that do a similar thing. You can also do it manually and combine the tiles in photoshop/gimp/krita, but it's a lot more work.