New Rescaler in 2.0

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I have a short question, how to use the new rescaler for SD 2.0 in Automatic111 ? Which model of upscaler is it the new model ?
i found this x4-upscaler-ema.ckpt , I guess that it has to be run like a normal v1-5-pruned-emaonly.ckpt or f222.ckpt model but then what ? By using this model i have to go upscaling form and then all models like RealESRGAN etc improve the quality of the sample better than using in start v1-5-pruned-emaonly.ckpt ?