Have you set up static caching in RAM correctly?

Question

Nginx

I decided to unload the HDD a little, I did it like this:
File is given from the subdomain.
content.site.conf:

server {
    listen content.site:80;
    server_name content.site;

     location ~* ^.+\.(jpg|jpeg|gif|png|js|css|swf|docx|doc) {
                proxy_cache static_cache;
                proxy_cache_key "$host$request_uri $cookie_user";
               proxy_cache_valid 200 60m;
               proxy_set_header Host cache.$host;
               proxy_pass http://127.0.0.1;
        }
}

server {
    listen 127.0.0.1:80;
    server_name cache.site;
    location ~* ^.+\.(jpg|jpeg|gif|png|js|css|swf|docx|doc)$ {
        allow 127.0.0.1;
        deny all;
                root /var/www/content;
    }
}

Cache config from nginx.conf

proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=static_cache:128m inactive=60m max_size=500m;

Further /etc/fstab:

tmpfs /var/cache/nginx tmpfs noatime,nodiratime,nodev,nosuid,uid=33,gid=33,mode=0700,size=512M 0 0

Well, mount /var/cache/nginx like.
And now, a month later, it became interesting, but did I do everything right? Did using a hodgepodge from the documentation and articles from Google.