For a site where Nginx doesn't make sense, has anyone used memory caching on Apache (to store static files in memory) with success? I am curious as to how this

For a site where Nginx doesn't make sense, has anyone used memory caching on Apache (to store static files in memory) with success? I am curious as to how this would perform in comparison. e.g. modmemcachecache http://code.google.com/p/modmemcachecache/ http://code.google.com/p/modmemcachecache/