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You probably have some seriously mismatched values between the Apache MPM settings and your system's resources (http://www.devside.net/articles/apache-performance-tuning).

Don't use more threads/processes that your system can handle. And do try to use KeepAlives with a 3 second timeout.

Wordpress and Apache2 can handle it just fine. You probably just need to enable caching.

I had, but it can't for some reason. And I checked the processes, it's only running mysqld and apache2, nothing more. :/

I see WP-Super-Cache there and doing its job, and your site responds instantly most of the time. Then all of a sudden it hangs.

It's probably a bad Apache configuration... you're allowing more workers/threads to spawn than you have RAM to run on that system, and a high KeepAlive timeout (15 seconds) tying them up on connections that aren't needed anymore.

If you configure it right, Apache on an old box with little RAM can easily handle HN-level traffic for a static site (which a cached blog is).

I'd paste the post content into the comments here so those who view the comments because they cant access the site can at least view the post.