web services - Does uploading size from a silverlight module depend upon the RAM size? -

I have a silverlight module which is uploading a few pictures on the server, I can see an image of a machine up to 4 MB I am able to upload, which has 2 GB RAM. But if the same solution is run on a 1 GB machine, then the image is not uploaded. I use web.config & lt; HttpRuntime executionTimeout = "900" maxRequestLength = "8096" /> has added the following node, I'm converting the image into a byte stream at the end of silver and then sending it what is dependent on RAM for uploading to the webservice ??