Image upload memory problem

Hello everyone

I am uploading three images which has 2 more MB.
I am using carrierwave for file upload.
Images not getting uploading, showing error. and even sometime server
getting down.

i asked server people, they said some request using lot of resource and
appilcation stop responding.
Is this really uploading three images in 2 MB need More Ram size?
may I have any code issue?

Please help