Title says all .Aynways, laptop has 6GB of RAM.
Hahahaha, well i never tried BitDefender so far but next week, i'll try it
I've had a GREAT experience with the new Bitdefender Free 2014, installed onto a 2.0 GHZ - 512KB RAM, it runs smoothest of any that I tried, about 5 different AV attempts on 512 RAM this one makes MSE seem sluggish and heavy in comparison. I'm so impressed that I will probably write a little review on it, because not many think positive of Bitdefender free edition. It's an install and forget type anti-virus. Good AV for basic-medium users like myself.I would stay away from AVG to be honest. AVG have a poor detection rate in my opinion, is buggy, causes a lot of Windows related issues (slowness included) and it comes bundled with a spyware (their AVG SecureSearch Toolbar, look it up). Also, AVG PC Tune Up is one of the worst piece of software there is. The only way it actually increase your system performance, is when you uninstall it. Not even joking.
tl;dr version : Stay away from AVG products, they aren't worth it at all. Also, Bitdefender is good, the only issue is that it's an heavy resources consumption Antivirus in my opinion. I would rather pay for a Kaspersky or a ESET product (ESET if you want to keep your resources, their products uses around 200-300MBs less RAM than Kaspersky's products).
But that's just my opinion.