Need Help with my Ram

[Darkmatter35]

Hey Guys I have come to you with a ram question. I run a sandy bridge 2nd gen intel core i3 processor. I think the ram is DDR2? Idk. But on to my problem. For those of you that play Minecraft I get weird block lag for no apparent reason when I build. Here is a video : https://www.youtube.com/watch?v=jMJtU4GwXNE
I used to think that the problem was because of my internet signal so I got a hardline connection to my router. That didn't fix anything. Now I am thinking that the reason is because my ram is doing that thing where it is copying to my hard drive (don't know the term but I know it exists). My Ram is like janky old Samsung Planet First 8gb kit. I don't know the speed because it doesn't say on the side of the sticks. I tested this on my dad's computer with the exact same files but different hardware and I didn't have the lag issue. He runs this old amd processor that is less powerful than mine. Would it be wise to replace my ram and do you have any recommendations for a lite weight computer that mostly runs minecraft?

[ERSCreeper]

Download memtest and test out your ram.

[jezza39]

2nd Gen Intel Core i3 would be sandy bridge no? Definitely DDR3. Maybe it's running out of spec, have a look in the bios and make sure the timings are what you see on the box/sticks

[LawrenceBarnes2013]

Time for Ram swap dude ,probably should of don this a wile a go

[Jirne]

Ramtest it with anything like memtest, prime, occt,... If it gives errors => go to bios, check what settings its running and post them here. If no error => could be java/minecraft related, reinstall both