Originally Posted by
Shakadam
Clean the fans and heatsinks with some pressurized air, replace the thermal compound for your CPU if you have any around. That should help a bit with temperatures and thus, noise.
The CPU and motherboard are honestly the biggest issues here. As I said they're not truly terrible but they're so old that anything else you change is gonna be bottlenecked hard by your CPU+mobo.
Your CPU is a first generation Nehalem released in late 2009. It was good then, it's pretty bad now. You'd notice a massive difference from pretty much any upgrade tbh. The problem ofc is that everything else is gonna need replacing if you replace your CPU.
The bandaid fix I mentioned with an SSD and a new graphics card is still ofc possible if you don't wanna shell out the money for a total upgrade right now, you can always use those parts when you do upgrade the rest. Just beware that you're not gonna get the max out of a new SSD (because your motherboard only supports SATA2 instead of SATA3, effectively limiting a modern SSD to half the speed it's capable of) or a new graphics card (because A: Your motherboard only supports PCI-E 2.0 instead of 3.0 so limiting the available bandwidth for an average gaming GPU these days and B: Your CPU will be a serious bottleneck for an average gaming GPU (let's say a GTX 1060).
Basically you're looking at a completely new build if you wanna get any real difference. You could save the harddrive I suppose but that's about it.