Ardu

^what she said.
You could argue with a Ryzen 2400G, wich is a bit above 100€, but not much more. the 200€ that @Tristerin quoted is already on the highest end...

The Board you said you have also look rather low endish...

150 would be super nice for a friend. i wouldnt sell for less than 200-250. if bios is older or using the guild over @  https://overclocking.guide/gigabyte-z170-non-k-overclocking-guide/
you can push that cpu pretty ez he should be happy

Please note I changed my amount.  It's still a good price to a friend without giving the thing away.
 
Then again, if he's near a Microcenter, he'd be a fool not to go with a Ryzen 1600.

I'd do $150 for the CPU/Mobo.

Edit: I upped it from $100.  The 6700 is being Ebayed for $170-$200, so I halved that to $100 and added $50 for the motherboard.
 
https://www.ebay.com/sch/i.html?_from=R40&_nkw=intel+6700&_sacat=0&rt=nc&LH_Complete=1
 

Seeing as the chips rivals an Ryzen 5 1500X/2400G, I think second hand the price of that chip would be about 100 USD max, but maybe even a bit less with Ryzen 3000 coming up.

So as the tittle suggests, I have a 75hz monitor. 
 
Out of curiousity I set it to run a 60hz.
 
Then it suddenly slows down the windows animations and videos.
 
What causes this? Thanks!

I'll return to this topic later, when im done with work and have tested the things that have been suggested in the thread! ?

If you go to 'Device Manager' and then 'Disk Drives' it should have then listen there, and one should be called 'KINGSTON' followed by some numbers or something, that's what model it is.

Well because you've got your games on a separate drive, I'd be led to believe that could also be the problem, but it does sound like it's your OS' drive as that would also have an effect on your games. I think, if it's that much of a hindrance to your machine, you might be best off saving all of your documents (to a cloud or USB or something) and resetting your PC fully. And then reinstalling all of your stuff. I know this is a hassle, but if the problem is still there after doing this, it kinda finds the solution to your problem, which would probably be to load your OS onto a different drive, or buy a new drive as well. BUT FIRST BEFORE DOING ANY OF THIS, UPDATE YOUR SSD' DRIVERS! https://www.kingston.com/en/support/technical/category/ssd
Find which one is yours from here!

In addition to what the above person said, I think you should focus on a CPU before GPU, but if you had your heart set on a 2060 down the line, I think maybe a Ryzen 5 2600 may be a good route. I dunno where you're from but it's only like £130 in the UK.

It was given to me by a friend, it was out of his old PC so luckily I haven't lost anything other than time. I've given the thing Forest Whittaker eye so many times and I haven't even booted it fully yet XD 
 
Thank you for the help it's much appreciated. 

Going off thread a little and talking of Forest Whittaker eye.... Look at this XD 
 
TOOGOO Gtx1050Ti Skynet Image Card 4Gb 128Bit Gddr5 Dp/Hdmi/Dvi 768 Cuda Core 3000Mhz 7680 X 4320 / 60Hz https://www.amazon.co.uk/dp/B07QLWP8L9/ref=cm_sw_r_cp_apa_i_2hK9Cb2940WWN
 

He's posting this everywhere

This is about the smallest ATX case available. The motherboard is just a placeholder for the one you have.
 
PCPartPicker Part List
CPU: Intel - Core i7-6700 3.4 GHz Quad-Core Processor  (Purchased For £0.00) 
CPU Cooler: be quiet! - Dark Rock 4 CPU Cooler  (£53.74 @ Amazon UK) 
Motherboard: Gigabyte - GA-Z270-HD3 ATX LGA1151 Motherboard  (Purchased For £0.00) 
Memory: Team - Vulcan 16 GB (2 x 8 GB) DDR4-2400 Memory  (£69.95 @ Amazon UK) 
Storage: Western Digital - Blue 500 GB 2.5" Solid State Drive  (£53.99 @ Amazon UK) 
Case: Cooler Master - MasterBox Q500L ATX Mid Tower Case  (£54.56 @ More Computers) 
Power Supply: Corsair - CXM (2015) 450 W 80+ Bronze Certified Semi-modular ATX Power Supply  (£52.94 @ Box Limited) 
Total: £285.18
Generated by PCPartPicker 2019-05-29 17:22 BST+0100

If it's for your grandparents I highly recommend NOT building a custom PC for them unless you want to handle all of the support and be on-call 7 days a week. Go pick up a cheap pre-built and call it a day, maybe even look at a $300 Intel NUC which will probably be overkill for them (check out my daily driver in my signature, I highly doubt they're doing half of the work I do on mine and my Celeron has plenty of power).

Itx motherboards off eBay are not so bad.
Any ITX B150/250 or H110/210 would be suitable, or H270/170 if you want something nice.

A workstation is a PC for very demanding tasks like video editing, or at least that's how most people use it. 
 
If your tasks include browsing and basic word processing, then:
PCPartPicker Part List Type Item Price CPU AMD - Ryzen 3 2200G 3.5 GHz Quad-Core Processor £78.04 @ More Computers Motherboard Biostar - X470GTN Mini ITX AM4 Motherboard £100.74 @ Ebuyer Memory Corsair - Vengeance LPX 8 GB (2 x 4 GB) DDR4-2666 Memory £41.87 @ Amazon UK Storage ADATA - XPG SX8200 Pro 512 GB M.2-2280 Solid State Drive £75.75 @ CCL Computers Case Silverstone - SG13 Mini ITX Tower Case £39.95 @ Amazon UK Power Supply SeaSonic - FOCUS SGX 450 W 80+ Gold Certified Fully Modular SFX Power Supply £95.47 @ Scan.co.uk   Prices include shipping, taxes, rebates, and discounts     Total £431.82   Generated by PCPartPicker 2019-05-29 13:05 BST+0100    

PCPartPicker Part List
CPU: AMD - Ryzen 3 2200G 3.5 GHz Quad-Core Processor  (£78.04 @ More Computers) 
Motherboard: Biostar - X470GTN Mini ITX AM4 Motherboard  (£100.74 @ Ebuyer) 
Memory: Patriot - Viper 4 8 GB (2 x 4 GB) DDR4-3000 Memory  (£44.99 @ Amazon UK) 
Storage: ADATA - XPG SX8200 480 GB M.2-2280 Solid State Drive  (£62.86 @ CCL Computers) 
Case: Thermaltake - Core V1 Mini ITX Desktop Case  (£36.38 @ Amazon UK) 
Power Supply: be quiet! - Pure Power 11 CM 400 W 80+ Gold Certified Semi-modular ATX Power Supply  (£50.96 @ Aria PC) 
Total: £373.97
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-05-29 13:31 BST+0100

Yeah I think so too, thanks for the help. 

If nothing else works I'd just RMA it.

This is scary, someone hold me? ?

You will gain some FPS, generally in the 10-15 range which you really wont see beyond seeing a higher FPS number on screen if you have your FPS value showing. 

Whatever it is, it won't be Super Reasonable Pricing.

You need to enable QoS to actually fix the problem - which is that his PC is using too much of your bandwidth.
 
QoS = Quality of Service - and is a term used to describe how we can manipulate the network in such a way as to cause a desired outcome. In this case, the desired outcome is for both of you to be able to use the Internet to some beneficial degree.
 
Ideally, you'd use QoS to simply limit all users to an equal amount (For example, if there's just two of you, then limit both of your computers to 15 Mbps each). If your router has more advanced QoS features, you might even be able to configure "boost" modes, where if he's not using his computer at all, it'll allow you to take the entire 30 Mbps (at least, until he logs back in, in which case, you'd both drop back down to 15 Mbps each).
 
Simply blocking him is not a solution. What are you going to do once he starts bitching that he has no internet?

There is a performance difference but it is quite small, see https://www.techpowerup.com/reviews/Intel/Core_i7_8700K_Coffee_Lake_Memory_Performance_Benchmark_Analysis/ for data.
 
Going to 32GB would offer some improvement. In the general case, more memory offers a better performance improvement than higher speed memory. Unless one is into content creation or other memory intensive work, the real world benefit of 32GB over 16GB would be marginal.