The GPU should not be at 100°C. As in never. It might die.

The CPU is almost definitely throttling in TF2.

NUMBERS, we need NUMBERS!

Those 30% are not that big of a deal.
Also Hyperthreading on Pentium 4 lul.

I'm pretty sure 2007 TF2 gets more fps than 2017 TF2. No bs items.

Step by step please.

Right now what you're saying is "It doesn't work, please help" without telling me what you did.

What's your point?
If you want to play TF2 without any updates a Pentium 4 would get you 60fps.
If you think TF2 without updates is terrible or 60fps are not really smooth in TF2 then you have a problem.

Sorry, but it's not happening. No magic is going to make that pc run TF2 well.

I'm not sure what you're trying to do.
Any server created in the TF2 client is a listen server.

How are you trying to host a dedicated server, since that was your problem?

Do you mean a listen/local server?

Assuming you still want to stream or whatever you bought the i7 for:
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-7700K 4.2GHz Quad-Core Processor (£310.90 @ Alza)
CPU Cooler: be quiet! Dark Rock Pro 3 67.8 CFM Fluid Dynamic Bearing CPU Cooler (£39.41 @ Novatech)
Motherboard: ASRock Z270 Pro4 ATX LGA1151 Motherboard (£105.64 @ Amazon UK)
Memory: ADATA XPG Z1 16GB (2 x 8GB) DDR4-2800 Memory (£104.00 @ Amazon UK)
Total: £559.95
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-04-02 11:13 BST+0100

Keep the rest.

If you don't want to oc just swap the 4790 for a 4790K but the difference is only 10%, not really worth it.

Alcohol

Question still stands, how can people join your "offline server"?

What "offline servers"?

Budget?

#2260
i3 should be as fast in TF2, no idea about Serious Sam though.
2x4GB is fine, a mobo with 4 slots means you can still upgrade should you need to.
Get an SSD. If you're fine with 250 or 500GB go with SSD only.
470 isn't much slower than a 480, price difference depends on sales though, not sure if you think the savings are worth it.
Not a fan of the SPEC-02 but I don't really care. There's lots of options though.
450W is plenty.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i3-7100 3.9GHz Dual-Core Processor ($118.89 @ OutletPC)
Motherboard: Gigabyte GA-B250M-DS3H Micro ATX LGA1151 Motherboard ($69.89 @ OutletPC)
Memory: G.Skill NT Series 8GB (2 x 4GB) DDR4-2400 Memory ($57.99 @ Newegg)
Storage: SK hynix SL308 250GB 2.5" Solid State Drive ($88.88 @ OutletPC)
Storage: Toshiba P300 1TB 3.5" 7200RPM Internal Hard Drive ($48.99 @ Other World Computing)
Video Card: XFX Radeon RX 470 4GB HS Triple X Video Card ($169.99 @ Amazon)
Case: Fractal Design Core 1000 USB 3.0 MicroATX Mid Tower Case ($38.99 @ SuperBiiz)
Power Supply: Corsair CXM 450W 80+ Bronze Certified Semi-Modular ATX Power Supply ($53.98 @ Newegg)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($88.58 @ OutletPC)
Monitor: Acer XF240H 24.0" 1920x1080 144Hz Monitor ($199.97 @ Amazon)
Total: $936.15
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-03-31 06:46 EDT-0400

I see you ended up getting a more reasonable B350 mobo.
Well, have fun with the pc, RGB isn't exactly required for that.
Also good luck with the OC, may you reach those sweet 4 GHz.