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I have an old PC that I built ages ago that still runs Windows XP. Every now and again I say to myself that I should sort something out that is a bit more up to date, though I don't really do much apart from browse on the internet, watch the occasional thing and use word processing, nothing in th least taxing. I guess I would like something a bit quicker because I do find using it a bit frustrating sometimes when I am trying to do a few things at the same time.
Anyhow this is what I have at present : AsusM4A78-HTPC motherboard with Athlon II x2 250 processor and 1.78GB RAM. I want to just replace these and re-use everything else ie power supply, hard drive, case etc so which sort of bundles would give a meaningful upgrade but be on the cheaper side - I do not have a clue as to what is good or not though presume that anything slightly modern would be an improvement. I would be running Windows 10 on it.
There is little point in upgrading your existing components as new stuff is so much cheaper. It's a bit like spending £1000 on new bits for your 1998 car when the same amount will buy you a 2005 model with change. You're going to have to bite the bullet I'm afraid, and ditch what you have, then buy a newer PC. The probability is that your existing set-up will not be germain to Windows10 so a newer unit will prove cheaper and fool-proof in the long run.
Spend £400 and buy a new one. I can suggest an option if you wish.
Headphone System: Auralic Aries Mini • LDA LPSU • Metrum Acoustics Musette • Metrum Acoustics Aurix • AudioQuest NightHawk Carbon • NVA SSP MKII
PC System: Cambridge Audio DACMagic Plus • LDA LPSU • Grado SR80e
Server: VortexBox Prestige 2 MX • Paul Baldwin LPSU • Supra CAT8
Speakers - Monitor Audio Silver RX2
Cables - NVA LS1+LS3, SSC, Gotham S/PDIF, IBRA Optical
Digital - NAD C516BEE, SONY ST-SDB900 DAB TUNER, TEAC UD-H01 DAC
Analogue - Pro-Ject Debut Carbon Esprit SB, Graham Slee Gram Amp 2 Phono
Cans - Grado SR80, ATH-M50X
I feel no need for an SSD on my system. If you get one, do not allow PC to hibernate and do not defragment the drive.
I'd recommend going down the Intel route for processors: Intel Core i5-7400 with stock cooler; LGA 1151 socket motherboard such as the GIGABYTE GA-B250M-DS3H; 1 x 8gb stick of DDR4 ram. A new hard disk wouldn't go amiss - a 2Tb something or other. You can probably reuse the case & CD/DVD drives, mouse & keyboard and maybe the power supply, but not much else.
It's been faultlessly running Blue Iris on Windows 10 as a cctv system for 4 months now.
If all you want is a general purpose home PC, then a used, recent model, HP or Dell business machine makes a lot of sense.
Far better than buying some wank off PC World.