Thank you so much for your help! I'll get that Corsair 450W PSU instead ;)
EDIT: Would this actually be better?
The 2 molex will come direct from the PSU, check you have these spare before you order the adapter. Can you get a picture of the label on the PSU for us to look at, or just let us know the make and model that should be shown on the label?
I wouldn't want you to end up using a cheap PSU that could potentially damage components in the future, some can be rated at 550w, but not provide that continuously.
Cheaper credible PSUs exist to the EVGA I mentioned, a 500w corsair is only £42.99.
I just wouldn't want you to end up loosing a £200 GPU and other components, due to a cheap PSU installed in a pre-built PC. Quite often the PSU installed is bare minimum to get the original components working and might not support improvements.
Probably not, unfortunately. However, PSUs are much cheaper than graphics cards. A decent budget psu is something like this and is only £43.
If around £150 is your top budget, you'd be better off getting a slightly cheaper graphics cards and a new Power supply, rather than getting a graphics card and trying to run it on an underpowered psu, which could lead to damaging your computer possibly to the point of no return.
To be helpful, it looks like a good build. Nit picking though, you may not really need that cpu cooler unless the cpu is OEM and does not come with a cooler.
I would suggest going with a 256 gb ssd and a 512gb/1tb hdd It will give you more space for programs on the ssd, figure that my current windows system files take up about 85gbs with patches it doesn't leave you much room for other stuff or 2 128 gb ssd and a 512gb one for a boot drive and the other for games plus the hdd gives you space for file store for music and pictures.
Your wattusage will be around 400w max so you could change out for a smaller PSU, semi modular means you can remove cords from the PSU to make cable management easier. You could go with ones of these http://www.amazon.co.uk/Corsair-Builder-Series-Bronze-Supply/dp/B009RMP2VE/ref=sr_1_1?ie=UTF8&qid=1428965026&sr=8-1&keywords=corsair+CX500 but it's not a big deal.
As for the case just remember to buy extra fans and you're good, or see if you can not find a rosewill case, they normally have 4 or 5 fans preinstalled with the case.
in the future buildapc is good for posts like this.
Corsair CP-9020047-UK Builder Series CX500 ATX/EPS 80 PLUS Bronze Power Supply Unit, 500 W https://www.amazon.co.uk/dp/B009RMP2VE/ref=cm_sw_r_cp_api_2tHjBbYGENX67
It’s this one
No, the monitor hasn't changed, changing cpu doesn't affect the monitor :). I was a noob once too. I'm in the UK also. An ssd would be great also, for quicker boot times. Also, you can downgrade your psu to something like this https:/www.amazon.co.uk/dp/B009RMP2VE/ref=cm_sw_r_cp_apa_8LTiAb27RYS6Y
Or work out your wattage and find an appropriate psu http://www.coolermaster.com/power-supply-calculator/
Also, is rgb ram necessary?
https://www.amazon.co.uk/dp/B009RMP2VE/?tag=pcp0f-21
How is that for a cheaper PSU, gets it down to £609, i'm not too sure what some good PSU's are to be honest, so i was going for something i knew worked well.
First decide on your other parts, then input them into this site: http://powersupplycalculator.net/ to find the minimum wattage of your power supply. Personally, i'd recommend a 500-watt power supply. However, its CRUCIAL not to buy a cheap power supply, as if this fails it can take all your other parts with it. The one that I use is https://www.amazon.co.uk/Corsair-CP-9020047-UK-Builder-Bronze-Supply/dp/B009RMP2VE
Although this all depends on what the pc is for, I'm presuming with the parts you picked it is for gaming or something.
https://www.amazon.co.uk/dp/B009RMP2VE
Corsair CX500 for £42.99
This is my PSU http://www.amazon.co.uk/Corsair-Builder-Series-Bronze-Supply/dp/B009RMP2VE
My budget is not high right now, birthday is in 13 days and so my budget could be as high as £200~$300
Ok thanks! Would a Corsair CX 500W be ok or shall I get the Corsair CX 600W?
This is really more of a r/buildapc thing than an r/gaming thing, but to answer your question.
This Should be fine for you. They also make a modular version if you care about cable management.
thiking about going for this- It should be alright?