Need help with new power supply purchase

Hi Thomaszee, im not an expert on PSU's but i have a 650w PSU in my machine and there is no problem there, and from what i can see from your spec you shouldnt have a problem with a 700w+, just make sure you purchase from a decent manufacturer.

Also if i am right in thinking (correct me if im wrong) also gotta look at the 12v rail? to make sure there will be enough power to the GPU??

Also to save writing out your system spec for each post, update your system spec

Hope it helps :)

Regards
Toby

I'm planning on buying a corsair PSU, most of them have a 12v rail so should be fine on that :)

eVGA recommends a power supply with at least 400W and 24A at +12V for their 550ti card.

Aside from that, your graphics card needs a PCI-E 6 pin auxiliary power connector. (A Molex-to-PCI-E adapter would be an alternative, but it's best to not use adapters.) It needs a 24 pin pin ATX power connector. (20+4 would be fine.) It also needs a 4 pin ATX 12V power connector for the CPU.

Why are you upgrading the PSU? If you have a good 400W one, it's adequate. It would make sense to put a higher powered graphics card in this oldish PC.

If you have the money, it might make sense to buy a larger capacity PSU that can follow you through future upgrades. My old PC Power & Cooling Silencer 750 has lived in several cases. Its electrolytic capacitors haven't shown any tendency to die yet.

Well, the graphics card requires 500W on itself (recommendation on nvidia website) and it also has to feed all other components.

No the card doesn't require 500W itself. That 500W that video card manufacturer's recommend is for the system total, and is always higher than actually needed to take into account people using low quality no name power supplies.

This,

ASUS GeForce GTX 550 Ti Direct CU 1 GB Review | techPowerUp

will give you an idea of what the card actually uses.

AddRAM said:

A Corsair 700 will be more than adequate. Which model were you thinking of getting ?

CORSAIR HX Series HX750 750W ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Modular Active PFC Power Supply - Newegg.com

Corsair Power Supplies 700W - 999W Wattage at TigerDirect.com

Power Supplies - Newegg.com

Just for research purposes, not sure if they ship to you.

My new one will be the HX750

Still deciding on which to buy but that one does look good indeed