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What power supply do i need?

Last response: in Systems
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March 2, 2013 11:47:50 PM

Hello,

Im building a PC with these components and was wondering how much watts i need in a psu:

CPU - Intel i5 3570k 3.4GHz
GPU - 2x XFX HD Radeon 6870 1gb (crossfire)
MOBO - MSI Z77A G41 Intel Z77 Socket 1155
RAM - Corsair Vengeance 8GB DDR3 1600MHz
HDD - Seagate Barracuda 1TB 7200 RPM SATA III Internal Hard Drive
CPU Cooler- Xigmatek Dark Knight Night Hawk Edition
Disk Drive- LiteOn IHOS104 4x SATA Internal BluRay BD-ROM Drive
Case- CM Storm Enforcer

I need something below £70

More about : power supply

a b B Homebuilt system
March 2, 2013 11:50:02 PM

Get a PSU from Antec, XFX, Corsair, Seasonic. 550w-650w is more than enough.
March 2, 2013 11:55:32 PM

what about if i put in 2 6870's in crossfire mode, because im thinking of doing that in the future.
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a b B Homebuilt system
March 3, 2013 1:06:16 AM

700w will be more than enough
a b B Homebuilt system
March 3, 2013 1:13:05 AM

6870 in CF with that CPU will only draw around 500. So the 650W will be fine. Problem is the 6870 needs two PCIe plugs, and most/many 650s only have two. So make sure you buy a good one that has four.
March 3, 2013 1:22:47 AM

This ^ I was all set to say a 500 watt PSU was more than enough. If you have have thoughts of crossfire then do go with the 650 watt PSU but please pick a quality one. So many people build nice rigs like yours and cut corners on the thing that supplies power to them.

This is a very good list ranking PSU's(Tier 2 is what your likely interested in):
http://www.eggxpert.com/forums/thread/323050.aspx

They also list review sites to check in this link which all are very good.
March 3, 2013 12:56:13 PM

JamesSneed said:
This ^ I was all set to say a 500 watt PSU was more than enough. If you have have thoughts of crossfire then do go with the 650 watt PSU but please pick a quality one. So many people build nice rigs like yours and cut corners on the thing that supplies power to them.

This is a very good list ranking PSU's(Tier 2 is what your likely interested in):
http://www.eggxpert.com/forums/thread/323050.aspx

They also list review sites to check in this link which all are very good.


thanks for the reply...

i was wondering if you think this is any good > http://www.amazon.co.uk/CiT-750W-Power-Supply-Rails/dp/...
March 3, 2013 12:59:50 PM

JamesSneed said:
This ^ I was all set to say a 500 watt PSU was more than enough. If you have have thoughts of crossfire then do go with the 650 watt PSU but please pick a quality one. So many people build nice rigs like yours and cut corners on the thing that supplies power to them.

This is a very good list ranking PSU's(Tier 2 is what your likely interested in):
http://www.eggxpert.com/forums/thread/323050.aspx

They also list review sites to check in this link which all are very good.


if that psu's quality is no good then would i be better off with this? > http://www.amazon.co.uk/XFX-P1-750S-NLB9-PRO750W-Editio...
a b B Homebuilt system
March 3, 2013 2:09:55 PM

James, those PSUs won't work. As I said above he is in between PSUs with his planned build. 650W PSUs have the power, but not the plugs needed to do it. He needs to jump to a 750W PSU with the four 6pin PCIe plugs. (He could use adapters but I always suggest not doing that.) This PSU should work.

http://www.amazon.co.uk/Corsair-CX750-Builder-Series-Br...

Thankfully its not expensive. He could use the new Gold rated 650W PSU, but probably cheaper to just get one of these. The XFX 750W will also work btw.
March 3, 2013 4:28:37 PM

4745454b said:
James, those PSUs won't work. As I said above he is in between PSUs with his planned build. 650W PSUs have the power, but not the plugs needed to do it. He needs to jump to a 750W PSU with the four 6pin PCIe plugs. (He could use adapters but I always suggest not doing that.) This PSU should work.

http://www.amazon.co.uk/Corsair-CX750-Builder-Series-Br...

Thankfully its not expensive. He could use the new Gold rated 650W PSU, but probably cheaper to just get one of these. The XFX 750W will also work btw.


thanks for the choice, im going to buy it for £65! :D 
March 4, 2013 1:02:48 AM

4745454b said:
James, those PSUs won't work. As I said above he is in between PSUs with his planned build. 650W PSUs have the power, but not the plugs needed to do it. He needs to jump to a 750W PSU with the four 6pin PCIe plugs. (He could use adapters but I always suggest not doing that.) This PSU should work.

http://www.amazon.co.uk/Corsair-CX750-Builder-Series-Br...

Thankfully its not expensive. He could use the new Gold rated 650W PSU, but probably cheaper to just get one of these. The XFX 750W will also work btw.



That is a decent choice as well. I never really care about PCI-e plugs as most graphics cards come with molex to PCIe adapters and if not they are dirt cheap: http://www.amazon.co.uk/NEW-PCI-Express-Power-Adapter/d...
!