Adequate Wattage?

6 replies [Last post]
Joined: 02/08/2012
Posts: 14

I'm think about building a system like this:
- i7-3770K (I know it's not out yet, but assume the 77W TDP it's supposed to be rated at)
- High-end motherboard (maybe something like an ASUS P9Z75 if it does come out)
- 8GB of RAM (1600MHz)
- An SSD and a 7200RPM HDD
- Dual 7870 (I know they're not out yet, but maybe assume dual 6870 in terms of power consumption)
- DVD Burner
- Four of five fans (if that matters)

I used the Newegg PSU calculator (yes, I know, it's really basic...)
They gave me 674W. What would be the ideal wattage? 650W? 700W? 750W? Would 600W work?
I don't want to go the absolute minimum because PSUs degrade over time.

Also, in this range, what PSUs would you recommend?
I've been looking at the Corsair TX650M.

Thank you! And if you see any bottlenecks in my list, please let me know :D!

Andy Han

Joined: 01/15/2012
Posts: 208

im using the ocz zt-series 750w fully modular psu

Asus P8P67 Deluxe : i7 2600k : Corsair Vengeance 8 GB 1600
Asus GTX 560 Direct Cu II OC : Corsair H100
Kingston Hyper X 3K 120 GB : WD Caviar Black 1 TB : Windows 7 Home Premium
OCZ ZT 750W PSU : CM 690 II

Joined: 07/08/2008
Posts: 163

Depends on how much juice the 7870's pull, won't know that until they release. I'd say at the very least get a good quality 650 watt unit, it wouldn't hurt to get a good 750 watt unit though for overhead and overclocking room.

Q6600 @ 2.4Ghz 4GB DDR2 800Mhz 500GB ATI HD 4850 512mb 22" LCD

Joined: 02/19/2012
Posts: 16

It would be good to ensure you have approximately 100-200 extra watts from what is calculated, just to be safe. You just have to consider that when your CPU or GPU(s) are under full load they will of course draw more power. So you could also look at what the max power draw is for those components.

Nice build though mate. I hope you can do it once released etc.

i7-2600k / ASUS P8P67 Pro / Radeon 6870 / 2x 120 OCZ SSD, 1TB WD HDD / 16GB DDR3 1600 Corsair Vengeance RAM / Win 7 Ultimate x64

doggman's picture
Joined: 02/17/2012
Posts: 48

It's good to have the head room because sometimes some components will need more power. For example, when you decide to overclock, it uses a little more power. Also like what modena said, when your CPU and GPU(s) are under full load they will need that extra power from the power supply. So overall, I recommend you getting a power supply that is about 850 watts just to be 100% sure. But if you need to save the money then your better off getting a power supply around 750 watts. It would do the just as well. :)

doggman's picture
Joined: 02/17/2012
Posts: 48

Also, when your looking for a power supply, get one that is a good brand. Brands like Corsair, Silverstone, Antec and others.

3dGameMan's picture
Joined: 12/31/2000
Posts: 5401

I'd go 100W over recommnded. just to be safe. So in your case, go with a brand name 800W+ PSU.

Rodney Reynolds,