Originally Posted by Colorful Dan
I can spend as much as I need to, my personal friend told me 750 should be good too, but there's always that small part of me that's nervous and doesn't want to waste time and money having to upgrade again...
When I review my calculations, a quality-made 750W seems perfect for overclocking the 7970s:
With two 7970s under full load in their system, their PSU pulled 567W from the wall outlet. Their CPU was idling, so I have to add 150W for a 3770K at 5 GHz under full load. So adding 150W to 567W makes the PSU pulling 717W from the wall outlet, and so if the PSU is 85% efficient while pulling 717W from the wall outlet, then the system is pulling 609W from the PSU. This is unrealistically high because I'm saying the 7970s and the 3770K are completely maxed out simultaneously, plus I'm saying the 3770K is at 5 GHz and pulling 150W. Your actual gaming load will be about 500-525W on average. Therefore, a quality-made 650W would keep your average power draw right in the sweet spot which maximizes your PSU's efficiency.
So, a nice 750W PSU leaves plenty of room.
Originally Posted by Whalemeal
X750 is 89.99 AR now. I'm using this PSU now and am very happy with it. I'm running 3930K at 4.6GHz and two GTX 670 SLI OCed at 1240MHz in water cooling.
It's a bit old model (I think seasonic replaced this withnew X760 for some reason...) but still this is a good deal.
Also, I can guarantee (believe it or not...) that you will have no problem with 750W power.
Omg, I didn't notice the Promo code! Holy [beep]!
Originally Posted by obsidian86
20% promo code puts it at $141 shipped
currently codes on quite a few units
the 850 kingwin plat is at $146 shipped which is a better deal if he wants to
Yeah, but that's still $141 vs. $89.99 for the X-750.
Meh, not when you can get the X-750 for $89.99!
Originally Posted by adridu59
It's 85%, where did you get that 50%?
Either from other people, or from this article below. lol
On PSU Efficiency
Either way, I think it all stems from this article.
Here's what people aren't reading but should:
PSU "50% Load" Myth