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Trifiring the 6770. Power supply math?

post #1 of 5
Thread Starter 
So I have been reading a lot about this trifiring thing, and I wanted to try it out using my 6770, see how it scales.

I've been trying to get a good read-in on how much power my system would require, but so far I'm dumbfounded.
According to a lot of people on the internet, it would need a 850+ PSU, while a silly PSU calculator sets me back no more
than 600-ish watts.
Combined with the fact that at peak load the 6770 consumes 148 watts keeps me quite confused.

Please do care to correct me on the math, but I have calculated the following according to factory specs:

i7-950 at full load = 255 (100%) (measured from the wall socket, so not quite as accurate)
6770 at full = 108 (148 peak)
x3 = 324 (444)
HDD 7200 rpm, 9.2watt
HDD 5400 rpm, 6 watt
SSD 1.5watt
String of red leds, 9.5 watt

8 or so fans (15-ish watt?? c.b.a. to take them out)
2x zalman fan controllers.7w + 7w = 14w

255 + 324 = 579 + 40.5 = 619.5 watts

If we look at peak, it seems it would come out at,
255 + 444 = 699 + 40.5 = 739.5 watts.

The latter would mean I would be crossing my PSU with 39.5 watts.

I don't expect my system to run at peak power any time soon, but should I stuff this third card inside, could this mean I could
damage my system indefinitely?

If anything, could anyone help me with the math?
Simple suggestions would be much appreciated also.
Edited by Audiogeek - 3/5/12 at 11:41am
    
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post #2 of 5
You would be fine with a 650w supply because the peak is probably even higher rated than 650w. Where you might want to reconsider is on efficiency. A well rated 80+ PSU will be good, but most PSUs are more efficient in their mid range. So with a 850w PSU you might stay in a higher wall-to-components wattage rating.
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post #3 of 5
Thread Starter 
Al right, thanks, it's quite a relief to hear that.

Right now I'm using the OCZ StealthxStream 2 80+ PSU.
It's efficiency will probably not be as great as I hope it will be, but I will be looking for an upgrade in the future anyway, I just had
to know if my current PSU would hold out till that day.

The downside is that my OCZ has 4 12v rails each worth 18a.
So I'm hoping my psu won't go haywire when I connect the 6770 to the 12V3 line where my HDD's, SSD, leds and 5.25 bays are connected to.
    
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post #4 of 5
figured I would link you to an old thread about tri-fire on the 6770. Some people say it's a waste and it kills scaling.

http://www.overclock.net/t/1189407/amd-hd6770-in-trifire
     
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post #5 of 5
Thread Starter 
I've stumbled upon that thread quite some times, actually, I found it quite informative.

Though, a review stating 3 5770's in cf outperforms an ASUS Ares convinced me to at least try it.
So, I'm basically crossing my fingers.
    
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