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Can my HX850 handle three 6950s? - Page 4

post #31 of 55
OK for those who don't know how to use the calculator for 3 cards. The overall wattage is for the SYSTEM. So to get the wattage of 3 cards,
plug in your system with 2 cards, get the wattage.
Plug in your system with 1 card, get the wattage.
Subtract the wattage of the 1 card setup from the 2 card setup. ie. 2 card - 1 card for the wattage difference, that's the wattage of ONE card.
Take that wattage difference and add it to the 2 card system wattage. voila, you have the wattage for 3 cards
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post #32 of 55
Quote:
Originally Posted by Cha0s_Cha0 View Post

OK for those who don't know how to use the calculator for 3 cards. The overall wattage is for the SYSTEM. So to get the wattage of 3 cards,
plug in your system with 2 cards, get the wattage.
Plug in your system with 1 card, get the wattage.
Subtract the wattage of the 1 card setup from the 2 card setup. ie. 2 card - 1 card for the wattage difference, that's the wattage of ONE card.
Take that wattage difference and add it to the 2 card system wattage. voila, you have the wattage for 3 cards

you need a very high quality power supply to make the results reliable
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post #33 of 55
I ran 2 6950s and a 9800GTX+ on my HX850 with OCd 2600K. 9800GTX+ was folding for awhile too. No problems...
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post #34 of 55
Quote:
Originally Posted by raclimja View Post

you need a very high quality power supply to make the results reliable

The HX850 is oozing quality. If that's not quality I don't know what is. Oh and your post makes 0 sense.
post #35 of 55
Quote:
Originally Posted by raclimja View Post

you need a very high quality power supply to make the results reliable

What does the quality of the power supply have to do with how much power your system draws? PSU quality really only dictate 2 things that most people look at.
1. The efficiency (has nothing to do with system draw)
2. Build quality (ie. If it'll blow up or not, again, nothing to do with system draw)

If it has enough wattage and amperage for the system then it's golden (not counting stupidly overrated psu's that can't handle their rated wattage) and once again, nothing to do with the actual system draw which is completely independent from the psu. The only factor the psu has in power draw is how much you take from the wall vs. how much you use (see #1)
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post #36 of 55
Quote:
Originally Posted by Cha0s_Cha0 View Post

What does the quality of the power supply have to do with how much power your system draws? PSU quality really only dictate 2 things that most people look at.
1. The efficiency (has nothing to do with system draw)
2. Build quality (ie. If it'll blow up or not, again, nothing to do with system draw)
If it has enough wattage and amperage for the system then it's golden (not counting stupidly overrated psu's that can't handle their rated wattage) and once again, nothing to do with the actual system draw which is completely independent from the psu. The only factor the psu has in power draw is how much you take from the wall vs. how much you use (see #1)

result could vary depending on how efficient the power supply so if you are using an 80plus bronze or gold psu,

you cannot expect to have the same result on a 80 plus because it would consume more power to the wall therefore the result would be higher
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post #37 of 55
Quote:
Originally Posted by raclimja View Post

result could vary depending on how efficient the power supply so if you are using an 80plus bronze or gold psu,
you cannot expect to have the same result on a 80 plus because it would consume more power to the wall therefore the result would be higher

False. PSUs are rated at output not input.
post #38 of 55

Always fun to read PSU wattage requirement and personal intrepretations and opinions.

 

 

@OP,

 

You have to be very specific to get the specific answer.

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post #39 of 55
Quote:
Originally Posted by raclimja View Post

result could vary depending on how efficient the power supply so if you are using an 80plus bronze or gold psu,
you cannot expect to have the same result on a 80 plus because it would consume more power to the wall therefore the result would be higher

Again, efficiency has nothing to do with system draw. If let's say your system draws 500 watts.
If you have an 80% unit then you'll be drawing 625w from the wall
If you have a 90% unit then you'll be drawing 555w from the wall
In both scenarios the system is drawing the exact amount of power and an 80% 500w unit can handle as well as a 90% 500w unit. The only difference is your electricity bill
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post #40 of 55
good to go mate.
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