Sign in with
Sign up | Sign in
Your question

Radeon 6770 power draw psu ?

Last response: in Graphics & Displays
Share
November 15, 2011 4:55:29 AM

Hi
I have a question about radeon 6770 and my PSU. i have Quoltec SilentLine 520W with +3.3v-33A; +5v-33A; +12v-20A; -12v-0.5A and 5Vsb-2.0A, intel i3 540-3.06 ghz, 4gb dd3 ram-2 sticks,1 hdd and thats all. Nothing is overclocked and i dont intend to. Will the radeon run on this PSU normal ? including that he will draw some power from pci slot and from +12v ? cause 12v is oblivously not enought but i am not strong in this energy, power etc things =(
a b U Graphics card
November 15, 2011 5:01:35 AM

If you know the power usage of the card, in watts, it's very easy to find the amps used. Since you have 20 amps on the +12V rail, you can only use a total of 240 watts, no more. That 240 includes the processor, HDDs, and everything else, leaving you with about 150 watts for the video card.

The basic formula is "Volts*Amperes = watts". If amps is unknown, then, doing basic algebra, you get "Watts/Volts = Amperes".

Edit: the 6770 should work quite well, unless you intend on overclocking or using CrossFire.
Related resources
November 15, 2011 5:09:30 AM

ulillillia said:
If you know the power usage of the card, in watts, it's very easy to find the amps used. Since you have 20 amps on the +12V rail, you can only use a total of 240 watts, no more. That 240 includes the processor, HDDs, and everything else, leaving you with about 150 watts for the video card.

The basic formula is "Volts*Amperes = watts". If amps is unknown, then, doing basic algebra, you get "Watts/Volts = Amperes".

Edit: the 6770 should work quite well, unless you intend on overclocking or using CrossFire.



great =) and how much power will be left on +12v line ? it wont be at his peak 240 watts? asking i case of safety
November 15, 2011 5:16:05 AM

or maybe i should go for gts 450 ? and leave the radeon alone ?
i forgot to mention that my PSU has 6 pin connector, dunno if this help
a b U Graphics card
November 15, 2011 6:14:15 AM

get 6770 OC/GTX 550 Ti OC are good.
GTS 450 slower then GTX 550 Ti
November 15, 2011 7:15:58 AM

For reference I have the 6750 on an amd system over clocked athlonIIx2 on a antec earthwatts 430 PSU.

I'm nowhere CLOSE to straining my supply.
You should be good All good.

Rail Information below.
+5V 20 A
+3.3V 20 A
+12V1 17 A
+12V2 16 A
-12V 0.8 A
+5VSB 2.5 A
a c 104 U Graphics card
November 15, 2011 7:40:43 AM

Your psu is definitely better ; it has more than 24 amps combined on the two rails.
If the op only has one rail with 20A it would be very close and maybe not safe, not sure, no psu expert.
November 15, 2011 3:19:14 PM

just got an answer from nvidia technical support about gts 450 power needs. The answer was that my PSU is good
This are his words

""Your power supply appears to be sufficient for the Geforce GTS 450. ""
r
adeon 6770 and gts 450 have the similar power needs?
November 16, 2011 6:56:47 AM

GreenDutchAlien said:
Your psu is definitely better ; it has more than 24 amps combined on the two rails.
If the op only has one rail with 20A it would be very close and maybe not safe, not sure, no psu expert.


my psu may be better but when I check the raw wattage displacement on my system I'm not even CLOSE to it. My system counting my desk lamp and Monitor is in the 200 watt range, measured by the wall.

My guess is the the i3 isn't to far off from my processor and that even under load his whole system won't stress even the 1 20A rail.

Though if he is looking to spend 100$ plus on a video card maybe he should upgrade the PSU. Mine as less than $30 shipped from newegg.
November 16, 2011 10:42:26 PM

I will buy the 6770
the next question is like this
Stock Effective Memory Clock is 4800
I found a card where it is down to 4000
Asus EAH6770 DC/G/2DI/1GD5
how much power will my 6770 lose ? i was searching for some tests, but didnt found any =(
a c 104 U Graphics card
November 17, 2011 4:43:14 AM

I wouldn't want that one. Maybe you can oc it to stock level, but there's probably a reason for lowering memory speeds.
I saw others with stock speeds even cheaper than the Asus.
Where do you buy from ? ( if you can provide a link )
!