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Need help with Radeon 6770 power requirements

Last response: in Graphics & Displays
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September 10, 2012 6:03:24 PM

need help urgent guys !

I'm planning to buy a Radeon 6770, but here is the deal...
I have a local 450w PSU with 19A on +12v line,

so my question is, how much watt my PSU will provide on 19A(+12v) ?
will I be able to run 6770 with it ?

My other spec..
Processor : Athlon II X3 445 (95w)
Mobo : Asus M4A78LT-M LE
RAM : 4 GB DDR3 1333 MHz
Monitor Res : 1366 x 768

thanks in advance :ange: 
a c 108 U Graphics card
September 10, 2012 6:11:16 PM

19 x 12 = 228 watts

This is a bit low for a 450 watt power supply seeing as how my 300 watt units has 22 amps(264watts). It runs a 5770/6770 with an I5 750.

What is the exact model of this power supply
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September 10, 2012 6:17:02 PM

Thats too low I would say. max draw of 6770 is about 100 watts give or take, so you have approx 120 spare for cpu at 95w, which gives you almost no headroom and you will be running the PSU at 80-90%.

Even for decent PSUs this is never a good idea due to reducing efficiency etc, and your PSU has low amperage on its 12v rail compared to its overall rating, suggesting it is quite old/cheap unbranded unit.
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a c 108 U Graphics card
September 10, 2012 6:18:46 PM

burgessanthony said:
Thats too low I would say. max draw of 6770 is about 100 watts give or take, so you have approx 120 spare for cpu at 95w, which gives you almost no headroom and you will be running the PSU at 80-90%.

Even for decent PSUs this is never a good idea due to reducing efficiency etc, and your PSU has low amperage on its 12v rail compared to its overall rating, suggesting it is quite old/cheap unbranded unit.

You can't be any more right!

Either that or a multi-rail without a rail being listed.

On the flip side if the quality is decent(i am doubtful with a 450 watt units that has less power then a 300 watt unit.)
My 300 watt unit has been fully tested to not take much over 170 watts with the 5770 and under volted cpu :) . Thats with Prime95 and Just Cause 2(game alone came in at about 140).


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a c 191 U Graphics card
September 10, 2012 6:22:14 PM

That isnt a very good power supply.
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a c 108 U Graphics card
September 10, 2012 6:27:24 PM

God no. I would replace it.

Too close to be safe and a power supply that is very old(design wise).

You do not need 500+ watts or anything any good 350-450(Seasonic, Antec, OCZ, Corsair, XFX, FSP in no particular order. Sure i missed some others) is recommended. More is optional(less may work, but I do not want to draw that line.)
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a c 191 U Graphics card
September 10, 2012 6:32:06 PM

Lol 45a on the 5V.
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a c 108 U Graphics card
September 10, 2012 6:34:12 PM

Deemo13 said:
Lol 45a on the 5V.

Who does not have 225 watts of USB/SSD stuff :) 

@ op

Old hardware was more heavy on 3.3 and 5. New is heavy on 12

So that power supplies days are numbered.

Also that was a nice way to increase the "Total Power" number on cheap power supplies.
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September 10, 2012 6:39:32 PM

so no hope unless I change my PSU ? :( 
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a c 108 U Graphics card
September 10, 2012 6:47:53 PM

I would not count on it. Even tho in theory alone you may be able to pull it off. That is a very old style power supply(or sold to sound powerful.)

Just off as an example. A modern 850 watt power supply has half as much 5 volt wattage as yours. This is because most of the power is not going to the 12 volt rail(s).

Another side effect of suck an old design is it makes more heat so it runs hotter and may not last as long.

If you are on a budget, I would look at the corsair builder series(CX) and Antec VP series.

Example. Canada. depending on your location, you will have other shops.
CX 430 28(336 watts) amps @ 12 volts
http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...

Antec VP 450. 30(360 watts) Amps @ 12 volts
http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...

Best case it may run for a bit then one day just fail. Worst case it fries the system when it fails(this is a common issue with lower grade power supplies).
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September 10, 2012 7:49:16 PM

@sbsixth: Yes that will do. Incase you live in any of the metros check at the local computer hardware market too. The newer HD7770's are selling at around 8k locally which will make for a much better buy. In any case that PSU will handle the HD 6770 with ease.
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a c 191 U Graphics card
September 10, 2012 7:50:21 PM

That's pretty good.
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September 12, 2012 6:38:12 PM

just for information, my total system power consumption on 100% CPU load is 108w..
so at least, will a 5750 will be good on my current PSU or 7750 ?
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a c 108 U Graphics card
September 12, 2012 11:07:45 PM

A 7750 uses less and runs faster in most games.

If the power supply will deliver its rated power then maybe. I still tend to recommend on the side of caution in this type of thing.

The 7750 is literally a worst case scenario 50 watt(MAX vs about 70-75 for a 5750) card.
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September 16, 2012 1:28:35 PM

bought 6770 & using dual SMPS now, no problem so far...thanks guys..
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!