3870 and PSU

[x2 3600 rules sazakky]

I don't get this.
I have a generic 600watt PSU with a single 18amp 12volt rail. Yet it can run my 3870.

 

[imported_Kiwi]

Mine is running with a 500 watt TTGI (Super Flower) power supply, which is supposed to be a Fortron. All that AMD says is at least 450 watts for a single card.

 

[Keysplayr]

Originally posted by: x2 3600 rules sazakky
I don't get this.
I have a generic 600watt PSU with a single 18amp 12volt rail. Yet it can run my 3870.

Nowhere near enough juice. A single 12V+ rail with 18amps is way under what you need.
That's why they're called "Generic". All hype and no go.

You'll need at least another 10 amps on the 12V+ to be safe.
A good quality 450W from say Corsair would be fine.

link

 

[BTRY B 529th FA BN]

On the contrary, I have a 500w Enermax Liberty who's specs are:

+3.3V 28A
+5V 30A
+12V1 22A
+12V2 22A
-12V 0.6A
+5Vsb 3A

and it runs my 8400 machine fine. Which has 1 Raptor & 3 storage drives & about 6 fans and a Creative sound card... no problems so far (knocks on wood) as a matter of fact, since I got this 80% efficiency PSU my electric bill dropped 20$

 

[Keysplayr]

Originally posted by: BTRY B 529th FA BN
On the contrary, I have a 500w Enermax Liberty who's specs are:

+3.3V 28A
+5V 30A
+12V1 22A
+12V2 22A
-12V 0.6A
+5Vsb 3A

and it runs my 8400 machine fine. Which has 1 Raptor & 3 storage drives & about 6 fans and a Creative sound card... no problems so far (knocks on wood) as a matter of fact, since I got this 80% efficiency PSU my electric bill dropped 20$

Good PSU, but on the contrary to what?

 

[x2 3600 rules sazakky]

Originally posted by: keysplayr2003

Originally posted by: x2 3600 rules sazakky
I don't get this.
I have a generic 600watt PSU with a single 18amp 12volt rail. Yet it can run my 3870.

Nowhere near enough juice. A single 12V+ rail with 18amps is way under what you need.
That's why they're called "Generic". All hype and no go.

You'll need at least another 10 amps on the 12V+ to be safe.
A good quality 450W from say Corsair would be fine.

link

then how the hell does the card work