- Aug 17, 2009
- 11
- 0
- 18,510
Good day everyone.
I am going to get a new HD4850, but before proceeding with it I did the research to see if my power supply can handle it.
Even after all the readings I did, I am still not confident, so I want to check it up with the community. Here is the situation with
my current PSU.
Brand: LC Power
Product code LC6550
Quoted power
Continuous power 550 W
Max. current 12 V - Rail 1 16 A
Max. current 12 V - Rail 2 18 A
The following tests were done on the 12V rails :
Measured voltage 12V1 rail
4 A load (= 50 W @ 12 V) 12.15 V
8 A load (= 100 W @ 12 V) 12.03 V
12 A load (= 150 W @ 12 V) 11.93 V
16 A load (= 200 W @ 12 V) 11.83 V
20 A load (= 250 W @ 12 V) 11.75 V
24 A load (= 300 W @ 12 V) 0
28 A load (= 350 W @ 12 V) 0
32 A load (= 400 W @ 12 V) 0
36 A load (= 450 W @ 12 V) 0
40 A load (= 500 W @ 12 V) 0
Maximum load 12V1 (+3/4) within 5% margin : 21 A
Measured voltage 12V2 rail
4 A load (= 50 W @ 12 V) 12.09 V
8 A load (= 100 W @ 12 V) 11.94 V
12 A load (= 150 W @ 12 V) 11.82 V
16 A load (= 200 W @ 12 V) 11.71 V
20 A load (= 250 W @ 12 V) 0
Maximum load 12V2 within 5% margin 18 A
So on Rail V1 there are 21 A at maximum load, and as far as I know, HD4850 requires at least 18 A. Also, the PSU is listed at
over 80% efficiency, but I had it for about two years now and if I am not mistaken, over time, the capacity drops due to
wearing down of the component. Now, I have calculated total Watts usage and that should be fine, but I am concern about
not providing an extra amperage to the rail so that the card can run without having to starve for power.
If someone could shed a bit more light if my concerns are adequate? Especially the two-rail thing is not completely clear to me,
basically does this means that if needed the combined can be supplied to one of the rails, or the 21A max is all there is to the V1 ?
Thank you in advance.
I am going to get a new HD4850, but before proceeding with it I did the research to see if my power supply can handle it.
Even after all the readings I did, I am still not confident, so I want to check it up with the community. Here is the situation with
my current PSU.
Brand: LC Power
Product code LC6550
Quoted power
Continuous power 550 W
Max. current 12 V - Rail 1 16 A
Max. current 12 V - Rail 2 18 A
The following tests were done on the 12V rails :
Measured voltage 12V1 rail
4 A load (= 50 W @ 12 V) 12.15 V
8 A load (= 100 W @ 12 V) 12.03 V
12 A load (= 150 W @ 12 V) 11.93 V
16 A load (= 200 W @ 12 V) 11.83 V
20 A load (= 250 W @ 12 V) 11.75 V
24 A load (= 300 W @ 12 V) 0
28 A load (= 350 W @ 12 V) 0
32 A load (= 400 W @ 12 V) 0
36 A load (= 450 W @ 12 V) 0
40 A load (= 500 W @ 12 V) 0
Maximum load 12V1 (+3/4) within 5% margin : 21 A
Measured voltage 12V2 rail
4 A load (= 50 W @ 12 V) 12.09 V
8 A load (= 100 W @ 12 V) 11.94 V
12 A load (= 150 W @ 12 V) 11.82 V
16 A load (= 200 W @ 12 V) 11.71 V
20 A load (= 250 W @ 12 V) 0
Maximum load 12V2 within 5% margin 18 A
So on Rail V1 there are 21 A at maximum load, and as far as I know, HD4850 requires at least 18 A. Also, the PSU is listed at
over 80% efficiency, but I had it for about two years now and if I am not mistaken, over time, the capacity drops due to
wearing down of the component. Now, I have calculated total Watts usage and that should be fine, but I am concern about
not providing an extra amperage to the rail so that the card can run without having to starve for power.
If someone could shed a bit more light if my concerns are adequate? Especially the two-rail thing is not completely clear to me,
basically does this means that if needed the combined can be supplied to one of the rails, or the 21A max is all there is to the V1 ?
Thank you in advance.
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