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Powercolor hd 4850 512 on delta 250 watt PSU !

Last response: in Graphics & Displays
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May 3, 2010 10:46:37 AM

Hello, my pc:

pentium d 3ghz( o.c to 3.8ghz ),
asus p5kpl-am,
transcend 2gb dd2 800,
powercolor hd 4850 512 ddr3,
delta 250 watt (peak 300 watt) psu, samsung 250gb hard drive.

i don't no how is it possible to run hd 4850 on 250 watt psu even with overclocked cpu without any problem. with full load cpu temp around 70 and gpu temp around 80. i have played crysis warhead, dirt2, bad company2 with high settings ( 1024x748 ) and got 22-40 fps and i am playing them for 6 days( average 6 hours per day)and there is no problem i have faced. can anyone explain me how is it possible or there any problem?
a b U Graphics card
May 3, 2010 11:11:35 AM

How did you connect this PSU to the 4850's 6 pin power socket?
May 3, 2010 11:34:42 AM

FunSurfer said:
How did you connect this PSU to the 4850's 6 pin power socket?



i use a 6 pin pci-e power converter/connector from PSU power cable and the reccomended power for this card is 450 watt. i am using delta 250 watt PSU without any problem. just anyone explain me is there any problem?
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a c 235 U Graphics card
May 3, 2010 12:18:46 PM

I have read DEll users running GTS 250 cards on their Dell 305w units (made by Delta)

don't know how long their PSU lasted or yours will....
a b U Graphics card
May 3, 2010 1:50:28 PM

How many amps do you have on the PSU's 12V rails?
This detail is more important than the PSU's wattage. A 300W PSU with 30A on the 12V rails is better than 650W PSU with 25A on the 12V rails.
If you have at least 25A than you are OK. If you have less than that your PSU is working under stress and may become damaged.
a c 125 U Graphics card
May 3, 2010 2:05:18 PM

FunSurfer said:
How many amps do you have on the PSU's 12V rails?
This detail is more important than the PSU's wattage. A 300W PSU with 30A on the 12V rails is better than 650W PSU with 25A on the 12V rails.
If you have at least 25A than you are OK. If you have less than that your PSU is working under stress and may become damaged.


The OP's PSU is only 250W so it can't possibly have 25A on the +12V rail

Say for example the OP's PSU has 250W and 230W dedicated to the +12V rail(s) the maximum Amperage the PSU could deliver would be 19A (230W Divided by 12 = 19)
a b U Graphics card
May 3, 2010 3:08:05 PM

Rustyy117 said:
The OP's PSU is only 250W so it can't possibly have 25A on the +12V rail

Say for example the OP's PSU has 250W and 230W dedicated to the +12V rail(s) the maximum Amperage the PSU could deliver would be 19A (230W Divided by 12 = 19)


So how can he play Crysis at high settings on 250w (and probably 16A on the 12V rails) PSU using OCed Pentium D and 4850? The mystery remains...
a c 125 U Graphics card
May 3, 2010 3:22:35 PM

FunSurfer said:
So how can he play Crysis at high settings on 250w (and probably 16A on the 12V rails) PSU using OCed Pentium D and 4850? The mystery remains...


I haven't got a clue to be honest.
May 5, 2010 6:00:05 AM

Rustyy117 said:
I haven't got a clue to be honest.



my 250 watt PSU has 19A on +12V1 and +12V2 rails and max output 300 watt ( peak)
a b U Graphics card
May 5, 2010 6:35:43 AM

mdumham said:
my 250 watt PSU has 19A on +12V1 and +12V2 rails and max output 300 watt ( peak)


For max output of 300W you can have 19A on +12V1 and 6A on +12V2 and you are using the converter cable so the 4850 gets 25A which is fine and explains how can you play Crysis at high settings. But running at peak all the time is not recommended.

If you have 19A on both rails and you used the coverter cable than your 4850 gets 38A and that is OK, but it doesn't sound logical for a 250W PSU.
a c 376 U Graphics card
May 5, 2010 10:00:54 AM

Even if it does work for the moment you are pushing that PSU beyond it's normal limits. Don't be surprised if doing so kills it fairly quickly.
a c 125 U Graphics card
May 5, 2010 10:49:52 AM

FunSurfer said:
For max output of 300W you can have 19A on +12V1 and 6A on +12V2 and you are using the converter cable so the 4850 gets 25A which is fine and explains how can you play Crysis at high settings. But running at peak all the time is not recommended.

If you have 19A on both rails and you used the coverter cable than your 4850 gets 38A and that is OK, but it doesn't sound logical for a 250W PSU.


Its not logical or possible

He can't possibly have 38A with a peak 300W PSU.

You could at peak have 25A (providing his PSU is brand new and theirs no capacitor aging), but his HD4850 wouldn't be getting the full 25A, because the motherboard, CPU, memory ETC... also have to run off the +12V rails, and so would be using up some of the Amps/watts.

I predict that the PSU will fail soon
a b U Graphics card
May 5, 2010 12:21:30 PM

Rustyy117 said:
Its not logical or possible

He can't possibly have 38A with a peak 300W PSU.

You could at peak have 25A (providing his PSU is brand new and theirs no capacitor aging), but his HD4850 wouldn't be getting the full 25A, because the motherboard, CPU, memory ETC... also have to run off the +12V rails, and so would be using up some of the Amps/watts.

I predict that the PSU will fail soon


Sorry, I ment 25A for the whole system.
25A is enough - for a PC that has dual core CPU, one HDD, 2 DVD-ROMs, 4 sticks of RAM and one GPU that has one 6pin power socket - to play Crysis at high settings. I know that because that's what I have on my PC, but I am not running on peak power all the time, so I too predict an explosion in the near future.

The OP wrote "my 250 watt PSU has 19A on +12V1 and +12V2 rails" which can be understood as 'my 250 watt PSU has 19A on +12V1 and 19A on +12V2' .

I
!