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Is my PSU powerfull enough for this graphics card ?

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  • Power Supplies
  • Graphics Cards
  • Components
Last response: in Components
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June 23, 2010 8:58:13 PM

Hi

I need a expert's opinion in this case.

This is my pc setup:

Motherboard: MSI k8mm-v
PSU : lc-b300atx
CPU : AMD Athlon 2800+ Newcastle
Memory: 2 * 512mb 400mhz modules
Graphics: Nvidia 6600
Samsung DVD-RW Drive
Floppy drive
Wireless Network Card
* The psu, cpu have a 80mm fans and theres a 92mm fan on the Nvidia 6600.

According to this PSU calculator this setup uses 248 Watt.
http://www.extreme.outervision.com/psucalculatorlite.js...

I have succesfully overclocked the cpu from 1800 @ 1.55 V to 2250 @ 1.57 V and the Nvidia 6600 from 350/550 to 450/651
My current overclocked setup uses about 270 Watt then.

I have the oppurtunity to get a x1950 pro.
With my cpu at stock speed and the x1950 pro , the system uses 282 Watt according to the PSU calculator.
If I plug the DVD-RW (which I rarely use) out then it is 256 Watt.

The PSU says the following:
15A on the 12V line
30A on the 5V line
28A on the 3.3V line
Max 180W on 15V line and Max 180W on the combined 5V and 3.3V line.
Total Max of 280W
* It will be nice if some-one could explain how they work out the 280W Max.

So, do you think I have enough power to plug in the x1950 pro at overclocked settings?
If not, do you think I have enough power for the x1950 pro at stock settings?
If not, do you think I have enough power if I unplug the DVD-RW at stock settings?

Only negative effect I have experienced while overclocking past 2000mhz was that my network card could not function properly.
It would start downloading with normal speed for 1 sec and then suddenly drop to 10 bytes/sec speed.
Could this be because it is under-voltaged at my overclocked settings?

More about : psu powerfull graphics card

June 23, 2010 9:36:00 PM

Base on the age of that system the bus is what you accelerated, too fast for the network card to function, simple.
Maximum 180w output on the 12v/5v/3.3v combined is 180/12= 15amp.
With an efficency level estimate of 70% or less 15x0.7=10.5amps
Without double checking estimate of 1950 power requirement is 8amps minimum with an available 6 pin pci-express cable leaving 2.5amps for rest of 12/5/3.3.
Doesn't look good, with or without a dvd, only good news is that older system isn't relying on the 12v line like anything from this century.
I suspect it may come on but it's likely to blow really quickly and may of may not take out system components other than the psu.
You can get a Corsair 400w psu for about 29.99 after rebate which has about 32-34amps on the 12v line.
Also I kind of doubt your current system is drawing anything near 248w, maybe closer to 175, then again maybe your calculation is based on something just not listed here. good luck
June 23, 2010 10:38:34 PM

I have done abit of reading around.

Seems like you need 18 or 22 amps minumum on the 12V line.
I don't think I will be able to handle this card.

I used Clockgen to overclock, and disabled pci/agp overclocking.
Will the faster bus speed still be problematic for the wireless network card?

I can get the AGP x1950 Pro.
Will that make any difference ?

If I run PC Wizzard 2010 , I get the following voltage readings:

3.23V on the 3.3V line.
5.05V on the 5V line.
12.10V on the 12V line.

Does that mean anything to you ?
This is at stock settings.
a c 243 ) Power supply
a b U Graphics card
June 23, 2010 11:21:25 PM

roonj said:

Maximum 180w output on the 12v/5v/3.3v combined is 180/12= 15amp.
With an efficency level estimate of 70% or less 15x0.7=10.5amps
Without double checking estimate of 1950 power requirement is 8amps minimum with an available 6 pin pci-express cable leaving 2.5amps for rest of 12/5/3.3.
Also I kind of doubt your current system is drawing anything near 248w, maybe closer to 175, then again maybe your calculation is based on something just not listed here. good luck

Max combined is claimed to be 280 watts.

The efficiency rating doesn't decrease the psu's DC output.
With an efficiency factor of 70% the psu would need to draw 400 watts from the wall ( AC ) in order to provide the 280 watt max it claims to be capable of.

The PSU calculator doesn't tell power consumption, it give's a reccomended psu wattage for the components that are input.
!