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I was told I needed a new power supply but do I really ?

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  • Power Supplies
  • SLI
  • Components
Last response: in Components
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October 15, 2011 6:31:54 PM

My Computer is as of 10/13/11

Motherboard is: ASUS, M2N32-SLI, Deluxe
AMD Socket, AM2+/AM2
NVIDIA nforce 590 SLI
2xPCI-E x16 Slot,Nvidia SLI Support, At Fullx16x16 Speed
Dual Channel DDR2 800/667/533 Memory/Ram
Bios updated 5/3/11 to 5002

CPU/Prossesor is: AMD Athlon 64x2 Dual Core Processor 6400+

P/S is a: Ultra Xfinity Dual Rail Technology 600 Watt. ATX, SLI ready

Ram/Memory is:
Total Memory is : 3070MB
4 sticks total
2 sticks are: 1024MB,667mhz(speed) 64bit
2 sticks are: 512MB,667mhz(speed) 64bit

2 Hard Drives:
Maxtor S TM3200820AS SCSI
WDC WD32 00AAKS-00B3A

DVD/CD Drives:
TSSTcorp CD/DVDW SH-S182D
ASUS SDRW-08D1S-U USB

Grafix Card: PNY Nvida 550Ti

Sound Blaster Sound card

Monitor is: ASUS 24" HD Running at 1920x1080px32

OS is: Windows XP

So with the: Ultra Xfinity Dual Rail Technology 600 Watt. ATX, SLI ready Power supply. Do I need to buy a new power supply to upgrade to running 2 Geforce 550 Ti's in SLI mode ? and sometime I would like to upgrade to the biggest, baddest AMD Phenom ll Quad Core CPU that my Mobo will support. I'm a little tight on cash at the moment. So I would like to buy just another Geforce 550 ti and be done with it until I have more money. I was running 2 PNY Geforce 9800GT's in SLI mode and everything seemed worked fine.

More about : told needed power supply

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October 15, 2011 6:47:40 PM

heh, for a minute there I thought you wanted to run two 590's in SLI on a 600W PSU, then I realized you were listing out the motherboard specs.

Anyways, the 550Ti has a TDP of 120W, so two would be 240W. The processor has 125W TDP. Not including anything else that would draw 12V you need at minimum 365W on the 12V rail.

If I found the correct PSU online, your PSU can put out 38A on two rails. That is 38*12 = 456W. I would say it should be safe so long as you don't OC the processor.

Based on the review I read, the Ultra X-finity is a quality PSU so you shouldn't have to worry about it actually putting out what it claims it can.
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October 15, 2011 6:57:10 PM

continuing on from nordlead above

remember watts= volts*resistance


e.g watts=V*A
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October 15, 2011 7:11:02 PM

kegga 62 write
Do I need to buy a new power supply to upgrade to running 2 Geforce 550 Ti's in SLI mode ?
well pny recommend a 400 watts psu with a 24 amp for single card so if you run two in sli could be out of power
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October 15, 2011 9:20:53 PM

shanky887614 said:
continuing on from nordlead above

remember watts= volts*resistance


e.g watts=V*A


Just to prevent any confusion that isn't quite correct. watts = volts * amps, so your second equation is correct.

Ω (Omega) is the character for resistance. Ω = V / A.
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October 16, 2011 5:24:26 AM

Best answer selected by kegga62.
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October 16, 2011 5:26:04 AM

nordlead said:
heh, for a minute there I thought you wanted to run two 590's in SLI on a 600W PSU, then I realized you were listing out the motherboard specs.

Anyways, the 550Ti has a TDP of 120W, so two would be 240W. The processor has 125W TDP. Not including anything else that would draw 12V you need at minimum 365W on the 12V rail.

If I found the correct PSU online, your PSU can put out 38A on two rails. That is 38*12 = 456W. I would say it should be safe so long as you don't OC the processor.

Based on the review I read, the Ultra X-finity is a quality PSU so you shouldn't have to worry about it actually putting out what it claims it can.



That's pretty much What I thought. It's a dual rail PSU I thought it would handle 2 550 Ti's okay. Thanks.
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