Graphics Card: Not Enough Voltage?

May 16, 2011 at 15:32:07
Specs: Windows Vista
I recently purchased a Sparkle Calibre GTX 460 and found that i will have to return this card because my 750 W power supply didn't fit the minimum requirement of having a 12v Rating of 22 Amps. My power supply actually has a 12v Rating of 20 Amps. So i wonder, what are some graphics cards that are similar to the gtx 460 (in processing power) that will run on a 750 W power supply with a 12V rating of 20 Amps?

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May 16, 2011 at 15:43:54
Post the model number of your power supply. I think you must have more than 1 12V rail in that 750W PSU. It should be at least 40A or more.

Charts I found for 560 GTX show the maximum power draw of 268W which comes out to 22+ Amps on the 12V rail. That means you must have more than that if using a single rail PSU. The processor can draw between 65W & 140W itself. Then you have drives, the board itself, RAM, fans, etc. You need at least 40A on a single 12V rail or if your PSU has multiple rails the one used for the graphics needs at least 23A or more.

Look at the link below.

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May 17, 2011 at 13:32:28

My PSU is a Rosewill XTREME RX750-D-B. The MODEL NUMBER is "APE-900x PLUS (A/PC)" [don't know what A/PC means]. Bellow is the chart found on the side of the PSU:

AC INPUT 100V-240V 15/7.5A 47-63 Hz
DC OUTPUT +3.3V +5V +12V1 +12V2 +12V3 +12V4 -12V +5VSB
MAX CURRENT 24A 30A 20A 20A 20A 20A 0.5A 3.0A
Combined Power 170W(for 24A and 30A) 720W(60A[for the four 20A])6W(for 0.5A) 15W (for 3.0A)
729W (For all the amps except 0.5A and 3.0A)
Total Power 750W
Peak Power 850W/30sec

I guess I have 4 12 V rails, and each of them put out 20 A.
So now, looking at this chart, what cards within the GTX 460 range would fit my system?

Thank you so much for the help.

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May 17, 2011 at 13:43:56
I see no reason why that PSU can't handle your card since it has a combined 60A on the +12v rail. Did you even try the card?

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Related Solutions

May 17, 2011 at 14:08:04
The thing was that the 3.3 Voltage in the bios was 3.85 which was red (bad) and the computer was not stable (wouldn't always turn on even), so i thought it was clearly the power that was the problem.

When newegg says that the card has a "Minimum 450W or greater system power supply (with a minimum 12V current rating of 22A)" does that mean 12V rating for each rail, or a combined 12 V rating of 22A? Heres the link to the card btw:

The NEWEST review (under feedback) actually describes one of the problems i was having with the card, titled "Update" by tjatwood

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May 17, 2011 at 15:13:39

That card has a max draw of 22.5A@12V.

This is why you always preach about using single rail PSUs.

If there are multiple aux. power connectors on the card then you could use two of the rail outputs.

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May 18, 2011 at 13:17:06
So what should i do?

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May 18, 2011 at 14:42:14
Do you have TWO power connections on the card? If so, do you have them both connected?

According to the Manufacturers specs there are TWO 6 pin PCIe power connectors on that card.

According to the Rosewill specs for your PSU there are FOUR 6 pin PCIe connectors. They should be coming off of TWO different rails. If you currently have both connectors mated up, then try pulling off ONLY one and connect one of the 2 that were not in use.

Be sure the card is fully seated and the tang at the back is locked.

If the system still will not then you may need to either get another card or PSU. All the cards in that series pull about the same power so changing brands isn't going to help.

I assume the computer ran before buying this card? If not, then the problem may not be the card/ PSU at all.

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