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SLI GTX 260 power supply

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Last response: in Components
June 11, 2009 12:02:20 AM

I currently have an 850 watt thermaltake PSU and 1 PNY GTX 260. I'd like to add a 2nd card but my power supply only has 3-6 pin connectors and I need 4. I'm running the i7-920 with 1 HDD, 1 DVD drive, and 3 gigs of ram. Is it at all possible to add a 2nd card in w/o buying a new PSU?

More about : sli gtx 260 power supply

a b ) Power supply
June 11, 2009 3:50:03 AM

Your PSU has way more than enough power, you'll need to use a Molex to PCIe adapter (which should come with the card).
Related resources
June 11, 2009 10:39:19 PM

psu specs

- Wattage 850 Watts
- Fan 140 mm
1900 rpm ± 10%
Air Flow: 82 CFM
- Efficiency 85% +
- PFC Active PFC
- Hold-Up Time 16 ms
- Switches ATX Logic on-off additional power rocker switch
- Motherboard Connectors 24-pin Main Connector
4+4-pin Power Connector

- Power Good Signal 16 ms
- Form Factor ATX 12V 2.2
- Dimension 6.3 x 5.9 x 3.3 inch (L)x(W)x(H)
160 x 150 x 85 mm (L)x(W)x(H)
- Warranty 5 Years
- Certifications ATI CrossFire X Certified
80 Plus Certified
- Input Voltage 100 VAC~240 VAC
- Input Current 115 VAC / 10A max
230 VAC / 5A max
- Input Frequency Range 47 ~ 63 Hz
- Inrush Current
- Operating Range
- MTBF >120,000 hours
- Output Table
- Over Voltage Protection +5V trip point @ 7.0 Vmax
+3.3V trip point @ 4.5 Vmax
+12V trip point @15.6 Vmax

June 11, 2009 11:26:19 PM

Steezus said:
What about my Corsair 550VX PSU?

Is this PSU quality enough to actually support 2 GTX 260's?

The quality is irrelevant in this case. The power output is not enough to power 2 GTX 260s. The best 550W PSU or the worst 550W PSU still cannot produce enough power for two of these GPUs.
a b ) Power supply
June 12, 2009 12:22:38 AM

one-shot said:
The quality is irrelevant in this case. The power output is not enough to power 2 GTX 260s. The best 550W PSU or the worst 550W PSU still cannot produce enough power for two of these GPUs.

2 x GTX260 uses less than 220W, so how is 550 not enough?
June 12, 2009 2:08:25 AM

Considering Nvidia recommends greater than 650W for a GTX295, I wouldn't SLI 2 GTX 260s on my 650W PSU. Here is a very good article about PSU power consumption. I highly recommend you read it.

The high end PC has an i7 920 at stock speeds, 3x1GB DDR3, 1 HD and a GTX295.
The system drew 502.8 @ full load with i7 920 and a GTX295. I believe a 550W PSU may not be able to adequately supply power to the entire system for an extended period of time. This system was at full load with the GPUs and CPU both stressed. I wouldn't be so foolish as to use a small power supply running at near 100% when I could spend a few more dollars for a larger unit which can supply a larger amount of current. I agree that 1000W PSUs are pointless, but a 750W is not by any means. If you still strongly feel a 550W PSU can supply enough current, go ahead and do it. A power supply is the last component you want to cut corners with just to say that you "can" use a 550W PSU.
June 12, 2009 8:41:39 AM

I am already using the PSU. I love it. Best power supply I have ever owned. I was just wondering if people thought it would be worth it or not.

Sounds like I will just wait until the GTX 285 drops in price and replace the GTX 260 instead of just picking up a second one. I don't run high resolutions anyways, so the SLI wouldn't scale that well anyways. Would have been neat to try is all.
a b ) Power supply
June 12, 2009 4:48:13 PM

If you run a power supply that "supplies" enough power...... not one that's friggin "good" enough, everything will run as it should and things will run cooler. I've been down that road. Stop trying to cheapen things up by buying just enough..... it's a losing situation in the long run.
June 13, 2009 11:54:55 AM

There is no such thing that will always supply enough power. There is always a new card that makes old power requirements seem weak. 500 watts seemed extreme a few years ago. Then 750 was crazy to even think about, now 1,000 watts is getting to be the norm.

I have never had a PSU destroy a component from being overloaded, just BSD it and restart. So it doesn't seem like there is much harm in asking if anyone else has tried this before buying yet another soon to be outdated PSU.
October 24, 2009 7:21:57 PM

i have my two gtx260 runing in sli with my antec true power trio 550 w.. max amp 42amp .. no problems so far..

take at look

"If you wish to operate the GTX 260 OC in an SLI configuration, you will need a branded power supply with between 510 and 550 watts and 42 to 46 A on the 12 volt rail."