460 GTX really needs two six pin?

because not all cards require two 6 pin connectors, some only require one... try a molex adaptor if you need it... btu in general i'd imagine if the psu only has 2 6 pins i'd question it actually being able to support two 460's

Yes you really need 2. Thats why they put 2 on the card.
And the electrical circuitry will not behave correctly without plugging both in.

The answer should be obvious, because plenty of Nvidia cards DO only need 1 connector.

You can buy Y connectors , like I did. Or just upgrade to a 4 pci-e cable psu  

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
sleeved
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

whell i was thinking this
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

To power two GTX460 but it has only two 6 pin, one is 8 pin breakaway.

Becase some cards only need 1 6pin, so you can SLI two cards

uhm

But can this psu go with 460 GTX? since it only has two 6 pin

The GTX 460 uses more power under load, but less at idle, than the HD5770. As much time as my computer is not in a game, it seemed like a worthwhile trade-off.

Yes but it also has 6 Molex connections and each of the 460's will usually come with at least one dual Molex to 6 pin adapter ! For example this MSI card comes with 2 adapters if you look at the last pic with the extras in it

A couple of years ago there were very few if any cards that required 2 6 pin connectors so the power supply manufacturers didn't anticipate the need to put the extra connectors on there. The adapters work fine if you have enough watts on the 12v rail. I've got 2 465's in SLI running on a 620w PSU, one uses the 2 6 pins and the other uses the molex adapters and I haven't had any issues yet.

Yes but if you want to SLI you will either need a new PSU or grab some molex to 6pin

Amm..NO. AMD rates the Radeon HD 5770 for 18W of power consumption at idle and 108W maximum board power at load. The gtx460 is rated at 20-30w at idle if i remember right and 160w at maximum load.

If you want to go sli, use the 6pin PCI-E power connectors from your PSU, one for each card and use the adapters that came with the cards for the second connection.

I am rather curious as to why someone would even bother to ask this question when all one has to do was look up the base power consumption of this card. 160w on reference clocks (with margin for give or take) with a max out over 200w. If you see a power connector it doesn't mean that it optional like a usb port or a serial port but is required for the normal operation of the card. Two power connectors equal that you need to hook up two power cable to ensure that the card works. Common sense seams to be all out the window these days no matter ware one is in this third dung heap from the sun.

The 5770 in general uses less power than the GTX460 but however it doesn't compete performance wise and putting a second in crossfire defeats the purpose when efficiency is in mind.

The GTX 460 BARELY needs more than one 6-pin connector, so they have two. An 8-pin would have likely carried enough power, except the specs for power supplies make 6-pin more common.

Anyway, since you only need a little more power than a single 6-pin provides, you can follow the suggestion of using a 4-pin "molex" to 6-pin adapter.

This generation of cards are all about even, very good at idle. Can't say the same about ATI's 48XX's  

Don't know the rest of your system, or if you're an overclocker, but you might want to consider a higher quality power supply if you plan to SLI a couple of 460's


BFBC2 caused a slightly greater power draw.

Thanks Notty, that (or one just like it) was the chart that came to mind. It's a tiny difference, but it's there.