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Old 01-04-2010, 02:47 PM   #1 (permalink)
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Default 5850 and 2x 5850 in crossfire (PSU)

hello i wonder if this psu will be fine running 5850 single card or 2x 5850 in crossfire. also if there are correct cables for it

OCZ ModXstream Pro 700watt
https://www.overclockers.co.uk/showp...odid=CA-032-OC
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Old 01-04-2010, 03:02 PM   #2 (permalink)
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Default Re: 5850 and 2x 5850 in crossfire (PSU)

Quote:
ATI Radeon™ HD 5850 System Requirements

* PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard
* 500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in dual mode)
ATI Radeon? HD 5850 System Requirements

only 2pci-e connectors so you would need some adapters to run crossfire.

Quote:
PCI-Express Connector 1 x 6-Pin, 1 x 6+2-Pin
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Old 01-04-2010, 03:06 PM   #3 (permalink)
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Default Re: 5850 and 2x 5850 in crossfire (PSU)

I don't suggest using adapters.

Should be fine with one 5850, until your ready to buy a psu with enough native connectors.
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Old 01-04-2010, 03:18 PM   #4 (permalink)
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Default Re: 5850 and 2x 5850 in crossfire (PSU)

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I don't suggest using adapters.

Should be fine with one 5850, until your ready to buy a psu with enough native connectors.
why you dont suggest an adapter to run xfire?


Quote:
Quote:ATI Radeon™ HD 5850 System Requirements

* PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard
* 500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in dual mode)

ATI Radeon? HD 5850 System Requirements

only 2pci-e connectors so you would need some adapters to run crossfire.

Quote:PCI-Express Conne
what kind of adapter? but the power of this psu should be just fine to run whether single or xfire 5850?

cables are included when you buy a retail 5850 right? so i can use those to run a crossfire in the future?
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Old 01-04-2010, 04:25 PM   #5 (permalink)
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Default Re: 5850 and 2x 5850 in crossfire (PSU)

Using adapters increases resistance and places additional load on the rail being used, in which case you may be drawing power from the same lines that are powering the hard drives or optical drives.

Its much safer to have a power supply with the connectors already in place.
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Old 01-04-2010, 06:18 PM   #6 (permalink)
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Default Re: 5850 and 2x 5850 in crossfire (PSU)

Much better to not use adapters but, you would need a molex to 6-pin adapter. Most cards come with them as well.

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Old 01-04-2010, 06:21 PM   #7 (permalink)
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Default Re: 5850 and 2x 5850 in crossfire (PSU)

i see, seems that adapter is included in 5850 retail and do I really need to connect the two cables coz there are two power socket on 5800 series.
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Old 01-04-2010, 06:30 PM   #8 (permalink)
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Default Re: 5850 and 2x 5850 in crossfire (PSU)

A single 5850 will be fine, by the time he needs to upgrade it will probably be better idea to buy a newer single video card.

Either way.

I still firmly believe that if you want a multi card setup, the power supply should have the native connectors.

Not my choice though.

A single 5850 needs two 6 pin PCIE, which the PSU has, so you won't need the adapter with one card.
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Old 01-04-2010, 07:02 PM   #9 (permalink)
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Default Re: 5850 and 2x 5850 in crossfire (PSU)

should i just go for 5870 than 2x 5850 in crossfire?
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Old 01-04-2010, 07:04 PM   #10 (permalink)
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Default Re: 5850 and 2x 5850 in crossfire (PSU)

You can, or you can wait a few months to see how prices drop or what new products come.

But the 5850 would be fine for quite awhile.
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