Crossfire for mining?

[aceman1011]

I am new to mining and am building my first rig. I have chosen the Radeon 5830 card for its low price and high hashrate, and was wondering if I could effectively double the hashrate by connecting two cards using crossfire connectors. Would this lower the performance compared to using to separate PCI slots on the motherboard? Thanks!

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[ataranlen]

You would still need to use separate PCI-e slots on the motherboard and separate PCI-e power connectors. Crossfire does decrease performance, but it works without Dummy plugs. Take your pick

[Chucksta]

Crossfire decreases performance.

[ataranlen]

Crossfire decreases performance.

Not by a whole lot though, for me, The decrease was about 1%

[aceman1011]

Alright, thanks guys.

[BitCointransfers]

I run 4x5830 Sapphires with no dummy load on the video connectors and it works fine..... Ubuntu 11.04....

[Xer]

Crossfire decreases performance.

Not by a whole lot though, for me, The decrease was about 1%

i have massive losses when using crossfire and mining with 6950's. Mining speed keeps varying between 200-430 on my cards instead of beeing stable at 430 with crossfire off.

[smooth]

I run 4x5830 Sapphires with no dummy load on the video connectors and it works fine..... Ubuntu 11.04....

The dummy plug is only needed on Windows, not Linux.

[aceman1011]

Lol, Crossfire and dummy plugs don't matter in Linux. This would be on Windows XP though. From the replies I'm just going to turn CF off and use dummy plugs.