Mining Rig with SAPPHIRE 100311-3L Radeon HD 6970 2GB

[aakashkumar]

I have Plan to Build Mining Rig With  4*SAPPHIRE 100311-3L Radeon HD 6970 2GB
and i have few questions ,
1. Can I crossfire 4*6970  Here the link http://www.newegg.com/Product/Product.aspx?Item=N82E16814202035
2. Am expecting 1600Mhash/s or kHash/s
some specifications :
 SAPPHIRE 100311-3L Radeon HD 6970 2GB 256-bit GDDR5 PCI Express 2.0 x16 CrossFireX Support Video Card
 core clock : 880MHz
  Memory :   5500MHz

please Post your suggestion , have to order Today 

[darksoft]

Use 7950s, lower power, faster cards. Crossfire does nothing for you. And you should be getting better hashing out of the 6970 - I get 475k-485k/scrypt on mine using stock numbers.

[aakashkumar]

7950 900MHz will give 520 kHash/s
but 6970  880MHz  will Give 400 kHash/s per Card  ? is this correct /
If i Cross fire 4X6970  , will i get 1600 kHash/s ?
is this correct ?

[SirMintALot]

Don't crossfire your cards, it will slow them down. Just put the four cards in your rig without crossfire cable attached.

[jamesc760]

I have a Sapphire 6950 and it does 450 Kh on average, stock no oc/uv. But it runs a bit hot, about 75 C at 60% fan in air-conditioned room. Oh, it eats electricity like a monster and makes noise like a monster too. Will never ROI anytime soon but I don't care about that.

[darksoft]

7950 900MHz will give 520 kHash/s
but 6970  880MHz  will Give 400 kHash/s per Card  ? is this correct /
If i Cross fire 4X6970  , will i get 1600 kHash/s ?
is this correct ?

You can pull 600k hash on a 7950 and higher plus it uses almost 100 watts less power per card.