7850 or 7870? Is the extra cost worth it?

[superarthur]

I am thinking of building a new rig for mining, but don't want to spend too much.
I am deciding between a 7850 or 7870. Of course the 7870 is faster, but is the extra cost worth it?
On a side note, it'll be used for gaming as well. Would an i3 3220 CPU be enough? (My other option would be AMD FX 6300, but i3 is slightly cheaper with a cheaper B75 motherboard, with a lower power consumption)

Thanks for your time reading my post. =]

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[Acesbomb]

I get about 360 mhash from my HD7850. Over 700 each with my 7970s. To put in perspective.

[rograz]

From what I've heard there are a lot of 7850s with limited voltage control while most 7870s are more generous in that aspect if it matters.

[c0ikws]

I get 420 mhash with sapphire and Asus 7870

[superarthur]

420/360 mhash is a 17% increase.
7870 is about £180, and 7850 is about £150, which is a 20% increase.
But factoring in other costs, the % difference in price will be lower than that.

[mobile4ever]

I get 420 mhash with sapphire and Asus 7870

How many watts does it pull under full load?

[c0ikws]

Around 150 Watt, this card doesn't consume much power compared to 5850 hehe

http://www.techpowerup.com/reviews/ASUS/HD_7870_Direct_Cu_II/24.html

[mrSprinkles]

Just chiming in with what my 7850 gets:
382Kh/s 1100/1250/I=19

[btcminer021]

I get about 360 mhash from my HD7850. Over 700 each with my 7970s. To put in perspective.

Can you post your miner settings and OC settings? I'm stuck at 340Mh/s

1200MHz core, 1300MHz memory, 1.18V