HD 5870 vs HD 4870 CROSSFIRE

If you want keep the gold medals about the performance, go buy HD 5970

Consumption 2*HD 4870 : 206 watts (iddle) and 556 watts (load)
Consumption HD 5870 : 144 watts (iddle) and 326 watts (load)

keep your HD 5870 moreover X-fire HD 4870 it's very noisy
 
According to TOM: http://www.tomshardware.com/reviews/best-gaming-graphics-card,2544-5.html

Two Radeon HD 4890 cards should, on average, perform on par or better than a single GeForce GTX 295, and will definitely beat out a single Radeon HD 5870. Plus, these Radeons cost less than either option. If you have a CrossFire-compatible motherboard and want some serious performance at high resolutions, this route is the way to go.

Hence, I guess 2xHD4870 should at least perform on par with HD5870 if not better.
 
With the new drivers that ATI is promising, you might be able to CF the 5870 with the 4870... that's still a ways off, but something you might think about.
 

Abit if he beats my performance since i spent 600 on the 5870 and he spent like 90 on his second card..
 

Mine are
i7 920 oced t 3.4ghz (notctua nh u12p)
6gb ddr3 ram 1033mhz 7-7-7-16
1tb 7600rpm hdd
gigabyte ud4p mobo
powercolor hd 5870
cm storm sniper
pc power n coolng 750 watt

His
amd phenom ii 965 be (3.4)
4ddr2 800mhz
some gigabyte mobo
HD 4870 crossfire
itb 7600rpm
unknown case
750 watt psu
 

actually just read an article saying that ATI is working on a driver that will allow you to crossfire different generations of GPUs (I believe in CPU or Maximum PC)
 
Yeah I read that article too, on more than one site.

Looks to be a ways off, but they are promising a lot more than I'm willing to expect.
 
I recommend two 4870s if you want performance and bang for the buck, if you want efficiency and got a bit more money to burn, 5870 should be your choice. If you want Eyefinity, 5870.
 


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That's total system power, the 5870 is supposed to draw only 27W in idle.
http://www.anandtech.com/video/showdoc.aspx?i=3643&p=26
So 141-27 = 114W of system total.
4870X2 - 204-114 = 90W at idle.
90 - 27 = 63W difference at idle.
 



Yours is better
 



Intel also worked on a little project called larrabee, that didn't turn out too well... Just saying, don't base a purchase based on the "promise" of a company's wishes to change drivers. It could take 2 years to get that feature going, by that time, there will totally be new product...