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CROSSFIRE mean having two or more than two graphics card in one pc.
the term "Crossfire" is used for AMD/ati cards for examples,
HD 6950 + HD 6950 = CROSSFIRE which mean it does increase your gaming performance. crossfire work with identical models it doesn't matter with brands, you can use any two different brands whether its MSI+SAPPHIRE, but make sure the models must be same otherwise it will not work. as you can see crossfire in this image.
19823088.jpg
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on the other hand the similar thing is "SLI"
sli is based on NVIDIA cards the purpose of SLI is similar to that of crossfire
for example:
GTX 570 + GTX 570 = SLI and the same story of crossfire.
image of sli,



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power supply depend on models the bigger card, the more wattage power supply with good brand like corsair,cooler master,antec etc.
 


:wahoo: Man... u got a killer machine 😀 😍 😉
 
Let's say I get i5 2500k and 7950 what motherboard would I need?Btw is there any difference between Radeon HD 7950 and Sapphire Radeon HD 7950 3GB OC? because I read some reviews and there are 2 types of 7950?and I want to ask why did you buy gtx 580?You said that 7950>580?
I looked into best gpu http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107.html for XX money and I can't see 7950 🙁 I only saw 7970.
i guess 7970 is better than 7950 if not way better but in my country is more expensive with 200$.
My pick for ram is corsair 1600 ddr3 1600 mhz too 8 definitely(16 is overkill that's what i read)
 
7970 is way better than 7950. 7950 sapphire 3gb OC is factory overclocked, buy this one it should give u a few more fps in games than 7950 without the OC.
 
Is it possible if I buy 7950 sapphire 3gb oc to crossfire it?(2 gpu) that wont be soon but is it possible?
And what motherboard will be the best choice for 7950 sapphire?
 
particularly black caviar hard drives are good, SSDs are good for now it won't increase your performance in games but could "load" all the things very fastly as compared to regular HDD.
So if budget is not an issue then yes it is worth,
the motherboard that i suggest you, yes it works with every graphics card.. It doesn't matter.
 
@Xtreme5 do you think that motherboard http://outmax.bg/dmz/index.php?_a=viewProd&productId=35824 is good? because yours Asus P8Z68-V PRO/GEN3 is 150$ more expensive.I read also and it says that Asus P8Z68-V PRO/GEN3 is good motherboard for overclocking but since I'm new to this I don't think I'll overclock much.You got this motherboard because it's good for overclocking or because it's good overall?and what power supply do I need to run 2500k and 7950? 650-700 watts?
 


Well..I'm not planning on getting nvidia gpu now that I've chosen my gpu 7950..maybe crossfire later
750 PSU will work?and why on one bulgarian site there are 3 same 7950 gpu but 2 of them cost 150$ more? strange :/ so should I go for the cheaper one? which Sunius linked?
 
yeah the sapphire hd 7950 3gb OC is good.
The price difference maybe because of the brands. Asus is a better brand. More over different brands have slight change in memory clock. That's why there is a price difference
 


You could've check, he gave us the websites. It's not available in his country at all (for any price).
 


Oh sry i forgot about the website :)
 
Dunno if they even sell GTX 670..but why would you want GTX over 7950?I read that 7900 series can overclock alot better than gtx ones also the motherboard which sunius gave link to doesnt support SLI and If I get gtx 670(as I said hard to find) I'll have to get more expensive motherboard.But yeah what is the difference between 670 and 7950?