Radeon HD 3870 x2 in Mac Pro - HELP!

[Cindori]

Yeah, but you still have the second card running at half speed. : /

 

[Sveetly]

I've heard (I forget where) that 8x is usually only about a 7% decrease over 16x when used in crossfire with a 16x card.

So an 8x isn't half speed.

 

[ungraphic]

I've heard (I forget where) that 8x is usually only about a 7% decrease over 16x when used in crossfire with a 16x card.

So an 8x isn't half speed.

This is true.

 

[Bryy]

The power cable is found here: http://shop.ati.com/product.asp?sku=3280778 (You need two. You might already have one)

Do you honestly need two, because my card only has one input.

 

[Sveetly]

Do you honestly need two, because my card only has one input.

If your card has two, you need two. If you look at my pictures near the beginning, my card has two plugs — a six pin and an 8 pin (which I used a six pin in.)

If your card really only has one plug, then you only need one.