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.