Don't be. £30 for my motherboard.
Yes it only splits into dual 8x PCIE but don't be fooled into thinking that you sacrifice much. Seriously dude, you lose something pitiful like 1000 marks. But when you are in the 16000 mark range that's absolutely nothing and a decent 16x+16x board will run you four times that much.
I wrote a review here in the member reviews. If you need help finding one holler. IIRC I got mine from Ebuyer, best purchase I have ever made EVER with computer parts.
As I say, don't be fooled by all this new fangled stuff. Each time they do it it makes a small difference. Cobbled together? sure, SATA 3 DDR3 full 16x may make a difference but I tell you, not a difference that is justified by the pricing. If you were out to build a new rig? oh hells to the yeah, go for it. But if you want to recycle your hardware the Alive Xfire is absolutely and utterly unbeatable for £30. I mean seriously, £30. That doesn't buy you much these days and you can see the difference clear as day.
Flog that 9800GTX you have faster than a 1800's slave and get another 5770. I mean the results are astounding. My overall score is almost double but the other stats are just ridiculous. How on earth can two cards nearly triple performance?
Deffo Crossfire FTW. I spanked my mate's 280