thank you for the reply but i read somewhere that pcie2.1 will not work with pcie1.0 thats the prob but the also said that pcie 3.0 will work fine so i foing this card http://www.newegg.com/Product/Product.aspx?Item=N82E16814161418
but does anyone know how much % of the preformance i will loose
No, 3.0 has the same compatibility problems. ( also thought it was only 2.1, but no . . .