straight out of the box, unlapped, the VenomousX will perform better than the TRUE, unlapped. This is because the base of the VenomousX only has a slight curvature. When you lap them both, they both improve, but the TRUE improves more and ultimately proves to be the better heatsink.
I have both models, lapped, that I'd be willing to sell. I really like the new retention mounting system of the Venomous X, so much that I'm using it with my TRUE Copper. I have a replacement ordered for the VenomousX but it will be next week before I receive it. $90 ea. with a fan, PM me if your interested.