bit-tech published an in-depth review of AMD's ATI Radeon HD 3870, which covers the architecture, DirectX 10.1, single card and CrossFire performance and power consumption A quote from the article:

AMD's ATI Radeon HD 3870 is a great product for the money, but its price point is incredibly important to its long term success. I say this because unfortunately for AMD, there's a certain G92-based graphics card from Nvidia which delivers, in some cases, quite a bit more performance for not much more financial outlay. With that said though, if you're an AMD/ATI fan or are on a budget, the Radeon HD 3870 is by no means a dud -- this and the Radeon HD 2900 XT are like night and day.

It's a great time to be in the market for a new graphics card, because there are treats on both sides of the fence. If it wasn't for the GeForce 8800 GT, the Radeon HD 3870 would be one of the few graphics card worth serious consideration if you want value for money and, as a result of this, it earns a solid recommendation from us.

AMD ATI Radeon HD 3870 & CrossFire Review