Techgage.com posted a review on the Palit Radeon HD 4870 Sonic Dual Edition

It's no secret that the HD 4870 is one of the best overall GPUs on the market right now, but with so much selection from vendors, it's hard to choose the "best" one. Palit has a definite winner with their Sonic Dual Edition though. It's pre-overclocked, runs cooler than the reference design and carries no cost premium.

Palit Radeon HD 4870 Sonic Dual Edition Review