TweakTown posted a review on the Sapphire Radeon HD 5750 1GB Video Card

1680 x 1050 users on the other hand should find this model a fantastic option, we're seeing above 30 FPS in our intensive games like Far Cry 2 with our settings at Very High. Future and more intensive games shouldn't have a problem at 1680 x 1050 with settings anywhere from Medium to Very High depending on how well the game is coded.

Really if you don't game above 1680 x 1050, the HD 5770 isn't the best option, with the HD 5750 offering us the number we need in games at max settings - the HD 5770 is going to offer only higher numbers, which won’t impact on your overall game experience that much. The HD 5770 isn't that much faster either that you could turn AA on in your games; performance would just be hit too much.

Sapphire Radeon HD 5750 1GB Video Card Review