TweakTown posted a review on the Sapphire Radeon HD 5450 512MB GDDR3 Video Card
The release of a new graphics card every month from ATI is almost drawing to a close. Apart from the HD 5450 we have today, we'll see the HD 5570 early next week and between the middle and the end of this month we should see the HD 5830.Sapphire Radeon HD 5450 512MB GDDR3 Video Card Review
It's not like we're going to get much of a break, though, as roll into March and it's time for NVIDIA to hammer us for the next three months with 400 series cards. Once that comes to an end we'll probably start to see refreshes of the top end ATI cards and towards the end of this year we should see another generation of NV cards.