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Radeon HD 3300 is an integrated GPU on the AMD 790GX Chipset which is based on the 55nm, second unified shader architecture, R600.
It's based on the RS780D Core and offers 40 Shader Processing Units, 4 TMUs and 4 ROPs a 32-bit memory interface of either DDR2 or GDDR3. The central unit runs, commonly, at up to 700MHz and the memory clock's operating speed depends on the system RAM's speed.
Radeon HD 3300's performance depends on the users system configuration which will define the operating memory clock's speed and on the desktop manufacturer which decides its central unit's speed.
Therefore, Radeon HD 3300 may offer similar performance to Radeon HD 3450 (700+MHz & GDDR3 - never better due to lesser driver support) or very limited performance (300MHz & DDR2). DirectX 11 games aren't supported.