2 holes on the side of the cover allow water to flow from the side. 0.4 mm copper columns on the copper base increase the water contact area, enabling the block to transfer heat from the GPU more efficiently. The base is made of T2 copper (99.9% purity), CNC machined and treated with anti-oxidation technology. Surface flatness is less than 0.01 mm, ensuring better contact with the GPU for improved heat absorption. Compatible with GPUs having fan hole distances between 53 mm and 61 mm. Compatible with NVIDIA graphics cards: 6800GT, 6600GT, 7800GT, 7800GTX, 7900GT, 7950GT, 7900GTO, 7900GTX, 8600GTS, 9600GT, 9500GT, 8800GT (G92), 8800GTS (G92), 9800GT, 9800GTX, 9800GTX+, GTS250, GTS450, GTX550, GTX260, GTX260+, GTX275, GTX285, GTX570, GTX580, GTX660, GTX660TI, GTX670, GTX680, GTX560, GTX460, GTX460TI, GTX560TI. Compatible with AMD graphics cards: X1900PRO, X1900XT, X1900XTX, X1950PRO, X1950GT, X1950XT, X1950XTX, 2600XT, 2900XT, HD3850, HD3870, HD4750, HD4770, HD4850, HD4870, HD4890, HD5830, HD5850, HD5870, HD6970, HD6950, HD6870, HD6850, HD6790, HD7870, HD7850, HD7950, HD7970. Application: Processor Model Number: Water cooling block Size: Copper base dimensions (mm): 50 x 50 x 3 mm, Fitting thread: G1/4 inch Color: Transparent Material: Metal Package Contents: 1 x Water cooling block 2 x Compression fittings 4 x Mounting screws Only the above package content is included; other items are not included. Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.