Features:2 holes on the side of the cover， the water flows from the side.0.4 mm copper columns on the copper base. The water contact area becomes large， so the block can carry more heat from GPU quickly.The base is made of T2 (purity of 99.9%) CNC cut copper. The surface flatness is less than 0.01 mm. The base can fit the GPU better， so that it can absorb more heat.The copper base is processed with anti-oxidization technology.Specifications:Copper base dimension(mm): 50*50*3Fitting thread: G1/4"Supported tube: 9.5 mm(ID)*12.7 mm(OD) PU tube， or 10 mm(ID)*16 mm(OD) solid tube， or 8 mm(ID)*12 mm(OD) silicon tubeMaterial:Base: CopperCover: Clear acrylicFitting: Brass， Nickel platedCompatibility: Compatible for GPU with fan hole distance of 53 mm- 61 mm. The support list is as follows:Nvidia card: 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.AMD card: 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.Package included:1x Water cooling block2x Compression fittings4x Mounting screws