CREATE TABLE table_74041 ("Model" TEXT, "Launch" TEXT, "Model Number" TEXT, "Code name" TEXT, "Fab  (  nm  ) " FLOAT, "Bus interface" TEXT, "Memory  (  MiB  ) " TEXT, "Core  (  MHz  ) " TEXT, "Memory  (  MHz  ) " TEXT, "Config core 1" TEXT, "Pixel  (  GP /s ) " TEXT, "Texture  (  GT /s ) " TEXT, "Bandwidth  (  GB /s ) " TEXT, "Bus type 2" TEXT, "Bus width  (  bit  ) " FLOAT, "Processing Power GFLOPs" TEXT, "DirectX" TEXT, "OpenGL" TEXT, "TDP  ( Watts )  GPU only" TEXT)

How many texture (gt/s) the card has if the tdp (watts) GPU only is 18?
SELECT COUNT("Texture ( GT /s)") FROM table_74041 WHERE "TDP (Watts) GPU only" = '18'
SELECT COUNT("Texture ( GT /s)") FROM "table_74041" WHERE "TDP (Watts) GPU only" = '18'