Goals from Iliam Ndiaye and Oli McBurnie in each half were enough to sink the Lilywhites, as they once again drew a blank at home.
North End sit 15th, with the Blades top of the table, after the game and this is how we rated them...
9. Alvaro Fernandez - 6
Looked lively in the first half, making good runs down the wing, but without too much coming from them. Got taken off in the second half after getting a knock which certainly did not please the home support. Photo: CameraSport - Rich Linley
10. Troy Parrott - 6
Made a few decent runs and provided a good ball into the box during the first half but still looks like a man void of confidence or natural finishing at the moment. Photo: CameraSport - Rich Linley
11. Emil Riis - 5
Missed a great chance in the first half from close range and did look a threat throughout most of the first half but offered less as the game wore on. Photo: CameraSport - Rich Linley
12. Daniel Johnson - 6
Came on around the hour mark and didn't really get into the game too much, you could see his intent and that he was keen to make an impact but the Blades had already got a foothold. Photo: CameraSport - Rich Linley