Just forget about pixel pipelines, they are noting.
There is some thing called pixel shader units, TMU (texture mapping units), ROP (render output pipelines) and vertex shader units
The more pixel shader units you have, the more pixel shader operation you have
The more vertex shader units you have, the more vertex shader operation you have
The more TMU you have, the more texture fill-rate you have.
The more ROP, the more pixel fill-rate you have.
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In newer cards there is something called Unified Shaders, and the difference is that Unified Shader can do both pixel shader and vertex shader operations