but phisical there are no differences cause nvidia only baked one typ of 550 gpu`s
called GeForce GTX 550 Ti
so the extra 5 stands for oem and not differences in sillicum
Model GeForce GTX 550 Ti
Year March 2011
Code Name GF116
Fab Process 40 nm
Bus PCIe 2.1 x16
Memory 1024 MB
Core Speed 900 MHz
Cores 1
Shader Speed 1800 MHz
Memory (Base) Speed 1026 MHz (not taking GDDR or GDDR5 multiplication into account)
Unified Shaders 192
Texture Mapping Units 32
Render Output Units 24
Bus Type GDDR5
Bus Width 192-bit
Direct X Version 11
OpenGL Version 4.1
Power (Max TDP) 116 Watts
Shader Model 5.0
Bandwidth 98496 MB/sec
Texel Rate 28800 Mtexels/sec
Pixel Rate 21600 Mpixels/sec