#11 is my favorite out of all your designs. Can we replace the gray tones with another color, like black? We can experiment with another color as well. I think the gray is too dull.
The HPC in the logo, doesn't feel like High Performance Computer. Not sure why. May be if we made it less "fun" and more "serious" it will look and feel a bit more like the highly scientific / technical.
I like: - the font of HPC, it is serious, business like, solid. - the colors got lively, no grays, etc - the Cloud and the community aspect are well represented
Improvement areas: - the cloud is a little too puffy. can be wider on the horizontal axis (may be by 10-20%) and narrower on the vertical axis - can we give it some contrast? may be the green and the blue can be darker, but have a slight gradient. this may even give the logo a glow. - not sure how this will look but can we use a smaller weight on the cloud and smaller diameter on the dots? May be by 1 point or 2. - the Experiment is very hard to read when the logo is at 100x100. I may need to use this logo down at 57x57. Not sure how to achieve this since the word experiment is challenging at small size due to it's length.