(Really, I'm wondering: did you just overlook them or is there a reason they are not competitive with the other platforms?)
Looking further though, I see Softlayer does offer GPU for bare metal provisioning . But it is not available in Virtual machines. Also, even for the GPU offering, it doesn't mention the details at all, not even if it is OpenCL or CUDA.
EDIT - nevermind, was looking in the wrong place! Found this: https://www.ibm.com/cloud-computing/bluemix/gpu-computing
also, since this is your domain, what exactly has been happening in lon/ams with networking? SoftLayer used to pride itself with its network, but it feels subpar at best now.
About lon02 we are actually currently going through a migration to new routers and there was some possible impact communicated to customers. Many apologies it didn't go as smoothly as hoped.