Sony CD-ROM Drive speed?

[Stretched]

I have this Sony Cd ROM here the model # CDU311 serial #5158954 version BB. There is no clear indication of the speed. I can not seem to find a site to help identify it. Anyone out there can give me a headsup on a site to research this? Thanks

 

[pikasub]

It's an 8x ide drive, I found 3 sites that told me the same thing after I punched in the model number on yahoo