Hi. Sorry to read of your problems. I am a FF800 user with a Dell laptop and I have had great success, so I know you must be frustrated. There are a lot of threads in this forum about tips for getting your laptop to work with the Fireface units. Have you tried searching here for tips on doing things like disabling the wireless, adjusting the power settings so that you machine in always running in high performance mode and not power saving mode, disabling the screen saver, disabling any bluetooth devices, built in web cams, Ethernet controllers, etc. All of these things can affect your laptop processor's ability to handle continuous streaming audio. There is a whole litany of things that can and should be tried to enable your laptop to work without problems.
There are also two programs that can be downloaded from the Web that can help you track down any offending devices. One is DPC Latency Checker and the other is Resplendence software. These programs can help you track down your laptop issues.
http://www.thesycon.de/deu/latency_check.shtml
http://www.resplendence.com/main
It might be, and likely is, more than just the TI Firewire chipset. I have been able to successfully record on my RME Fireface through a SIIG Express card as well as the built in Ricoh Firewire chip set. My DPC numbers are not as good as you find on a desktop system, but they remain in the yellow, which allows me to handle enough for live Ensemble recording with up to about 8 inputs. I have never needed to record more than that, but I think it would handle more based on the stability and low CPU utilization numbers I am seeing so far if I needed it.
Can you provide us with some more details about exactly what is happening? Does you system work at all or does it just crash? Are you experiencing drop outs and stuttering? What exactly is happening. There are some really knowledgeable users here that will be more than happy to assist. Give us some more details and let us take a shop at trying to help you isolate the problem.
In the end, laptops like you and I have are consumer grade laptops and are not tuned for audio production. There is always the possibility that your laptop is just not destined to work as an audio laptop, but there are lot's of things that can be tried before making that determination.
Hope these suggestions help and give you some things to consider.