LR and SSD, which cache to choose?

Hi all,
I've just bought an SSD as primary bood disc under Windows and, as I have minimized the space taken by the OS, I get around 150GB free for my applications. As LR is quite slow in loading and showing raw files especially in Develop module, I've taken the decision to move its cache into a dir directly on to the SSD.
Now the problem arises when I noticed that LR (v. 3.4.1) uses two different caches:
1) The ACR one located normally in this dir: c:\users\username\local\Adobe\Camera Raw\cache
2) The Preview one located usually in this dir: x:\LR_catalog\catalog_Previews.lrdata
which one is for? and when one or the other are used? And, above all, which one should I move to the SSD to increase dramatically the performance?
Thanks in advance to all who answer me.
My best regards,
gianluca

HI all,
1st of all I wanna say thanks to all of you that answer my questions. They all have been very well prepared and I've learnt a lot from your answers! Thanks
At the end I choose the following config:
onto SSD I put the catalog itself AND the ACR cache and give it a 50 GB of space. It should be enough. The remain space is for the OS.
onto a WDC 10K drive I put the previews cache, and I've made the 1:1 previews of all my catalog (with the "discard my 1.1 previews" set to never). It filled around 150 GB of stuff! On the same HDD I put also the backups of the catalog.
onto a 7200 rpm drive (unfortunately it's a green one! But I have no money left for other drives ) I've left my raw files for around 1TB of stuff.
Performances didn't change that much as most of you correctly predict, but I've seen more responsiveness and I cut the loading of a raw image in Develop module quite a bit (once the cache has been populated!), which was my initial goal. I guess I cannot ask much more to my old Intel Core Duo Due E8600, even if I have 8GB of RAM, and the only thing I might consider to change is my video card from the presente ATI Radeon HD3470 to a newer one, but I'm not sure whether LR supports the CUDA technology of the NVIDIA cards and if it can help in performance.
Anyway the next year I will upgrade to an Ivy Bridge solution as soon as they will be widely available. Probably the problem of performances arises when I bought a 16MP camera which produces files quite bigger than the old 12MP DSRL ...
Thank you all,
gianluca
PS: the LSE works seamlessly in W7 and, even if it's a bit of OT, I can also suggest this link that gives a nice method to move the Users dir in W7 just to save space on these (small!) SSD's 

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