How much of the Xbox360 UMA is availible for graphics?

Not really. It all is, or none is, depending on what you're doing and how much you want. Except for the 32 MB reserved for OS. So somewhere between 0 and 480 MB. A racer is likely to have a lot more available for graphics than a complex living-world RPG for example.
 
How much of the Xbox360 UMA is availible for graphics?

Do you memory bandwidth or the memory itself?

I think in terms of memory bandwidth you'll have about 16-20GB/s left for the Xenos and about 450-480MBs of the memory itself.
 
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