Actually it would be located above the 4GB on Vista32. Both Vista32 and XP32 is artificial limited to 4GB. However they both support PAE (36bit).
The issue is with XP32 the artificial limitation is amde so these addreses have to be under the 4GB. On Vista32 it can be over gaining a full 4GB.
But yes, each GFX card on a PCIe port would allocate 512MB and PCI devices 256MB. People with 7950GX2 in SLI would also know they are down to 2GB approx on XP. So its not right in any way...looks like another RHT from Theo.




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