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Yes. The partition size is a matter for the filesystem (and PFS handles any size just fine), but low-level block access is a matter for the device driver, as it's at a lower level than the partitions. So for example, if PFS tries to read a block in your second partition at 4GB+10, the scsi.device driver will respond that that's ok, but will actually access block 0+10, which is in your first partition without any warning.
As supadupa says, if the filesystem supports "direct-scsi" mode, it can access up to nearly 8GB. But the problem still happens if you go above that limit, as can happen with 8GB cards, since the direct-scsi limit is actually ~7.87GB. So you need to leave the last ~250MB of an 8GB card unpartitioned just to be safe to use this method.
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