https://bugs.winehq.org/show_bug.cgi?id=33364
--- Comment #6 from Henri Verbeet hverbeet@gmail.com --- (In reply to DL from comment #5)
E.g. there is only a entry for CARD_AMD_RADEON_HD7800 which has a pci id of 0x6819 which is the 7850. The 7870, on the other hand, has a pci id of 0x6818.
No, it doesn't work like that. You can't distinguish a 7850 from a 7870 based on the PCI ID. Note that even if you could that wouldn't help though, since e.g. fglrx will report both as "AMD Radeon HD 7800 Series".